Seagate CHEETAH 15K5 SCSI ST373207LW User Manual

Product Manual  
Cheetah 15K.5 SCSI  
ST3300655LW  
ST3146855LW  
ST373455LW  
ST3300655LC  
ST3146855LC  
ST373455LC  
100384776  
Rev. J  
May 2010  
Contents  
7.3  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
i
ii  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
List of Figures  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
iii  
1.0  
Seagate Technology support services  
SEAGATE ONLINE SUPPORT and SERVICES  
Available services include:  
Presales & Technical support  
Global Support Services telephone numbers & business hours  
Authorized Service Centers  
For information regarding Warranty Support, visit  
http://www.seagate.com/www/en-us/support/warranty_&_returns_assistance  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
1
   
2.0  
Scope  
This manual describes Seagate® Technology LLC, Cheetah® 15K.5 SCSI disc drives.  
Cheetah 15K.5 SCSI drives support the small computer system interface (SCSI) as described in the ANSI  
SCSI SPI-4 interface specifications to the extent described in this manual. The SCSI Interface Manual (part  
number 100293069) describes general SCSI interface characteristics of this and other families of Seagate  
drives.  
From this point on in this product manual the reference to Cheetah 15K.5 SCSI models is referred to as “the  
drive” unless references to individual models are necessary.  
2
Cheetah 15K.5 SCSI Product Manual, Rev. J  
 
3.0  
Applicable standards and reference documentation  
The drive has been developed as a system peripheral to the highest standards of design and construction. The  
drive depends upon its host equipment to provide adequate power and environment in order to achieve opti-  
mum performance and compliance with applicable industry and governmental regulations. Special attention  
must be given in the areas of safety, power distribution, shielding, audible noise control, and temperature regu-  
lation. In particular, the drive must be securely mounted in order to guarantee the specified performance char-  
acteristics. Mounting by bottom holes must meet the requirements of Section 9.4.  
3.1  
Standards  
The Cheetah 15K.5 SCSI family complies with Seagate standards as noted in the appropriate sections of this  
Manual, the Seagate Parallel SCSI Interface Manual, part number 100293069, and the SCSI Commands Ref-  
erence Manual, part number 100293068.  
The Cheetah 15K.5 SCSI disc drive is a UL recognized component per UL1950, CSA certified to CSA C22.2  
No. 950-95, and VDE or TUV certified to EN60950.  
3.1.1  
Electromagnetic compatibility  
The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to  
use. As such the drive is supplied as a subassembly and is not subject to Subpart B of Part 15 of the FCC  
Rules and Regulations nor the Radio Interference Regulations of the Canadian Department of Communica-  
tions.  
The design characteristics of the drive serve to minimize radiation when installed in an enclosure that provides  
reasonable shielding. As such, the drive is capable of meeting the Class B limits of the FCC Rules and Regula-  
tions of the Canadian Department of Communications when properly packaged. However, it is the user’s  
responsibility to assure that the drive meets the appropriate EMI requirements in their system. Shielded I/O  
cables may be required if the enclosure does not provide adequate shielding. If the I/O cables are external to  
the enclosure, shielded cables should be used, with the shields grounded to the enclosure and to the host con-  
troller.  
3.1.2  
Electromagnetic susceptibility  
As a component assembly, the drive is not required to meet any susceptibility performance requirements. It is  
the responsibility of those integrating the drive within their systems to perform those tests required and design  
their system to ensure that equipment operating in the same system as the drive or external to the system  
does not adversely affect the performance of the drive. See Table 3, DC power requirements.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
3
                                 
3.2  
Electromagnetic compliance  
Seagate uses an independent laboratory to confirm compliance to the directives/standard(s) for CE Marking  
and C-Tick Marking. The drive was tested in a representative system for typical applications. The selected sys-  
tem represents the most popular characteristics for test platforms. The system configurations include:  
• Typical current use microprocessor  
• 3.5-inch floppy disc drive  
• Keyboard  
• Monitor/display  
• Printer  
• External modem  
• Mouse  
Although the test system with this Seagate model complies to the directives/standard(s), we cannot guarantee  
that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compliance  
and provide CE Marking and C-Tick Marking for their product.  
Electromagnetic compliance for the European Union  
If this model has the CE Marking it complies with the European Union requirements of the Electromagnetic  
Compatibility Directive 89/336/EEC of 03 May 1989 as amended by Directive 92/31/EEC of 28 April 1992 and  
Directive 93/68/EEC of 22 July 1993.  
Australian C-Tick  
If this model has the C-Tick Marking it complies with the Australia/New Zealand Standard AS/NZS3548 1995  
and meets the Electromagnetic Compatibility (EMC) Framework requirements of Australia’s Spectrum Man-  
agement Agency (SMA).  
Korean MIC  
If this model has the Korean Ministry of Information and Communication (MIC) logo, it complies with paragraph  
1 of Article 11 of the Electromagnetic Compatibility (EMC) Control Regulation and meets the Electromagnetic  
Compatibility Framework requirements of the Radio Research Laboratory (RRL) Ministry of Information and  
Communication Republic of Korea.  
This drive has been tested and complies with the Electromagnetic Interference/Electromagnetic Susceptibility  
(EMI/EMS) for Class B products.  
Taiwanese BSMI  
If this model has the Chinese National Standard (CNS) 13438 marking, it complies with Chinese National Stan-  
dard (CNS) 13438 and meets the Electromagnetic Compatibility (EMC) Framework requirements of the Tai-  
wanese Bureau of Standards, Metrology, and Inspection (BSMI).  
3.3  
European Union Restriction of Hazardous Substances (RoHS)  
The European Union Restriction of Hazardous Substances (RoHS) Directive restricts the presence of chemical  
substances, including Lead (Pb), in electronic products effective July 2006.  
A number of parts and materials in Seagate products are procured from external suppliers. We rely on the rep-  
resentations of our suppliers regarding the presence of RoHS substances in these parts and materials. Our  
supplier contracts require compliance with our chemical substance restrictions, and our suppliers document  
their compliance with our requirements by providing material content declarations for all parts and materials for  
the disc drives documented in this publication. Current supplier declarations include disclosure of the inclusion  
of any RoHS-regulated substance in such parts or materials.  
4
Cheetah 15K.5 SCSI Product Manual, Rev. J  
             
Seagate also has internal systems in place to ensure ongoing compliance with the RoHS Directive and all laws  
and regulations which restrict chemical content in electronic products. These systems include standard operat-  
ing procedures that ensure that restricted substances are not utilized in our manufacturing operations, labora-  
tory analytical validation testing, and an internal auditing process to ensure that all standard operating  
procedures are complied with.  
3.4  
Reference documents  
Cheetah 15K.5 SCSI Installation Guide  
Safety and Regulatory Agency Specifications  
SCSI Commands Reference Manual  
Parallel SCSI Interface Product Manual  
Seagate P/N 100384777  
Seagate P/N 75789512  
Seagate P/N 100293068  
Seagate P/N 100293069  
Applicable ANSI small computer system interface (SCSI) document numbers:  
T10/1143D  
T10/1416D  
T10/1417D  
T10/1157D  
T10/1365D  
Enhanced SCSI Parallel Interface (EPI)  
Primary Commands-3 (SPC-3)  
SCSI Block Commands (SBC-2)  
SCSI Architectural Model-2 (SAM-2)  
SPI-4 (SCSI Parallel Interface version 4)  
SFF-8451  
Specification for SCA-2 Unshielded Connections  
Seagate P/N 30190-001 (under 100 lb.)  
Seagate P/N 30191-001 (over 100 lb.)  
Package Test Specification  
Package Test Specification  
Specification, Acoustic Test Requirements, and Procedures Seagate P/N 30553-001  
In case of conflict between this document and any referenced document, this document takes precedence.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
5
           
4.0  
General description  
Cheetah 15K.5 SCSI drives combine Tunneling Magnetoresistive (TMR) heads and a wide Ultra320 SCSI  
interface to provide high performance, high capacity data storage for a variety of systems including engineer-  
ing workstations, network servers, mainframes, and supercomputers.  
Ultra320 SCSI uses negotiated transfer rates. These transfer rates will occur only if your host adapter supports  
these data transfer rates and is compatible with the required hardware requirements of the I/O circuit type. This  
drive also operates at SCSI-1 and SCSI-2 data transfer rates for backward compatibility with non-Ultra/Ultra2/  
Ultra160/Ultra320 SCSI host adapters.  
Table 1 lists the features that differentiate the Cheetah 15K.5 SCSI models.  
Table 1:  
Drive model number vs. differentiating features  
Number of  
Number of I/O  
connector pins  
Model number  
active heads  
I/O circuit type [1]  
ST3300655LW  
ST3146855LW  
ST373455LW  
8
4
2
Single-ended (SE) and low voltage  
differential (LVD)  
68  
ST3300655LC  
ST3146855LC  
ST373455LC  
8
4
2
Single-ended (SE) and low voltage  
differential (LVD)  
80  
[1] See Section 10.6 for details and definitions.  
The drive records and recovers data on approximately 70 mm non-removable discs.  
The drive supports the Small Computer System Interface (SCSI) as described in the ANSI SCSI interface  
specifications to the extent described in this manual (volume 1), which defines the product performance char-  
acteristics of the Cheetah 15K.5 SCSI family of drives, the Parallel SCSI Interface Manual, part number  
100293069, and the SCSI Commands Reference Manual, part number 100293068, which describe the gen-  
eral interface characteristics of this and other families of Seagate SCSI drives.  
The drive’s interface supports multiple initiators, disconnect/reconnect, self-configuring host software, and log-  
ical block addressing.  
The head and disc assembly (HDA) is sealed at the factory. Air circulates within the HDA through a non-  
replaceable filter to maintain a contamination-free HDA environment.  
Never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads, media, actu-  
ator, etc.) as this requires special facilities. The drive contains no replaceable parts. Opening the HDA voids  
your warranty.  
Cheetah 15K.5 SCSI drives use a dedicated landing zone at the innermost radius of the media to eliminate the  
possibility of destroying or degrading data by landing in the data zone. The drive automatically goes to the  
landing zone when power is removed.  
6
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                     
An automatic shipping lock prevents potential damage to the heads and discs that results from movement dur-  
ing shipping and handling. The shipping lock automatically disengages when power is applied to the drive and  
the head load process begins.  
A high-performance actuator assembly with a low-inertia, balanced, patented, straight-arm design provides  
excellent performance with minimal power dissipation.  
4.1  
Standard features  
The Cheetah 15K.5 SCSI family has the following standard features:  
• Perpendicular recording technology.  
• Integrated Ultra320 SCSI interface.  
• Multimode SCSI drivers and receivers—single-ended (SE) and low voltage differential (LVD)  
• 16 bit I/O data bus  
• Asynchronous and synchronous data transfer protocol  
• Firmware downloadable via SCSI interface  
• Selectable even byte sector sizes from 512 to 528 bytes/sector  
• Programmable sector reallocation scheme  
• Flawed sector reallocation at format time  
• Programmable auto write and read reallocation  
• Reallocation of defects on command (post format)  
• ECC burst correction length of up to 400.  
• Sealed head and disc assembly  
• No preventative maintenance or adjustment required  
• Dedicated head landing zone  
• Embedded servo design  
• Self diagnostics performed when power is applied to the drive  
• Zoned bit recording (ZBR)  
• Vertical, horizontal, or top down mounting  
• Dynamic spindle brake  
• 16,384 kbytes data buffer  
• Hot plug compatibility (Section 10.6.4.2 lists proper host connector needed) for LC model drives  
• Drive Self Test (DST)  
• Supports SCSI bus fairness  
4.2  
Media characteristics  
The media used on the drive has an aluminum substrate coated with a thin film magnetic material, overcoated  
with a proprietary protective layer for improved durability and environmental protection.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
7
                                 
4.3  
Performance  
• Supports industry standard Ultra320 SCSI interface  
• Programmable multi-segmentable cache buffer (see Section 5.5)  
• 15k RPM spindle. Average latency = 2.0 msec  
• Command queuing of up to 64 commands  
• Background processing of queue  
• Supports start and stop commands (spindle stops spinning)  
4.4  
Reliability  
• Annualized Failure Rate (AFR) of 0.62%  
• Increased LSI circuitry integration  
• Incorporates industry-standard Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.)  
• 5-year warranty  
4.5  
Formatted capacities  
Standard OEM models are formatted to 512 bytes per block. The sector size is selectable at format time. Users  
having the necessary equipment may modify the data block size before issuing a format command and obtain  
different formatted capacities than those listed.  
To provide a stable target capacity environment and at the same time provide users with flexibility if they  
choose, Seagate recommends product planning in one of two modes:  
1. Seagate designs specify capacity points at certain sector sizes that Seagate guarantees current and future  
products will meet. We recommend customers use this capacity in their project planning, as it ensures a  
stable operating point with backward and forward compatibility from generation to generation. The current  
guaranteed operating points for this product are:  
ST3300655LW  
ST3300655LC  
ST3146855LW  
ST3146855LC  
ST373455LW  
ST373455LC  
Sector Size  
512  
Decimal  
Hex  
Decimal  
Hex  
Decimal  
Hex  
585,937,500  
574,712,644  
573,653,847  
570,053,000  
566,007,800  
557,874,778  
22ECB25C  
22416B44  
22314357  
21FA5188  
21BC97F8  
21407E5A  
286,749,488  
282,050,768  
280,790,184  
279,041,740  
275,154,368  
272,662,935  
11177330  
10CFC0D0  
10BC84A8  
10A1D6CC  
106685C0  
10408197h  
143,374,744  
141,025,384  
140,395,092  
139,463,602  
137,577,184  
136,331,467  
88BB998  
867E068  
85E4254  
8500BB2  
83342E0  
82040CBh  
514  
520  
522  
524  
528  
2. Seagate drives also may be used at the maximum available capacity at a given sector size, but the excess  
capacity above the guaranteed level will vary between 10K and 15K families and from generation to gener-  
ation, depending on how each sector size actually formats out for zone frequencies and splits over servo  
bursts. This added capacity potential may range from 0.1 to 1.3 percent above the guaranteed capacities  
listed above. Using the drives in this manner gives the absolute maximum capacity potential, but the user  
must determine if the extra capacity potential is useful, or whether their assurance of backward and for-  
ward compatibility takes precedence.  
8
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                       
4.5.1  
Programmable drive capacity  
Using the Mode Select command, the drive can change its capacity to something less than maximum. See the  
Mode Select Parameter List table in the SCSI Interface Manual. Refer to the Parameter list block descriptor  
number of blocks field. A value of zero in the number of blocks field indicates that the drive shall not change the  
capacity it is currently formatted to have. A number in the number of blocks field that is less than the maximum  
number of LBAs changes the total drive capacity to the value in the block descriptor number of blocks field. A  
value greater than the maximum number of LBAs is rounded down to the maximum capacity.  
4.6  
Factory installed accessories  
OEM Standard drives are shipped with the Cheetah 15K.5 Installation Guide, part number 100384777, and the  
Safety and Regulatory Agency Specifications, part number 75789512 (unless otherwise specified). The factory  
also ships with the drive a small bag of jumper plugs used for the J5 and J6 option select jumper headers (on  
LW models only).  
4.7  
Options (factory installed)  
All customer requested options are incorporated during production or packaged at the manufacturing facility  
before shipping. Some of the options available are (not an exhaustive list of possible options):  
• Other capacities can be ordered depending on sparing scheme and sector size requested.  
• Single unit shipping pack. The drive is normally shipped in bulk packaging to provide maximum protection  
against transit damage. Units shipped individually require additional protection as provided by the single unit  
shipping pack. Users planning single unit distribution should specify this option.  
• The Cheetah 15K.5 Installation Guide, part number 100384777, usually ships with each standard OEM  
drive. Extra copies may be ordered.  
• The Safety and Regulatory Agency Specifications, part number 75789512, usually ships with each standard  
OEM drive. Extra copies may be ordered.  
4.8  
Accessories  
The following accessories are available. All accessories may be installed in the field.  
• Single unit shipping pack.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
9
                     
5.0  
Performance characteristics  
5.1  
Internal drive characteristics (transparent to user)  
ST3300655LW  
ST3300655LC  
ST3146855LW  
ST3146855LC  
ST373455LW  
ST373455LC  
Drive capacity  
300.0  
8
146.8  
4
73.4  
GBytes (formatted)*,**  
Read/write heads  
Tracks/surface (total)  
Tracks/inch  
2
74,340  
125,000  
890k  
74,340  
125,000  
890k  
74,340  
125,000  
890k  
110  
Tracks (user accessible)  
TPI  
Peak bits/inch  
BPI  
Gbits/inch2  
Areal Density  
110  
110  
Internal data rate  
Disc rotational speed  
960 to 1607  
15k  
960 to 1607  
15k  
960 to 1607  
15k  
Mbits/sec (variable with zone)  
rpm  
Average rotational latency 2.0  
2.0  
2.0  
msec  
* One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment  
and formatting.  
** Rounded off value.  
5.2  
SCSI performance characteristics (visible to user)  
The values given in Section 5.2.1 apply to all models of the Cheetah 15K.5 SCSI family unless otherwise spec-  
ified. Refer to the Parallel SCSI Interface Manual for additional timing details.  
10  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                       
5.2.1  
Seek time  
1 2  
,
Not including controller overhead (msec)  
Read  
3.5  
Write  
4.0  
Average  
Typical  
Typical  
Typical  
Single Track  
Full Stroke  
0.2  
0.4  
6.8  
7.5  
1.  
Typical access times are measured under nominal conditions of temperature, volt-  
age, and horizontal orientation as measured on a representative sample of drives.  
Access to data = access time + latency time.  
2.  
5.2.2  
Format command execution time (minutes) [1]  
ST3300655LW  
ST3300655LC  
ST3146855LW  
ST3146855LC  
ST373455LW  
ST373455LC  
Maximum (with verify)  
Maximum (no verify)  
120  
60  
90  
45  
60  
30  
5.2.3  
Generalized performance characteristics  
Sustainable disc transfer rate:  
Minimum [3]  
Maximum [3]  
73  
Mbytes/sec  
Mbytes/sec  
125  
SCSI interface data transfer rate (asynchronous):  
Maximum instantaneous one byte wide  
Maximum instantaneous two bytes wide  
5.0  
MBytes/sec [3]  
10.0  
MBytes/sec [3]  
Synchronous transfer rate  
In low voltage differential (LVD) interface mode 5.0 to 320  
MBytes/sec  
Sector Sizes:  
Default  
512 byte user data blocks  
Variable  
512 to 528 bytes per sector in even number of bytes per sector.  
If n (number of bytes per sector) is odd, then n-1 will be used.  
Read/write consecutive sectors on a track  
Yes  
Flaw reallocation performance impact (for flaws reallocated at format time using  
the spare sectors per sparing zone reallocation scheme)  
Negligible  
Average rotational latency  
2.00 msec  
Notes for Section 5.2.  
[1] Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the  
request for a Status Byte Transfer to the Initiator (excluding connect/disconnect).  
[2] Assumes no errors and no sector has been relocated.  
[3] Assumes system ability to support the rates listed and no cable loss.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
11  
                               
5.3  
Start/stop time  
After DC power at nominal voltage has been applied, the drive becomes ready within 20 seconds if the Motor  
Start Option is disabled (i.e., the motor starts as soon as the power has been applied). If a recoverable error  
condition is detected during the start sequence, the drive executes a recovery procedure which may cause the  
time to become ready to exceed 20 seconds. During spin up to ready time the drive responds to some com-  
mands over the SCSI interface in less than 3 seconds after application of power. Stop time is 30 seconds from  
removal of DC power.  
If the Motor Start Option is enabled, the internal controller accepts the commands listed in the SCSI Interface  
Product Manual less than 3 seconds after DC power has been applied. After the Motor Start Command has  
been received the drive becomes ready for normal operations within 20 seconds typically (excluding an error  
recovery procedure). The Motor Start Command can also be used to command the drive to stop the spindle  
(see the SCSI Commands Reference Manual).  
There is no power control switch on the drive.  
5.4  
Prefetch/multi-segmented cache control  
The drive provides prefetch (read look-ahead) and multi-segmented cache control algorithms that in many  
cases can enhance system performance. “Cache” as used herein refers to the drive buffer storage space when  
it is used in cache operations. To select prefetch and cache features the host sends the Mode Select command  
with the proper values in the applicable bytes in Mode Page 08h (see the SCSI Interface Product Manual).  
Prefetch and cache operation are independent features from the standpoint that each is enabled and disabled  
independently via the Mode Select command. However, in actual operation the prefetch feature overlaps  
cache operation somewhat as is noted in Section 5.5.1 and Section 5.5.2.  
All default cache and prefetch Mode parameter values (Mode Page 08h) for standard OEM versions of this  
drive family are given in Table 10.  
5.5  
Cache operation  
Note. Refer to the SCSI Interface Manual for more detail concerning the cache bits.  
Of the 16 Mbytes physical buffer space in the drive, approximately 13,000 kbytes can be used as a cache. The  
buffer is divided into logical segments from which data is read and to which data is written.  
The drive keeps track of the logical block addresses of the data stored in each segment of the buffer. If the  
cache is enabled (see RCD bit in the SCSI Interface Manual), data requested by the host with a read com-  
mand is retrieved from the buffer, if possible, before any disc access is initiated. If cache operation is not  
enabled, the buffer is still used, but only as circular buffer segments during disc medium read operations (dis-  
regarding Prefetch operation for the moment). That is, the drive does not check in the buffer segments for the  
requested read data, but goes directly to the medium to retrieve it. The retrieved data merely passes through  
some buffer segment on the way to the host. All data transfers to the host are in accordance with buffer-full  
ratio rules. See the explanation provided with the information about Mode Page 02h (disconnect/reconnect  
control) in the SCSI Interface Manual.  
The following is a simplified description of the prefetch/cache operation:  
Case A—read command is received and all of the requested logical blocks are already in the cache:  
1. Drive transfers the requested logical blocks to the initiator.  
Case B—A Read command requests data, and at least one requested logical block is not in any segment of  
the cache:  
1. The drive fetches the requested logical blocks from the disc and transfers them into a segment, and then  
from there to the host in accordance with the Mode Select Disconnect/Reconnect parameters, page 02h.  
2. If the prefetch feature is enabled, refer to section 5.5.2 for operation from this point.  
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Cheetah 15K.5 SCSI Product Manual, Rev. J  
                                                         
Each cache segment is actually a self-contained circular buffer whose length is an integer number of logical  
blocks. The drive dynamically creates and removes segments based on the workload. The wrap-around capa-  
bility of the individual segments greatly enhances the cache’s overall performance.  
Note. The size of each segment is not reported by Mode Sense command page 08h, bytes 14 and 15.  
The value 0XFFFF is always reported regardless of the actual size of the segment. Sending a size  
specification using the Mode Select command (bytes 14 and 15) does not set up a new segment  
size. If the STRICT bit in Mode page 00h (byte 2, bit 1) is set to one, the drive responds as it does  
for any attempt to change an unchangeable parameter.  
5.5.1  
Caching write data  
Write caching is a write operation by the drive that makes use of a drive buffer storage area where the data to  
be written to the medium is stored while the drive performs the Write command.  
If read caching is enabled (RCD=0), then data written to the medium is retained in the cache to be made avail-  
able for future read cache hits. The same buffer space and segmentation is used as set up for read functions.  
The buffer segmentation scheme is set up or changed independently, having nothing to do with the state of  
RCD. When a write command is issued, if RCD=0, the cache is first checked to see if any logical blocks that  
are to be written are already stored in the cache from a previous read or write command. If there are, the  
respective cache segments are cleared. The new data is cached for subsequent Read commands.  
If the number of write data logical blocks exceed the size of the segment being written into, when the end of the  
segment is reached, the data is written into the beginning of the same cache segment, overwriting the data that  
was written there at the beginning of the operation; however, the drive does not overwrite data that has not yet  
been written to the medium.  
If write caching is enabled (WCE=1), then the drive may return Good status on a write command after the data  
has been transferred into the cache, but before the data has been written to the medium. If an error occurs  
while writing the data to the medium, and Good status has already been returned, a deferred error will be gen-  
erated.  
The Synchronize Cache command may be used to force the drive to write all cached write data to the medium.  
Upon completion of a Synchronize Cache command, all data received from previous write commands will have  
been written to the medium.  
Tables 10, 11 and 12 show the mode default settings for the drive.  
5.5.2  
Prefetch operation  
If the Prefetch feature is enabled, data in contiguous logical blocks on the disc immediately beyond that which  
was requested by a Read command are retrieved and stored in the buffer for immediate transfer from the buf-  
fer to the host on subsequent Read commands that request those logical blocks (this is true even if cache  
operation is disabled). Though the prefetch operation uses the buffer as a cache, finding the requested data in  
the buffer is a prefetch hit, not a cache operation hit.  
To enable Prefetch, use Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0  
enables prefetch.  
The drive does not use the Max Prefetch field (bytes 8 and 9) or the Prefetch Ceiling field (bytes 10 and 11).  
When prefetch (read look-ahead) is enabled (enabled by DRA = 0), the drive enables prefetch of contiguous  
blocks from the disc when it senses that a prefetch hit will likely occur. The drive disables prefetch when it  
decides that a prefetch hit is not likely to occur.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
13  
       
6.0  
Reliability specifications  
The following reliability specifications assume correct host/drive operational interface, including all interface  
timings, power supply voltages, environmental requirements and drive mounting constraints (see Section 9.4).  
Less than 10 in 108 seeks  
Seek Errors  
Read Error Rates [1]  
Recovered Data  
Less than 10 errors in 1012 bits transferred (OEM default settings)  
Less than 1 sector in 1016 bits transferred (OEM default settings)  
Less than 1 sector in 1021 bits transferred  
Unrecovered Data  
Miscorrected Data  
Annualized Failure Rate (AFR)  
Preventive Maintenance  
0.62%  
None required  
Note.  
[1] Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.  
6.1  
Error rates  
The error rates stated in this specification assume the following:  
• The drive is operated per this specification using DC power as defined in this manual (see Section 7.2).  
• Errors caused by host system failures are excluded from error rate computations.  
• Assume random data.  
• Default OEM error recovery settings are applied. This includes AWRE, ARRE, full read retries, full write  
retries and full retry time.  
6.1.1  
Recoverable Errors  
Recoverable errors are those detected and corrected by the drive, and do not require user intervention.  
Recoverable Data errors will use correction, although ECC on-the-fly is not considered for purposes of recov-  
ered error specifications.  
Recovered Data error rate is determined using read bits transferred for recoverable errors occurring during a  
read, and using write bits transferred for recoverable errors occurring during a write.  
6.1.2  
Unrecoverable Error  
16  
Unrecoverable Data Errors (Sense Key = 03h) are specified at less than 1 sector in error per 10 bits trans-  
ferred. Unrecoverable Data Errors resulting from the same cause are treated as 1 error for that block.  
14  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                                                   
6.1.3  
Seek errors  
A seek error is defined as a failure of the drive to position the heads to the addressed track. After detecting an  
initial seek error, the drive automatically performs an error recovery process. If the error recovery process fails,  
a seek positioning error (Error code = 15h or 02h) will be reported with a Hardware error (04h) in the Sense  
8
Key. Recoverable seek errors are specified at Less than 10 errors in 10 seeks. Unrecoverable seek errors  
(Sense Key = 04h) are classified as drive failures.  
6.2  
Reliability and service  
You can enhance the reliability of Cheetah 15K.5 SCSI disc drives by ensuring that the drive receives ade-  
quate cooling. Section 7.0 provides temperature measurements and other information that may be used to  
enhance the service life of the drive. Section 9.3 provides recommended air-flow information.  
6.2.1  
Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF)  
These drives shall achieve an AFR of 0.62% (MTBF of 1,400,000 hours) when operated in an environment that  
ensures the HDA case temperatures do not exceed the values specified in Section 7.4.1.  
Operation at case temperatures outside the specifications in Section 7.4.1 may increase the AFR (decrease  
the MTBF). AFR and MTBF statistics are population statistics that are not relevant to individual units.  
AFR and MTBF specifications are based on the following assumptions for Enterprise Storage System environ-  
ments:  
• 8,760 power-on hours per year  
• 250 average on/off cycles per year  
• Operating at nominal voltages  
• System provides adequate cooling to ensure the case temperatures specified in Section 7.4.1 are not  
exceeded.  
6.2.2  
Preventive maintenance  
No routine scheduled preventive maintenance shall be required.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
15  
                   
6.2.3  
Hot plugging Cheetah 15K.5 SCSI disc drives  
The ANSI SPI-4 document defines the physical requirements for removal and insertion of SCSI devices on the  
SCSI bus. Four cases are addressed. The cases are differentiated by the state of the SCSI bus when the  
removal or insertion occurs.  
Case 1 - All bus devices powered off during removal or insertion  
Case 2 - RST signal asserted continuously during removal or insertion  
Case 3 - Current I/O processes not allowed during insertion or removal  
Case 4 - Current I/O process allowed during insertion or removal, except on the device being changed  
Seagate Cheetah 15K.5 SCSI disc drives support all four hot plugging cases. Provision shall be made by the  
system such that a device being inserted makes power and ground connections prior to the connection of any  
device signal contact to the bus. A device being removed shall maintain power and ground connections after  
the disconnection of any device signal contact from the bus (see SFF-8451 Specification for SCA-2 Unshielded  
Connections).  
It is the responsibility of the systems integrator to assure that no hazards from temperature, energy, voltage, or  
ESD potential are presented during the hot connect/disconnect operation.  
All I/O processes for the SCSI device being inserted or removed shall be quiescent. All SCSI devices on the  
bus shall have receivers that conform to the SPI-4 standard.  
If the device being hot plugged uses single-ended (SE) drivers and the bus is currently operating in low voltage  
differential (LVD) mode, then all I/O processes for all devices on the bus must be completed, and the bus qui-  
esced, before attempting to hot plug. Following the insertion of the newly installed device, the SCSI host  
adapter must issue a Bus Reset, followed by a synchronous transfer negotiation. Failure to perform the SCSI  
Bus Reset could result in erroneous bus operations.  
The SCSI bus termination and termination power source shall be external to the device being inserted or  
removed.  
End users should not mix devices with high voltage differential (HVD) drivers and receivers and devices with  
SE, LVD, or multimode drivers and receivers on the same SCSI bus since the common mode voltages in the  
HVD environment may not be controlled to safe levels for SE and LVD devices (see ANSI SPI-4).  
The disc drive spindle must come to a complete stop prior to completely removing the drive from the cabinet  
chassis. Use of the Stop Spindle command or partial withdrawal of the drive, enough to be disconnected from  
the power source, prior to removal are methods for insuring that this requirement is met. During drive insertion,  
care should be taken to avoid exceeding the limits stated in Section 7.4.4, "Shock and vibration" in this manual.  
6.2.4  
S.M.A.R.T.  
S.M.A.R.T. is an acronym for Self-Monitoring Analysis and Reporting Technology. This technology is intended  
to recognize conditions that indicate drive degradation and is designed to provide sufficient warning of a failure  
to allow data back-up before an actual failure occurs.  
Note. The firmware will monitor specific attributes for degradation over time but cannot predict instanta-  
neous drive failures.  
Each attribute monitors a specific set of conditions in the operating performance of the drive, and the thresh-  
olds are optimized to minimize “false” predictions.  
16  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
         
Controlling S.M.A.R.T.  
The operating mode of S.M.A.R.T. is controlled by the DEXCPT bit and the PERF bit of the “Informational  
Exceptions Control Mode Page” (1Ch). The DEXCPT bit is used to enable or disable the S.M.A.R.T. process.  
Setting the DEXCPT bit will disable all S.M.A.R.T. functions. When enabled, S.M.A.R.T. will collect on-line data  
as the drive performs normal read/write operations. When the PERF bit is set, the drive is considered to be in  
“On-line Mode Only” and will not perform off-line functions.  
The process of measuring off-line attributes and saving data can be forced by the Rezero Unit command. Forc-  
ing S.M.A.R.T. will reset the timer so that the next scheduled interrupt will be two hours.  
The drive can be interrogated by the host to determine the time remaining before the next scheduled measure-  
ment and data logging process will occur. This is accomplished by a log sense command to log page 0x3E.  
The purpose is to allow the customer to control when S.M.A.R.T. interruptions occur. As described above, forc-  
ing S.M.A.R.T by the Rezero Unit command will reset the timer.  
Performance impact  
S.M.A.R.T. attribute data will be saved to the disc for the purpose of recreating the events that caused a predic-  
tive failure. The drive will measure and save parameters once every two hours subject to an idle period on the  
SCSI bus. The process of measuring off-line attribute data and saving data to the disc is uninterruptable and  
the maximum delay is summarized below::  
Maximum processing delay  
On-line only delay  
Fully-enabled delay  
DEXCPT = 0, PERF = 1  
DEXCPT = 0, PERF = 0  
42 milliseconds  
S.M.A.R.T. delay times  
163 milliseconds  
Reporting control  
Reporting is controlled in the Informational Exceptions Control Page (1Ch). Subject to the reporting method,  
the firmware will issue a 01-5D00 sense code to the host. The error code is preserved through bus resets and  
power cycles.  
Determining rate  
S.M.A.R.T. monitors the rate at which errors occur and signals a predictive failure if the rate of degraded error  
rate increases to an unacceptable level. To determine rate, error events are logged and compared to the num-  
ber of total operations for a given attribute. The interval defines the number of operations over which to mea-  
sure the rate. The counter that keeps track of the current number of operations is referred to as the Interval  
Counter.  
S.M.A.R.T. measures error rate, hence for each attribute the occurrence of an error is recorded. A counter  
keeps track of the number of errors for the current interval. This counter is referred to as the Failure Counter.  
Error rate is simply the number of errors per operation. The algorithm that S.M.A.R.T. uses to record rates of  
error is to set thresholds for the number of errors and the interval. If the number of errors exceeds the threshold  
before the interval expires, then the error rate is considered to be unacceptable. If the number of errors does  
not exceed the threshold before the interval expires, then the error rate is considered to be acceptable. In  
either case, the interval and failure counters are reset and the process starts over.  
Predictive failures  
S.M.A.R.T. signals predictive failures when the drive is performing unacceptably for a period of time. The firm-  
ware keeps a running count of the number of times the error rate for each attribute is unacceptable. To accom-  
plish this, a counter is incremented whenever the error rate is unacceptable and decremented (not to exceed  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
17  
zero) whenever the error rate is acceptable. This counter is referred to as the Failure History Counter. There is  
a separate Failure History Counter for each attribute. Should the counter continually be incremented such that  
it reaches the predictive threshold, a predictive failure is signaled.  
6.2.5  
Thermal monitor  
Cheetah 15K.5 SCSI drives implement a temperature warning system which:  
1. Signals the host if the temperature exceeds a value which would threaten the drive.  
2. Signals the host if the temperature exceeds a user-specified value.  
3. Saves a S.M.A.R.T. data frame on the drive which exceed the threatening temperature value.  
A temperature sensor monitors the drive temperature and issues a warning over the interface when the tem-  
perature exceeds a set threshold. The temperature is measured at power-up and then at ten-minute intervals  
after power-up.  
The thermal monitor system generates a warning code of 01-0B01 when the temperature exceeds the speci-  
fied limit in compliance with the SCSI standard. The drive temperature is reported in the FRU code field of  
mode sense data. You can use this information to determine if the warning is due to the temperature exceeding  
the drive threatening temperature or the user-specified temperature.  
This feature is controlled by the Enable Warning (EWasc) bit, and the reporting mechanism is controlled by the  
Method of Reporting Informational Exceptions field (MRIE) on the Informational Exceptions Control (IEC)  
mode page (1Ch).  
The current algorithm implements two temperature trip points. The first trip point is set at 68°C which is the  
maximum temperature limit according to the drive specification. The second trip point is user-selectable using  
the Log Select command. The reference temperature parameter in the temperature log page (see Table 2) can  
be used to set this trip point. The default value for this drive is 68°C, however, you can set it to any value in the  
range of 0 to 68°C. If you specify a temperature greater than 68°C in this field, the temperature is rounded  
down to 68°C. A sense code is sent to the host to indicate the rounding of the parameter field.  
Table 2:  
Temperature Log page (0Dh)  
Parameter Code  
Description  
Primary Temperature  
0000h  
0001h  
Reference Temperature  
When the first temperature trip point is exceeded, S.M.A.R.T. data is collected and a frame is saved to the disc.  
6.2.6 Drive Self Test (DST)  
Drive Self Test (DST) is a technology designed to recognize drive fault conditions that qualify the drive as a  
failed unit. DST validates the functionality of the drive at a system level.  
There are two test coverage options implemented in DST:  
1. Extended test  
2. Short text  
The most thorough option is the extended test that performs various tests on the drive and scans every logical  
block address (LBA) of the drive. The short test is time-restricted and limited in length—it does not scan the  
entire media surface, but does some fundamental tests and scans portions of the media.  
If DST encounters an error during either of these tests, it reports a fault condition. If the drive fails the test,  
remove it from service and return it to Seagate for service.  
18  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
           
6.2.6.1  
DST Failure Definition  
The drive will present a “diagnostic failed” condition through the self-tests results value of the diagnostic log  
page if a functional failure is encountered during DST. The channel and servo parameters are not modified to  
test the drive more stringently, and the number of retries are not reduced. All retries and recovery processes  
are enabled during the test. If data is recoverable, no failure condition will be reported regardless of the number  
of retries required to recover the data.  
The following conditions are considered DST failure conditions:  
• Seek error after retries are exhausted  
• Track-follow error after retries are exhausted  
• Read error after retries are exhausted  
• Write error after retries are exhausted  
Recovered errors will not be reported as diagnostic failures.  
6.2.6.2  
Implementation  
This section provides all of the information necessary to implement the DST function on this drive.  
6.2.6.2.1  
State of the drive prior to testing  
The drive must be in a ready state before issuing the Send Diagnostic command. There are multiple reasons  
why a drive may not be ready, some of which are valid conditions, and not errors. For example, a drive may be  
in process of doing a format, or another DST. It is the responsibility of the host application to determine the “not  
ready” cause.  
While not technically part of DST, a Not Ready condition also qualifies the drive to be returned to Seagate as a  
failed drive.  
A Drive Not Ready condition is reported by the drive under the following conditions:  
• Motor will not spin  
• Motor will not lock to speed  
• Servo will not lock on track  
• Drive cannot read configuration tables from the disc  
In these conditions, the drive responds to a Test Unit Ready command with an 02/04/00 or 02/04/03 code.  
6.2.6.2.2  
Invoking DST  
To invoke DST, submit the Send Diagnostic command with the appropriate Function Code (001b for the short  
test or 010b for the extended test) in bytes 1, bits 5, 6, and 7. Refer to the SCSI Commands Reference Manual,  
part number 100293068, for additional information about invoking DST.  
6.2.6.2.3  
Short and extended tests  
DST has two testing options:  
1. short  
2. extended  
These testing options are described in the following two subsections.  
Each test consists of three segments: an electrical test segment, a servo test segment, and a read/verify scan  
segment.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
19  
Short test (Function Code: 001b)  
The purpose of the short test is to provide a time-limited test that tests as much of the drive as possible within  
120 seconds. The short test does not scan the entire media surface, but does some fundamental tests and  
scans portions of the media. A complete read/verify scan is not performed and only factual failures will report a  
fault condition. This option provides a quick confidence test of the drive.  
Extended test (Function Code: 010b)  
The objective of the extended test option is to empirically test critical drive components. For example, the seek  
tests and on-track operations test the positioning mechanism. The read operation tests the read head element  
and the media surface. The write element is tested through read/write/read operations. The integrity of the  
media is checked through a read/verify scan of the media. Motor functionality is tested by default as a part of  
these tests.  
The anticipated length of the Extended test is reported through the Control Mode page.  
6.2.6.2.4  
Log page entries  
When the drive begins DST, it creates a new entry in the Self-test Results Log page. The new entry is created  
by inserting a new self-test parameter block at the beginning of the self-test results log parameter section of the  
log page. Existing data will be moved to make room for the new parameter block. The drive reports 20 param-  
eter blocks in the log page. If there are more than 20 parameter blocks, the least recent parameter block will be  
deleted. The new parameter block will be initialized as follows:  
1. The Function Code field is set to the same value as sent in the DST command  
2. The Self-Test Results Value field is set to Fh  
3. The drive will store the log page to non-volatile memory  
After a self-test is complete or has been aborted, the drive updates the Self-Test Results Value field in its Self-  
Test Results Log page in non-volatile memory. The host may use Log Sense to read the results from up to the  
last 20 self-tests performed by the drive. The self-test results value is a 4-bit field that reports the results of the  
test. If the field is zero, the drive passed with no errors detected by the DST. If the field is not zero, the test  
failed for the reason reported in the field.  
The drive will report the failure condition and LBA (if applicable) in the Self-test Results Log parameter. The  
Sense key, ASC, ASCQ, and FRU are used to report the failure condition.  
6.2.6.2.5  
Abort  
There are several ways to abort a diagnostic. You can use a SCSI Bus Reset or a Bus Device Reset message  
to abort the diagnostic.  
You can abort a DST executing in background mode by using the abort code in the DST Function Code field.  
This will cause a 01 (self-test aborted by the application client) code to appear in the self-test results values  
log. All other abort mechanisms will be reported as a 02 (self-test routine was interrupted by a reset condition).  
6.2.7  
Product warranty  
Beginning on the date of shipment to customer and continuing for a period of five years, Seagate warrants that  
each product (including components and subassemblies) or spare part that fails to function properly under nor-  
mal use due to defect in materials on workmanship or due to nonconformance to the applicable specifications  
will be repaired or replaced, at Seagate’s option and at no charge to customer, if returned by customer at cus-  
tomer’s expense to Seagate’s designated facility in accordance with Seagate’s warranty procedure. Seagate  
will pay for transporting the repair or replacement item to customer. For more detailed warranty information  
refer to the Standard terms and conditions of Purchase for Seagate products.  
20  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
   
Shipping  
When transporting or shipping a drive, a Seagate approved container must be used. Keep your original box.  
They are easily identified by the Seagate-approved package label. Shipping a drive in a non-approved con-  
tainer voids the drive warranty.  
Seagate repair centers may refuse receipt of components improperly packaged or obviously damaged in tran-  
sit. Contact your Authorized Seagate Distributor to purchase additional boxes. Seagate recommends shipping  
by an air-ride carrier experienced in handling computer equipment.  
Product repair and return information  
Seagate customer service centers are the only facilities authorized to service Seagate drives. Seagate does  
not sanction any third-party repair facilities. Any unauthorized repair or tampering with the factory-seal voids  
the warranty.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
21  
   
7.0  
Physical/electrical specifications  
This section provides information relating to the physical and electrical characteristics of the Cheetah 15K.5  
SCSI drive.  
7.1  
AC power requirements  
None.  
7.2  
DC power requirements  
The voltage and current requirements for a single drive are shown in the following table. Values indicated apply  
at the drive power connector. The tables show current values in Amperes.  
Table 3:  
ST3300655LC DC power requirements  
Notes  
LVD mode  
Voltage  
+5 V  
±5%  
0.70  
+12 V  
±5%[2]  
0.80  
Regulation  
[5]  
Average idle current DC  
X
[1][6]  
Maximum starting current  
(peak DC) DC  
[3]  
[3]  
0.76  
1.07  
1.94  
3.35  
3σ  
3σ  
(peak AC) AC  
Delayed motor start (max) DC  
[1][4]  
0.57  
0.03  
3σ  
Peak operating current  
DC  
X
3σ  
3σ  
[1]  
[1]  
0.69  
0.70  
1.38  
1.18  
1.23  
2.90  
Maximum DC  
Maximum (peak) DC  
22  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                         
Table 4:  
ST3146855LC DC power requirements  
Notes  
LVD mode  
Voltage  
+5V  
±5%  
0.71  
+12 V  
±5%[2]  
0.57  
Regulation  
[5]  
Average idle current DC  
X
[1][6]  
Maximum starting current  
(peak DC) DC  
[3]  
[3]  
0.74  
1.04  
1.94  
3.32  
3σ  
3σ  
(peak AC) AC  
Delayed motor start (max) DC  
[1][4]  
0.56  
0.03  
3σ  
Peak operating current  
DC  
X
3σ  
3σ  
[1]  
[1]  
0.67  
0.68  
1.42  
0.88  
0.94  
2.50  
Maximum DC  
Maximum (peak) DC  
Table 5:  
ST373455LC DC power requirements  
Notes  
LVD mode  
Voltage  
+5V  
±5%  
0.69  
+12 V  
±5%[2]  
0.42  
Regulation  
[5]  
Average idle current DC  
X
[1][6]  
Maximum starting current  
(peak DC) DC  
[3]  
[3]  
0.72  
1.00  
1.94  
3.32  
3σ  
3σ  
(peak AC) AC  
Delayed motor start (max) DC  
[1][4]  
0.56  
0.03  
3σ  
Peak operating current  
DC  
X
3σ  
3σ  
[1]  
[1]  
0.67  
0.68  
1.40  
0.78  
0.82  
2.38  
Maximum DC  
Maximum (peak) DC  
[1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks  
will exceed these values. Power supply at nominal voltage. Number of drives tested = 6, 35 Degrees C  
ambient.  
[2] For +12 V, a –10% tolerance is permissible during initial start of spindle, and must return to ±5% before  
15,000 rpm is reached. The ±5% must be maintained after the drive signifies that its power-up sequence  
has been completed and that the drive is able to accept selection by the host initiator.  
[3] See +12 V current profile in Figure 1.  
[4] This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start  
Motor command.  
[5] See Section 7.2.1 “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,  
and transient response.  
[6] During idle, the drive heads are relocated every 60 seconds to a random location within the band from  
three-quarters to maximum track.  
General Notes for Tables 3, 4, and 5:  
1. Minimum current loading for each supply voltage is not less than 1.2% of the maximum operating current  
shown.  
2. The +5 and +12 volt supplies shall employ separate ground returns.  
3. Where power is provided to multiple drives from a common supply, careful consideration for individual  
drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
23  
                                 
starting current must be available to each device.  
4. Parameters, other than spindle start, are measured after a 10-minute warm up.  
5. No terminator power.  
7.2.1  
Conducted noise immunity  
Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz.  
Maximum allowed noise values given below are peak-to-peak measurements and apply at the drive power  
connector.  
+5 V = 250 mV pp from 0 to 100 kHz to 20 MHz.  
+12 V = 800 mV pp from 100 Hz to 8 KHz.  
450 mV pp from 8 KHz to 20 KHz.  
250 mV pp from 20 KHz to 5 MHz.  
7.2.2  
Power sequencing  
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up  
and down. Daisy-chain operation requires that power be supplied to the SCSI bus terminator to ensure proper  
termination of the peripheral I/O cables. To automatically delay motor start based on the target ID (SCSI ID)  
enable the Delay Motor Start option and disable the Enable Motor Start option on the J6 connector on LW mod-  
els or on the backplane for LC models. See Section 9.1 for pin selection information. To delay the motor until  
the drive receives a Start Unit command, enable the Enable Remote Motor Start option on the J6 connector on  
LW models or on the backplane for LC models.  
7.2.3  
Current profile  
Figures 1 and 2 show +5V and +12V sample current profiles for the ST3300655LC model.  
All times and currents are typical. See Table 3 for maximum current requirements.  
24  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                           
Figure 1. Typical ST3300655LW drive +12V LVD current profile  
Figure 2. Typical ST3300655LW drive +5 V LVD current profile  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
25  
     
7.3  
Power dissipation  
ST3300655LW/ST3300655LC  
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 13.1  
watts (44.70 BTUs per hour).  
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure  
3). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5  
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by  
3.4123. )  
ST3300655LC CURRENT/POWER vs THROUGHPUT (SCSI - LVD)  
Random 8 Block Reads  
5Volt A  
1. 8 0 0  
1. 6 0 0  
1. 4 0 0  
1. 2 0 0  
1. 0 0 0  
0.800  
0.600  
0.400  
0.200  
0.000  
18 . 0 0  
16 . 0 0  
14 . 0 0  
12 . 0 0  
10 . 0 0  
8.00  
6.00  
4.00  
2.00  
0.00  
12 V o lt A  
Watts  
0.0  
50.0  
100.0  
150.0  
200.0  
250.0  
300.0  
350.0  
400.0  
I/Os per Second  
Figure 3. ST3300655LC DC current and power vs. IOPS (LVD)  
26  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
     
ST3146855LW/ST3146855LC  
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is  
10.39 watts (35.45 BTUs per hour).  
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure  
4). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5  
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by  
3.4123.  
ST3146855LC CURRENT/POWER vs THROUGHPUT (SCSI - LVD)  
Random 8 Block Reads  
5Volt A  
1. 8 0 0  
1. 6 0 0  
1. 4 0 0  
1. 2 0 0  
1. 0 0 0  
0.800  
0.600  
0.400  
0.200  
0.000  
18 . 0 0  
16 . 0 0  
14 . 0 0  
12 . 0 0  
10 . 0 0  
8.00  
6.00  
4.00  
2.00  
0.00  
12 V o lt A  
Watts  
0.0  
50.0  
100.0  
150.0  
200.0  
250.0  
300.0  
350.0  
400.0  
I/Os per Second  
Figure 4. ST3146855LC DC current and power vs. IOPS (LVD)  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
27  
 
ST373455LW/ST373455LC  
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 8.49  
watts (28.97 BTUs per hour).  
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure  
5). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5  
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by  
3.4123.  
ST373455LC CURRENT/POWER vs THROUGHPUT (SCSI - LVD)  
Random 8 Block Reads  
5Volt A  
1. 8 0 0  
1. 6 0 0  
1. 4 0 0  
1. 2 0 0  
1. 0 0 0  
0.800  
0.600  
0.400  
0.200  
0.000  
18 . 0 0  
16 . 0 0  
14 . 0 0  
12 . 0 0  
10 . 0 0  
8.00  
6.00  
4.00  
2.00  
0.00  
12 Volt A  
Watts  
0.0  
50.0  
100.0  
150.0  
200.0  
250.0  
300.0  
350.0  
400.0  
I/Os per Second  
Figure 5. ST373455LC DC current and power vs. IOPS (LVD)  
28  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
 
7.4  
Environmental limits  
Temperature and humidity values experienced by the drive must be such that condensation does not occur on  
any drive part. Altitude and atmospheric pressure specifications are referenced to a standard day at 58.7°F  
(14.8°C). Maximum wet bulb temperature is 82°F (28°C).  
7.4.1  
Temperature  
a. Operating  
The maximum allowable continuous or sustained HDA case temperature for the rated Annualized Failure  
Rate (AFR) is 122°F (50°C). The maximum allowable HDA case temperature is 60°C. Occasional excur-  
sions of HDA case temperatures above 122°F (50°C) or below 41°F (5°C) may occur without impact to  
specified AFR. Continual or sustained operation at HDA case temperatures outside these limits may  
degrade AFR.  
Provided the HDA case temperatures limits are met, the drive meets all specifications over a 41°F to 131°F  
(5°C to 55°C) drive ambient temperature range with a maximum temperature gradient of 36°F (20°C) per  
hour. Air flow may be needed in the drive enclosure to keep within this range (see Section 8.3). Operation at  
HDA case temperatures outside this range may adversely affect the drives ability to meet specifications. To  
confirm that the required cooling for the electronics and HDA case is provided, place the drive in its final  
mechanical configuration, perform random write/read operations and measure the HDA case temperature  
after it has stabilized.  
b. Non-operating  
–40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This  
specification assumes that the drive is packaged in the shipping container designed by Seagate for use with  
drive.  
HDA Temp.  
Check Point  
1
.0"  
.5"  
Figure 6. Locations of the HDA temperature check point  
7.4.2 Relative humidity  
The values below assume that no condensation on the drive occurs.  
a. Operating  
5% to 95% non-condensing relative humidity with a maximum gradient of 10% per hour.  
b. Non-operating  
5% to 95% non-condensing relative humidity with a maximum gradient of 20% per hour.  
7.4.3  
Effective altitude (sea level)  
a. Operating  
–1,000 to +10,000 feet (–305 to +3,048 meters)  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
29  
                                       
b. Non-operating  
–1,000 to +40,000 feet (–305 to +12,210 meters)  
7.4.4  
Shock and vibration  
Shock and vibration limits specified in this document are measured directly on the drive chassis. If the drive is  
installed in an enclosure to which the stated shock and/or vibration criteria is applied, resonances may occur  
internally to the enclosure resulting in drive movement in excess of the stated limits. If this situation is apparent,  
it may be necessary to modify the enclosure to minimize drive movement.  
The limits of shock and vibration defined within this document are specified with the drive mounted by any of  
the four methods shown in Figure 7, and in accordance with the restrictions of Section 9.4. Orientation of the  
side nearest the LED may be up or down.  
7.4.4.1  
Shock  
a. Operating—normal  
The drive, as installed for normal operation, shall operate error free while subjected to intermittent shock not  
exceeding 15 Gs at a maximum duration of 11 msec (half sinewave). The drive, as installed for normal  
operation, shall operate error free while subjected to intermittent shock not exceeding 60 Gs at a maximum  
duration of 2 msec (half sinewave). Shock may be applied in the X, Y, or Z axis.  
b. Operating—abnormal  
Equipment, as installed for normal operation, does not incur physical damage while subjected to intermit-  
tent shock not exceeding 40 Gs at a maximum duration of 11 msec (half sinewave). Shock occurring at  
abnormal levels may promote degraded operational performance during the abnormal shock period. Speci-  
fied operational performance will continue when normal operating shock levels resume. Shock may be  
applied in the X, Y, or Z axis. Shock is not to be repeated more than two times per second.  
c. Non-operating  
The limits of non-operating shock shall apply to all conditions of handling and transportation. This includes  
both isolated drives and integrated drives.  
The drive subjected to nonrepetitive shock not exceeding 75 Gs at a maximum duration of 11 msec (half  
sinewave) shall not exhibit device damage or performance degradation. Shock may be applied in the X, Y,  
or Z axis.  
The drive subjected to nonrepetitive shock not exceeding 250 Gs at a maximum duration of 2 msec (half  
sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y,  
or Z axis.  
The drive subjected to nonrepetitive shock not exceeding 120 Gs at a maximum duration of 0.5 msec (half  
sinewave) does not exhibit device damage or performance degradation. Shock may be applied in the X, Y,  
or Z axis.  
d. Packaged  
Disc drives shipped as loose load (not palletized) general freight will be packaged to withstand drops from  
heights as defined in the table below. For additional details refer to Seagate specifications 30190-001  
(under 100 lbs/45 kg) or 30191-001 (over 100 lbs/45 Kg).  
Package size  
Packaged/product weight  
Any  
Drop height  
<600 cu in (<9,800 cu cm)  
600-1800 cu in (9,800-19,700 cu cm)  
>1800 cu in (>19,700 cu cm)  
>600 cu in (>9,800 cu cm)  
60 in (1524 mm)  
48 in (1219 mm)  
42 in (1067 mm)  
36 in (914 mm)  
0-20 lb (0 to 9.1 kg)  
0-20 lb (0 to 9.1 kg)  
20-40 lb (9.1 to 18.1 kg)  
30  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                   
Drives packaged in single or multipacks with a gross weight of 20 pounds (8.95 kg) or less by Seagate for  
general freight shipment shall withstand a drop test from 48 inches (1,070 mm) against a concrete floor or  
equivalent.  
Z
X
Y
X
Z
Y
Figure 7. Recommended mounting  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
31  
   
7.4.4.2  
Vibration  
a. Operating—normal  
The drive as installed for normal operation, shall comply with the complete specified performance while  
subjected to continuous vibration not exceeding  
10–500 Hz @ 0.5 G (zero to peak)  
Vibration may be applied in the X, Y, or Z axis.  
Operating normal translational random flat profile:  
10–500 Hz  
0.4 gRMS  
b. Operating—abnormal  
Equipment as installed for normal operation shall not incur physical damage while subjected to periodic  
vibration not exceeding:  
15 minutes of duration at major resonant frequency  
10–500 Hz @ 0.75 G (X, Y, or Z axis, zero to peak)  
Vibration occurring at these levels may degrade operational performance during the abnormal vibration  
period. Specified operational performance will continue when normal operating vibration levels are  
resumed.  
Operating abnormal translational random flat profile  
10 - 500 Hz  
1.2 gRMS  
c. Non-operating  
The limits of non-operating vibration shall apply to all conditions of handling and transportation. This  
includes both isolated drives and integrated drives.  
The drive shall not incur physical damage or degraded performance as a result of continuous vibration not  
exceeding  
5–22 Hz @ 0.040 inches (1.02 mm) displacement (zero to peak)  
22–500 Hz @ 2.00 G (zero to peak)  
Vibration may be applied in the X, Y, or Z axis.  
Non-operating translational random flat profile:  
10–500 Hz  
1.2 gRMS  
7.4.5  
Air cleanliness  
The drive is designed to operate in a typical office environment with minimal environmental control.  
7.4.6  
Corrosive environment  
Seagate electronic drive components pass accelerated corrosion testing equivalent to 10 years exposure to  
light industrial environments containing sulfurous gases, chlorine and nitric oxide, classes G and H per ASTM  
B845. However, this accelerated testing cannot duplicate every potential application environment.  
Users should use caution exposing any electronic components to uncontrolled chemical pollutants and corro-  
sive chemicals as electronic drive component reliability can be affected by the installation environment. The sil-  
ver, copper, nickel and gold films used in Seagate products are especially sensitive to the presence of sulfide,  
chloride, and nitrate contaminants. Sulfur is found to be the most damaging. In addition, electronic components  
should never be exposed to condensing water on the surface of the printed circuit board assembly (PCBA) or  
exposed to an ambient relative humidity greater than 95%. Materials used in cabinet fabrication, such as vulca-  
nized rubber, that can outgas corrosive compounds should be minimized or eliminated. The useful life of any  
electronic equipment may be extended by replacing materials near circuitry with sulfide-free alternatives.  
32  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                       
7.4.7  
Acoustics  
Sound power during idle mode shall be 3.7 bels typical when measured to ISO 7779 specification. Sound  
power while operating shall be 4.3 bels typical when measured to ISO 7779 specification.  
There will not be any discrete tones more than 10 dB above the masking noise on typical drives when mea-  
sured according to Seagate specification 30553-001. There will not be any tones more than 24 dB above the  
masking noise on any drive.  
7.4.8  
Electromagnetic susceptibility  
See Section 3.1.2.  
7.5  
Mechanical specifications  
The following nominal dimensions are exclusive of the decorative front panel accessory. However, dimensions  
of the front panel are shown in figure below. Refer to Figures 8 and 9 for detailed mounting configuration  
dimensions. See Section 9.4, “Drive mounting.”  
Height (max):  
Width (max):  
Depth (max):  
Weight (max):  
1.028 in.  
26.11 mm  
4.010 in.  
101.85 mm  
146.99 mm  
0.839 kilograms  
5.787 in.  
1.85 pounds  
K
S
REF  
//  
T
-Z-  
-Z-  
[1]  
H
L
J
B
Notes:  
[1]  
R REF  
Mounting holes are 6-32 UNC 2B, three  
on each side and four on the bottom.  
Max screw penetration into side of drive  
is 0.15 in. (3.81 mm). Max screw  
tightening torque is 6.0 in-lb (3.32 nm)  
with minimum full thread engagement of  
0.12 in. (3.05 mm).  
A
V
-Z-  
M
C
-X-  
U -X-  
Dimension Table  
Inches  
Millimeters  
P
A
B
C
D
E
F
1.028 max  
5.787 max  
4.000 .010  
3.750 .010  
.125 .010  
1.750 .010  
1.122 .020  
4.000 .010  
.250 .010  
1.638 .010  
.181 .020  
1.625 .020  
1.816  
26.10 max  
147.00 max  
101.60 .25  
95.25 .25  
3.18 .25  
44.45 .25  
28.50 .50  
101.60 .25  
6.35 .25  
41.60 .25  
4.60 .50  
41.28 .50  
46.13  
F
H
J
[1]  
K
L
M
P
R
S
T
.315  
8.00  
.015 max  
0.38 max  
0.38 max  
6.73 .25  
U
V
.015 max  
.265 .010  
E
D
Figure 8. LW mounting configuration dimensions  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
33  
                     
K
REF  
S
-Z-  
// T -Z-  
[1]  
H
L
J
B
Notes:  
R REF  
[1]  
Mounting holes are 6-32 UNC 2B, three  
on each side and four on the bottom.  
Max screw penetration into side of drive  
is 0.15 in. (3.81 mm). Max screw  
tightening torque is 6.0 in-lb (3.32 nm)  
with minimum full thread engagement of  
0.12 in. (3.05 mm).  
N -Z- -X-  
A
-Z-  
M
C
-X-  
Dimension Table  
U -X-  
Inches  
Millimeters  
A
B
C
D
E
F
1.028 max  
5.787 max  
4.000 .010  
3.750 .010  
.125 .010  
1.750 .010  
1.122 .020  
4.000 .010  
.250 .010  
1.638 .010  
.181  
26.10 max  
147.00 max  
101.60 .25  
95.25 .25  
3.18 .25  
44.45 .25  
28.50 .50  
101.60 .25  
6.35 .25  
41.60 .25  
4.60  
P
H
J
K
L
F
[1]  
M
N
P
R
S
T
.040  
1.02  
1.625 .020  
2.618  
41.28 .50  
66.50  
.276  
7.00  
.015 max  
.015 max  
0.38 max  
0.38 max  
U
E
D
Figure 9. LC mounting configuration dimensions  
34  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
   
8.0  
Defect and error management  
Seagate continues to use innovative technologies to manage defects and errors. These technologies are  
designed to increase data integrity, perform drive self-maintenance, and validate proper drive operation.  
SCSI defect and error management involves drive internal defect/error management and SCSI system error  
considerations (errors in communications between the initiator and the drive). In addition, Seagate provides  
the following technologies used to increase data integrity and drive reliability:  
• Background Media Scan (see Section 8.4)  
• Media Pre-Scan (see Section 8.5)  
• Deferred Auto-Reallocation (see Section 8.6)  
• Idle Read After Write (see Section 8.7)  
The read error rates and specified storage capacities are not dependent on host (initiator) defect management  
routines.  
8.1  
Drive internal defects  
During the initial drive format operation at the factory, media defects are identified, tagged as being unusable,  
and their locations recorded on the drive primary defects list (referred to as the “P” list and also as the ETF  
defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place  
on the medium and the location listed in the defects reallocation table. The “P” list is not altered after factory  
formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment  
are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the  
Read Defect Data command (see the SCSI Commands Reference Manual).  
8.2  
Drive error recovery procedures  
Whenever an error occurs during drive operation, the drive, if programmed to do so, performs error recovery  
procedures to attempt to recover the data. The error recovery procedures used depend on the options previ-  
ously set up in the error recovery parameters mode page. Error recovery and defect management may involve  
the use of several SCSI commands, the details of which are described in the SCSI Interface Product Manual.  
The drive implements selectable error recovery time limits such as are required in video applications. For addi-  
tional information on this, refer to the Error Recovery Page table in the SCSI Commands Reference Manual,  
which describes the Mode Select/Mode Sense Error Recovery parameters.  
The error recovery scheme supported by the drive provides a means to control the total error recovery time for  
the entire command in addition to controlling the recovery level for a single LBA. The total amount of time spent  
in error recovery for a command can be limited via the Recovery Time Limit bytes in the Error Recovery Mode  
Page. The total amount of time spent in error recovery for a single LBA can be limited via the Read Retry  
Count or Write Retry Count bytes in the Error Recovery Mode Page.  
The drive firmware error recovery algorithms consist of 11 levels for read recoveries and 5 levels for writes.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
35  
                               
Table 6 equates the Read and Write Retry Count with the maximum possible recovery time for read and write  
recovery of individual LBAs. The times given do not include time taken to perform reallocations, if reallocations  
are performed. Reallocations are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the  
RC bit is zero, and the Recovery Time Limit for the command has not yet been met. Time needed to perform  
reallocation is not counted against the Recovery Time Limit.  
The Read Continuous (RC) bit, when set to one, requests the disc drive to transfer the requested data length  
without adding delays (for retries or ECC correction) that may be required to insure data integrity. The disc  
drive may send erroneous data in order to maintain the continuous flow of data. The RC bit should only be  
used when data integrity is not a concern and speed is of utmost importance. If the Recovery Time Limit or  
retry count is reached during error recovery, the state of the RC bit is examined. If the RC bit is set, the drive  
will transfer the unrecovered data with no error indication and continue to execute the remaining command. If  
the RC bit is not set, the drive will stop data transfer with the last good LBA, and report a “Check Condition,  
Unrecovered Read Error.”  
Table 6:  
Read and write retry count maximum recovery times [1]  
Read retry  
Maximum recovery time per LBA  
(cumulative, msec)  
Write retry Maximum recovery time per LBA  
count  
(cumulative, msec)  
0
51.87  
0
23.94  
1
59.85  
1
35.91  
2
203.49  
219.45  
253.11  
279.35  
311.27  
395.12  
463.12  
495.04  
530.95  
1,282.97  
2
55.86  
3
3
67.83  
4
4
119.79  
5
5 (default)  
147.72  
6
7
8
9
10  
11 (default)  
[1] These values are subject to change.  
Setting these retry counts to a value below the default setting could result in an increased unrecovered  
error rate which may exceed the value given in this product manual. A setting of zero (0) will result in the  
drive not performing error recovery.  
For example, suppose the Read/Write Recovery page has the RC bit set to 0, read retry count set to 4,  
and the recovery time limit field (Mode Sense page 01, bytes 10 and 11) set to FF FF hex (maximum). A  
four LBA Read command is allowed to take up to 253.11 msec recovery time for each of the four LBAs in  
the command. If the recovery time limit is set to 00 C8 hex (200 msec decimal) a four LBA read command  
is allowed to take up to 200 msec for all error recovery within that command. The use of the Recovery  
Time Limit field allows finer granularity on control of the time spent in error recovery. The recovery time  
limit only starts counting when the drive is executing error recovery and it restarts on each command.  
Therefore, each command’s total recovery time is subject to the recovery time limit. Note: A recovery time  
limit of 0 will use the drive’s default value of FF FF. Minimum recovery time limit is achieved by setting the  
Recovery Time Limit field to 00 01.  
36  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
   
8.3  
SCSI systems errors  
Information on the reporting of operational errors or faults across the interface is given in the SCSI Interface  
Product Manual. Message Protocol System is described in the SCSI Interface Product Manual. Several of the  
messages are used in the SCSI systems error management system. The Request Sense command returns  
information to the host about numerous kinds of errors or faults. The Receive Diagnostic Results reports the  
results of diagnostic operations performed by the drive.  
Status returned by the drive to the Initiator is described in the SCSI Commands Reference Manual. Status  
reporting plays a role in the SCSI systems error management and its use in that respect is described in sec-  
tions where the various commands are discussed.  
8.4  
Background Media Scan  
Background Media Scan (BMS) is a self-initiated media scan. BMS is defined in the T10 document SPC-4  
available from the T10 committee. BMS performs sequential reads across the entire pack of the media while  
the drive is idle. In RAID arrays, BMS allows hot spare drives to be scanned for defects prior to being put into  
service by the host system. On regular duty drives, if the host system makes use of the BMS Log Page, it can  
avoid placing data in suspect locations on the media. Unreadable and recovered error sites will be logged or  
reallocated per ARRE/AWRE settings.  
With BMS, the host system can consume less power and system overhead by only checking BMS status and  
results rather than tying up the bus and consuming power in the process of host-initiated media scanning activ-  
ity.  
Since the background scan functions are only done during idle periods, BMS causes a negligible impact to sys-  
tem performance. The first BMS scan for a newly manufactured drive is performed as quickly as possible to  
verify the media and protect data by setting the “Start time after idle” to 5ms, all subsequent scans begin after  
500ms of idle time. Other features that normally use idle time to function will function normally because BMS  
functions for bursts of 800ms and then suspends activity for 100ms to allow other background functions to  
operate.  
BMS interrupts immediately to service host commands from the interface bus while performing reads. BMS will  
complete any BMS-initiated error recovery prior to returning to service host-initiated commands. Overhead  
associated with a return to host-servicing activity from BMS only impacts the first command that interrupted  
BMS, this results in a typical delay of about 1 ms.  
8.5  
Media Pre-Scan  
Media Pre-Scan is a feature that allows the drive to repair media errors that would otherwise have been found  
by the host system during critical data accesses early in the drive’s life. The default setting for Media Pre-Scan  
is enabled on standard products. Media Pre-Scan checks each write command to determine if the destination  
LBAs have been scanned by BMS. If the LBAs have been verified, the drive proceeds with the normal write  
command. If the LBAs have not been verified by BMS, Pre-Scan will convert the write to a write verify to certify  
that the data was properly written to the disc.  
Note. During Pre-Scan write verify commands, write performance may decrease by 50% until Pre-Scan  
completes. Write performance testing should be performed after Pre-Scan is complete. This may  
be checked by reading the BMS status.  
To expedite the scan of the full pack and subsequently exit from the Pre-Scan period, BMS will begin scanning  
immediately when the drive goes to idle during the Pre-Scan period. In the event that the drive is in a high  
transaction traffic environment and is unable to complete a BMS scan within 24 power on hours BMS will dis-  
able Pre-Scan to restore full performance to the system.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
37  
                         
8.6  
Deferred Auto-Reallocation  
Deferred Auto-Reallocation (DAR) simplifies reallocation algorithms at the system level by allowing the drive to  
reallocate unreadable locations on a subsequent write command. Sites are marked for DAR during read oper-  
ations performed by the drive. When a write command is received for an LBA marked for DAR, the auto-reallo-  
cation process is invoked and attempts to rewrite the data to the original location. If a verification of this rewrite  
fails, the sector is re-mapped to a spare location.  
This is in contrast to the system having to use the Reassign Command to reassign a location that was unread-  
able and then generate a write command to rewrite the data. DAR is most effective when AWRE and ARRE  
are enabled—this is the default setting from the Seagate factory. With AWRE and ARRE disabled DAR is  
unable to reallocate the failing location and will report an error sense code indicating that a write command is  
being attempted to a previously failing location.  
8.7  
Idle Read After Write  
Idle Read After Write (IRAW) utilizes idle time to verify the integrity of recently written data. During idle periods,  
no active system requests, the drive reads recently written data from the media and compares it to valid write  
command data resident in the drives data buffer. Any sectors that fail the comparison result in the invocation of  
a rewrite and auto-reallocation process. The process attempts to rewrite the data to the original location. If a  
verification of this rewrite fails, the sector is re-mapped to a spare location.  
38  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
           
9.0  
Installation  
Note. These drives are designed to be used only on single-ended (SE) or low voltage differential (LVD)  
busses. Do not install these drives on a high voltage differential (HVD) bus.  
The first thing to do when installing a drive is to set the drive SCSI ID and set up certain operating options. This  
is usually done by installing small shorting jumpers on the J5 connector (see Figure 10), or via the drive to host  
I/O signals on the LC model. Some users connect cables to J5 and perform the set-up using remote switches.  
Configure drive options  
For option jumper locations and definitions refer to Figures 10 and 11. Drive default mode parameters are not  
normally needed for installation. Refer to Section 10.3.2 for default mode parameters if they are needed.  
• Ensure that the SCSI ID of the drive is not the same as the host adapter. Most host adapters use SCSI ID 7  
because ID 7 is the highest priority on both 8 and 16 bit data buses.  
• If multiple devices are on the bus set the drive SCSI ID to one that is not presently used by other devices on  
the bus.  
• If the drive is the only device on the bus, attach it to the end of the SCSI bus cable. The user, system integra-  
tor, or host equipment manufacturer must provide external terminators.  
Note. For additional information about terminator requirements, refer to Sections 10.8 and 10.9.  
• Set all appropriate option jumpers for desired operation prior to power on. If jumpers are changed after  
power has been applied, recycle the drive power to make the new settings effective.  
• Installation instructions are provided by host system documentation or with any additionally purchased drive  
installation software. If necessary see Section 10 for Seagate support services telephone numbers.  
• Do not remove the manufacturer’s installed labels from the drive and do not cover with additional labels, as  
the manufacturer labels contain information required when servicing the product.  
Formatting  
• Drives are shipped from the factory low level formatted with 512 byte sectors.  
9.1  
Drive ID/option select header  
Figure 10 shows the drive ID select jumper connector. Figure 11 shows the option select jumper connector for  
all models. Figure 11 shows the drive’s J6 jumper connector. The notes following the figures describe the func-  
tions of the various jumper positions on the connectors. Suggested part number for the jumpers used on J6 is  
Molex 52747-0211 (Seagate part number 77679052). A bag with the two jumper plug types is shipped with the  
standard OEM drives.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
39  
                                                       
Drive HDA (rear view, PCB facing downward)  
J5  
Pin 1  
[1] [2]  
Pin 1  
+5V Ground  
4P  
3P 2P  
1P  
[2]  
(default)  
J1-DC Power  
68 Pin  
SCSI I/O Connector  
J1  
SCSI ID = 0  
SCSI ID = 1  
SCSI ID = 2  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
PCB  
SCSI ID = 6  
SCSI ID = 7  
For ID selection use  
jumpers as shown or  
connect a cable for  
remote switching as  
shown below.  
SCSI ID = 8  
SCSI ID = 9  
SCSI ID = 10  
SCSI ID = 11  
SCSI ID = 12  
SCSI ID = 13  
SCSI ID = 14  
SCSI ID = 15  
A
A
A
A
3
2
1
0
Pins 1, 3, 5, and 7 are  
optional connections to  
switching circuits in host  
equipment to establish  
drive ID.  
Reserved  
Host  
N.C.  
Alternate  
Usage Plug  
11  
9
7
5
6
3
4
1
2
A
A
A
A
3
0
1
2
[4]  
Remote Switches  
Pins 2, 4, 6, and 8 are  
normally not grounded.  
They are driven low (ground)  
for 250 ms after a Reset  
or PWR ON to allow drive to  
read SCSI ID selected.  
12 10 8  
+5V  
N.C.  
+5V  
Ground  
Drive Activity LED  
[4]  
Dashed area is optional host circuitry (external to the  
drive) connected to host supplied optional usage plug.  
Figure 10. J5 jumper header (on LW models only)  
40  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
 
Drive  
Front  
Jumper Plug  
(enlarged to  
show detail)  
Pin 1  
Reserved  
[1] [5]  
J6  
T
P
D
P
D
M
E
W S  
P E  
S
Term. Power to SCSI Bus  
Parity Disable  
Delay Motor Start  
Enable Remote Motor Start  
Write Protect  
Force Single-ended Bus Mode  
Figure 11. J6 option select header (on LW models only)  
9.1.1 Notes for Figures 10 and 11.  
[1] Notes explaining the functions of the various jumpers on J5 and J6 jumper header connectors are given  
here and in Section 9.1.2. The term “default” means as standard OEM units are configured with a jumper  
on those positions when shipped from factory. “Off” means no jumper is installed; “On” means a jumper is  
installed. OFF or ON underlined is factory default condition.  
The PCBA on LC models does not have connector J5 or J6. The J5 connector signals conform to SFF-  
8009 Revision 2.0, Unitized Connector for Cabled Drives, signal assignments for auxiliary connectors.  
[2] These signals are also on 80-pin J1 I/O connector. See tables 19 and 20, note 9.  
[3] Voltage supplied by the drive.  
[4] Dashed area is optional host circuitry (external to the drive) connected to host supplied optional usage  
plug.  
[5] Do not connect anything to J5 pins 9, 11-12 or J6 pins 13-20.  
[6] Connect an external Drive Activity LED to J5 pin 8 (see Figure 10) and the drive’s +5V power source,  
through an appropriately sized current limiting resistor.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
41  
           
9.1.2  
Function description  
J6  
jumper  
installation  
Jumper function description  
SE  
On  
Off  
Forces drive to use single-ended I/O drivers/receivers only.  
Drive can operate on the interface in low voltage differential mode or single-ended, depend-  
ing on the voltage state of the I/O “DIFFSNS” line. Default is SE jumper not installed.  
DS  
Off  
Off  
On  
ME  
Off  
On  
Off  
Spindle starts immediately after power up - Default setting.  
Drive spindle does not start until Start Unit command received from host.  
Spindle Startup is delayed by SCSI ID times 12 seconds after power is applied, i.e., drive 0  
spindle starts immediately when DC power connected, drive 1 starts after 12 second delay,  
drive 2 starts after 24 second delay, etc.  
On  
On  
Drive spindle starts when Start Unit command received from host. Delayed start feature is  
overridden and does not apply when ME jumper is installed.  
WP  
On  
Off  
Entire drive is write protected.  
Drive is not write protected. Default is WP jumper not installed.  
PD  
On  
Off  
Parity checking and parity error reporting by the drive is disabled.  
Drive checks for parity and reports result of parity checking to host.  
Default is PD jumper not installed.  
RES  
Off  
Reserved jumper position. Default is no RES jumper installed.  
TP  
Off  
The drive does not supply terminator power to external terminators or to the SCSI bus I/O  
cable.  
On  
Drive supplies power to SCSI bus I/O cable. When drives have differential I/O circuits, a  
jumper on the TP position may be needed to power external terminators (see system docu-  
mentation). These drives do not have terminator circuits on the drive.  
Note. J6 does not exist on the LC model and is supported on the LW model only.  
42  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                                           
9.2  
Drive orientation  
The balanced rotary arm actuator design of the drive allows it to be mounted in any orientation. All drive perfor-  
mance characterization, however, has been done with the drive in horizontal (discs level) and vertical (drive on  
its side) orientations, and these are the two preferred mounting orientations.  
9.3  
Cooling  
The host enclosure must provide heat removal from the drive. You should confirm that the host enclosure is  
designed to ensure that the drive operates within the temperature measurement guidelines described in Sec-  
tion 7.4.1. In some cases, forced airflow may be required to keep temperatures at or below the temperatures  
If forced air is necessary, possible air-flow patterns are shown in Figure 12. The air-flow patterns are created  
by fans either forcing or drawing air as shown in the illustrations. Conduction, convection, or other forced air-  
flow patterns are acceptable as long as the temperature measurement guidelines of Section 7.4.1 are met.  
Above unit  
Under unit  
Note. Air flows in the direction shown (back to front)  
or in reverse direction (front to back)  
Above unit  
Under unit  
Note. Air flows in the direction shown or  
in reverse direction (side to side)  
Figure 12. Air flow (suggested)  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
43  
                     
9.4  
Drive mounting  
When mounting the drive using the bottom holes (x-y plane in Figure 7) care must be taken to ensure that the  
drive is not physically distorted due to a stiff non-flat mounting surface. The allowable mounting surface  
stiffness is 80 lb/in (14.0 N/mm). The following equation and paragraph define the allowable mounting surface  
stiffness:  
k * x = F < 15lb = 67N  
where ‘k’ represents the mounting surface stiffness (units of lb/in or N/mm), and ‘x’ represents the out-of-plane  
mounting surface distortion (units of inches or millimeters). The out-of-plane distortion (‘x’) is determined by  
defining a plane with three of the four mounting points fixed and evaluating the out-of-plane deflection of the  
fourth mounting point when a known force (F) is applied to the fourth point.  
Note. Before mounting the drive in any kind of 3.5-inch to 5.25-inch adapter frame, verify with Seagate  
Technology that the drive can meet the shock and vibration specifications while mounted in such an  
adapter frame. Adapter frames that are available may not have a mechanical structure capable of  
mounting the drive so that it can meet the shock and vibration specifications listed in this manual.  
9.5  
Grounding  
Signal ground (PCBA) and HDA ground are connected together in the drive and cannot be separated by the  
user. The equipment in which the drive is mounted is connected directly to the HDA and PCBA with no electri-  
cally isolating shock mounts. If it is desired for the system chassis to not be connected to the HDA/PCBA  
ground, the systems integrator or user must provide a nonconductive (electrically isolating) method of mount-  
ing the drive in the host equipment.  
Increased radiated emissions may result if you do not provide the maximum surface area ground connection  
between system ground and drive ground. This is the system designer’s and integrator’s responsibility.  
44  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                                 
10.0  
Interface requirements  
This section partially describes the interface requirements as implemented on the drives.  
10.1  
General description  
This section describes in essentially general terms the interface requirements supported by the Cheetah 15K.5  
SCSI. No attempt is made to describe all of the minute details of conditions and constraints that must be con-  
sidered by designers when designing a system in which this family of drives can properly operate. Seagate  
declares that the drives operate in accordance with the appropriate ANSI Standards referenced in various  
places herein, with exceptions as noted herein or in the Seagate Parallel SCSI Interface Manual and the SCSI  
Commands Reference Manual.  
10.2  
SCSI interface messages supported  
Table 7 lists the messages supported by the Cheetah 15K.5 SCSI family drives.  
Table 7:  
SCSI messages supported by Cheetah 15K.5 SCSI family drives  
Supported  
(Y = yes)  
(N = no)  
Message name  
Message code  
06h  
Abort  
Y
Y
Y
N
Y
Y
N
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
N
Y
Y
Abort-tag  
0Dh  
Bus device reset  
Clear ACA  
0Ch  
16h  
Clear queue  
0Eh  
Command complete  
Continue I/O process  
Disconnect  
00h  
12h  
04h  
Extended messages  
Identify  
80h-FFh  
23h  
Ignore wide residue (two bytes)  
Initiate recovery  
0Fh  
Initiator detected error  
Linked command complete  
Linked command complete with flag  
Message parity error  
Message reject  
05h  
0Ah  
0Bh  
09h  
07h  
Modify data pointer  
No operation  
08h  
Parallel Protocol Request  
Queue tag messages (two bytes)  
ACA  
[1] [2]  
24h  
21h  
N
Y
Head of queue tag  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
45  
         
Table 7:  
SCSI messages supported by Cheetah 15K.5 SCSI family drives  
Supported  
(Y = yes)  
(N = no)  
Message name  
Message code  
Ordered queue tag  
22h  
20h  
55h  
10h  
03h  
02h  
Y
Y
Y
N
Y
Y
Y
N
N
Y
Simple queue tag  
Quick Arbitration and Selection (QAS)  
Release recovery  
Restore pointers  
Save data pointer  
Synchronous data transfer req.  
Target transfer disable  
Terminate I/O process  
Wide data transfer request  
Notes.  
13h  
11h  
[1] Extended messages (see the SCSI Interface Product Manual).  
[2] Supports all options except qas_req and iu_req.  
10.3  
SCSI interface commands supported  
Table 8 following lists the SCSI interface commands that are supported by the drive.  
OEM standard drives are shipped set to operate in Ultra320 mode.  
Table 8:  
Commands supported by Cheetah 15K.5 SCSI family drive  
Command name  
Command code  
Supported by SCSI-2/3  
Change Definition  
40h  
39h  
18h  
3Ah  
04h  
N
N
N
N
Y
N
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Compare  
Copy  
Copy and Verify  
Format Unit [1]  
DPRY bit supported  
DCRT bit supported  
STPF bit supported  
IP bit supported  
DSP bit supported  
IMMED bit supported  
VS (vendor specific)  
Inquiry  
12h  
Date Code page (C1h)  
Device Behavior page (C3h)  
Firmware Numbers page (C0h)  
Implemented Operating Def page (81h)  
Jumper Settings page (C2h)  
Supported Vital Product Data page (00h)  
Unit Serial Number page (80h)  
46  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
           
Table 8:  
Commands supported by Cheetah 15K.5 SCSI family drive (Continued)  
Command name  
Command code  
Supported by SCSI-2/3  
Lock-unlock cache  
36h  
4Ch  
N
Y
Log Select  
PCR bit  
Y
DU bit  
N
Y
DS bit  
TSD bit  
Y
ETC bit  
N
N
N
Y
TMC bit  
LP bit  
Log Sense  
4Dh  
Application Client Log page (0Fh)  
Background Medium Scan page (15h)  
Buffer Over-run/Under-run page (01h)  
Cache Statistics page (37h)  
Factory Log page (3Eh)  
Y
Y
N
Y
Y
Last n Deferred Errors or Asynchronous Events page (0Bh)  
Last n Error Events page (07h)  
Non-medium Error page (06h)  
Pages Supported list (00h)  
Read Error Counter page (03h)  
Read Reverse Error Counter page (04h)  
Self-test Results page (10h)  
Start-stop Cycle Counter page (0Eh)  
Temperature page (0Dh)  
Verify Error Counter page (05h)  
Write error counter page (02h)  
Mode Select (same pages as Mode Sense 1Ah)  
Mode Select (10) (same pages as Mode Sense 1Ah)  
Mode Sense  
N
N
Y
Y
Y
N
Y
Y
Y
Y
Y
15h  
55h  
1Ah  
Y
Y
Caching Parameters page (08h)  
Control Mode page (0Ah)  
Disconnect/Reconnect (02h)  
Error Recovery page (01h)  
Format page (03h)  
Y
Y
Y
Y
Information Exceptions Control page (1Ch)  
Background Scan mode subpage (01h)  
Notch and Partition Page (0Ch)  
Port Control Page (19h)  
Power Condition page (1Ah)  
Y
Y
N
Y
Y
Cheetah 15K.5 SCSI Product Manual, Rev. J  
47  
Table 8:  
Commands supported by Cheetah 15K.5 SCSI family drive (Continued)  
Command name  
Command code  
Supported by SCSI-2/3  
Rigid Disc Drive Geometry page (04h)  
Unit Attention page (00h)  
Verify Error Recovery page (07h)  
Xor Control page (10h)  
Mode Sense (10) (same pages as Mode Sense 1Ah)  
Prefetch  
Y
Y
Y
N
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
Y
N
Y
N
N
N
Y
Y
Y
Y
5Ah  
34h  
08h  
3Ch  
25h  
37h  
B7h  
28h  
Read  
Read Buffer (modes 0, 2, 3, Ah and Bh supported)  
Read Capacity  
Read Defect Data (10)  
Read Defect Data (12)  
Read Extended  
DPO bit supported  
FUA bit supported  
Read Long  
3Eh  
07h  
1Ch  
Reassign Blocks  
Receive Diagnostic Results  
Supported Diagnostics pages (00h)  
Translate page (40h)  
Release  
17h  
57h  
03h  
Release (10)  
Request Sense  
Actual Retry Count bytes  
Extended Sense  
Field Pointer bytes  
Reserve  
16h  
56h  
3rd Party Reserve  
Extent Reservation  
Reserve (10)  
3rd Party Reserve  
Extent Reservation  
Rezero Unit  
01h  
31h  
30h  
32h  
0Bh  
2Bh  
1Dh  
Search Data Equal  
Search Data High  
Search Data Low  
Seek  
Seek Extended  
Send Diagnostics  
Supported Diagnostics pages (00h)  
48  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
Table 8:  
Commands supported by Cheetah 15K.5 SCSI family drive (Continued)  
Command name  
Command code  
Supported by SCSI-2/3  
Translate page (40h)  
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Set Limits  
33h  
1Bh  
35h  
00h  
2Fh  
Start Unit/Stop Unit (spindle ceases rotating)  
Synchronize Cache  
Test Unit Ready  
Verify  
BYTCHK bit  
Write  
0Ah  
2Eh  
Write and Verify  
DPO bit  
Write Buffer (modes 0, 2, supported)  
3Bh  
2Ah  
Firmware Download option  
(modes 5, 7, Ah and Bh supported) [3]  
Write Extended  
DPO bit  
Y
Y
Y
Y
Y
N
N
N
N
N
FUA bit  
Write Long  
Write Same  
PBdata  
3Fh  
41h  
LBdata  
XDRead  
XDWrite  
52h  
50h  
51h  
XPWrite  
[1] The drive can format to any even number of bytes per sector from 512 to 528.  
[2] Tables 10 show how individual bits are set and which are changeable by the host.  
[3] WARNING: A power loss during flash programming can result in firmware corruption. This usually makes  
the drive inoperable.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
49  
         
Table 9 lists the Standard Inquiry command data that the drive should return to the initiator per the format given  
in the SCSI Interface Product Manual, part number 100293069, Inquiry command section.  
Table 9:  
Cheetah 15K.5 SCSI family drive Standard Inquiry data  
Bytes  
Data (HEX)  
0-15  
00  
53  
R#  
00  
00  
00  
00  
00  
54  
R#  
00  
00  
00  
43  
[y]  
69  
[03]1 [12]2 8B  
00  
01  
3E  
53  
45  
41  
47  
20  
S#  
00  
00  
00  
28  
20  
72  
41  
20  
00  
00  
00  
00  
63  
41  
76  
54  
20  
00  
00  
00  
00  
29  
6C  
65  
45  
20  
00  
00  
00  
00  
20  
6C  
64  
20  
20  
00  
00  
00  
00  
[y]  
20  
20  
VENDOR ID  
3
16-31  
32-47  
48-63  
64-79  
80-95  
96-111  
[33]  
R#  
00  
[33]  
R#  
00  
00  
00  
70  
20  
68  
[30] [30] [36] [35]  
[35] [4C] [57]  
PRODUCT ID  
S#  
00  
00  
00  
79  
53  
74  
S#  
00  
00  
00  
72  
65  
73  
S#  
00  
00  
00  
69  
61  
20  
S#  
00  
00  
00  
67  
67  
72  
S#  
00  
00  
00  
68  
61  
65  
S#  
00  
00  
00  
74  
74  
73  
S#  
00  
00  
00  
20  
65  
65  
00  
00  
6F  
[y]4  
67  
COPYRIGHT  
NOTICE  
112-127 [y]  
128-143 72  
1
[ ] 03 means SCSI-3 (Ultra160) implemented.  
Note. Seagate has chosen to set this bit to 03, SCSI-3 (Ultra160) implemented, rather than 04, SCSI-4  
(Ultra320) implemented, due to compatibility issues with some host bus adapters. This setting will  
not affect the Ultra320 functionality of the drive.  
[ ]2 The drive can be changed between these two configurations:  
02 means response data in SCSI-2/SCSI-3 format.  
12 means the drive uses the hierarchical addressing mode to assign LUNs to logical units (default is 12).  
R# Four ASCII digits representing the last four digits of the product Firmware Release number. This informa-  
tion is also given in the Vital Product Data page C0h, together with servo RAM and ROM release num-  
bers.  
S# Eight ASCII digits representing the eight digits of the product serial number.  
3
[ ] Bytes 18 through 26 reflect model of drive. The table above shows the hex values for Model  
ST3300655LW. Refer to the values below for the values of bytes 18 through 26 of you particular model:  
ST3300655LW  
ST3300655LC  
ST3146855LW  
ST3146855LC  
ST373455LW  
ST373455LC  
33 33 30 30 36 35 35 4C 57  
33 33 30 30 36 35 35 4C 43  
33 31 35 36 38 35 35 4C 57  
33 31 35 36 38 35 35 4C 43  
33 37 33 34 35 35 4C 57 20  
33 37 33 34 35 35 4C 43 20  
[ ]4 Copyright Year - the year the drive’s firmware code was built.  
10.3.1 Inquiry Vital Product data  
Instead of the standard Inquiry data shown in Table 9, the initiator can request several Vital Product Data  
pages by setting the Inquiry command EVPD bit to one. The SCSI Commands Reference Manual lists the Vital  
Product Data pages and describes their formats. A separate Inquiry command must be sent to the drive for  
each Vital Product Data page the initiator wants the drive to send back.  
50  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
             
10.3.2  
Mode Sense data  
The Mode Sense command provides a means for the drive to report its operating parameters to the initiator.  
The drive maintains four sets of Mode parameters, Default values, Saved values, Current values and Change-  
able values.  
Default values are hard coded in the drive firmware that is stored in flash EPROM nonvolatile memory on the  
drive PCBA. Default values can be changed only by downloading a complete set of new firmware into the flash  
EPROM. An initiator can request and receive from the drive a list of default values and use those in a Mode  
Select command to set up new current and saved values, where the values are changeable.  
Saved values are stored on the disc media using a Mode Select command. Only parameter values that are  
allowed to be changed can be changed by this method. See “Changeable values” defined below. Parameters  
in the saved values list that are not changeable by the Mode Select command get their values from the default  
values storage. Current values are volatile values currently being used by the drive to control its operation. A  
Mode Select command can be used to change these values (only those that are changeable). Originally, they  
are installed from saved or default values after a power on reset, hard reset, or Bus Device Reset message.  
Changeable values form a bit mask, stored in nonvolatile memory, that dictates which of the current values and  
saved values can be changed by a Mode Select command. A “one” allows a change to a corresponding bit; a  
“zero” allows no change. For example, in Table 10 refer to Mode page 01, in the row entitled “CHG”. These are  
hex numbers representing the changeable values for mode page 01. Note that bytes 04, 05, 06, and 07 are not  
changeable, because those fields are all zeros. If some changeable code had a hex value EF, that equates to  
the binary pattern 1110 1111. If there is a zero in any bit position in the field, it means that bit is not changeable.  
Bits 7, 6, 5, 3, 2, 1, and 0 are changeable, because those bits are all ones. Bit 4 is not changeable.  
Though the drive always reports non-zero values in bytes 00 and 01, those particular bytes are never change-  
able.  
The Changeable values list can only be changed by downloading new firmware into the flash EPROM.  
On standard OEM drives the Saved values are taken from the default values list and stored into the saved val-  
ues storage location on the media prior to shipping. When a drive is powered up, it takes saved values from the  
media and stores them to the current values storage in volatile memory. It is not possible to change the current  
values (or the saved values) with a Mode Select command before the drive is up to speed and is “ready.” An  
attempt to do so results in a “Check Condition status being returned.  
Note. Because there may be several different versions of drive control firmware in the total population of  
drives in the field, the Mode Sense values given in the following tables may not exactly match those  
of some drives.  
The following tables list the values of the data bytes returned by the drive in response to the Mode Sense com-  
mand pages for SCSI Ultra160 implementation (see the SCSI Commands Reference Manual).  
Definitions:  
SAV = Current saved value.  
DEF = Default value. Standard drives are shipped configured this way.  
CHG= Changeable bits; indicates if current and saved values are changeable.  
Note. Saved values for OEM drives are normally the same as the default values.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
51  
                                                 
Table 10:  
ST3300655 Mode sense data  
MODE SENSE HEADER DATA  
ab 00 10 08 22 ec b2 5c 00 00 02 00  
MODE SENSE PAGES DATA  
SAV 81 0a c0 0b ff 00 00 00 05 00 ff ff  
DEF 81 0a c0 0b ff 00 00 00 05 00 ff ff  
CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff  
SAV 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00  
DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00  
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 87 00 00 00  
SAV 83 16 68 58 00 00 00 38 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00  
DEF 83 16 68 58 00 00 00 38 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00  
CHG 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
SAV 84 16 01 22 64 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00  
DEF 84 16 01 22 64 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00  
CHG 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
SAV 87 0a 00 0b ff 00 00 00 00 00 ff ff  
DEF 87 0a 00 0b ff 00 00 00 00 00 ff ff  
CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff  
SAV 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00  
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00  
CHG 88 12 a5 00 00 00 ff ff ff ff 00 00 20 00 00 00 00 00 00 00  
SAV 8a 0a 02 00 00 00 00 00 00 00 0f 0c  
DEF 8a 0a 02 00 00 00 00 00 00 00 0f 0c  
CHG 8a 0a 03 f0 00 00 00 00 00 00 00 00  
SAV 19 06 01 00 ff ff 00 00  
DEF 19 06 01 00 ff ff 00 00  
CHG 19 06 00 00 ff ff 00 00  
SAV 9a 0a 00 02 00 00 00 0a 00 00 00 04  
DEF 9a 0a 00 02 00 00 00 05 00 00 00 04  
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00  
SAV 9c 0a 10 00 00 00 00 00 00 00 00 01  
DEF 9c 0a 10 00 00 00 00 00 00 00 00 01  
CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff  
SAV 80 06 00 00 0f 00 00 00  
DEF 80 06 00 00 0f 00 00 00  
CHG 80 06 f7 40 0f 00 00 00  
READ CAPACITY DATA  
22 ec b2 5b 00 00 02 00  
52  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
Table 11:  
ST3146855 Mode sense data  
MODE SENSE HEADER DATA  
ab 00 10 08 11 17 73 30 00 00 02 00  
MODE SENSE PAGES DATA  
SAV 81 0a c0 0b ff 00 00 00 05 00 ff ff  
DEF 81 0a c0 0b ff 00 00 00 05 00 ff ff  
CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff  
SAV 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00  
DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00  
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 87 00 00 00  
SAV 83 16 34 2c 00 00 00 1c 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00  
DEF 83 16 34 2c 00 00 00 1c 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00  
CHG 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
SAV 84 16 01 22 64 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00  
DEF 84 16 01 22 64 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00  
CHG 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
SAV 87 0a 00 0b ff 00 00 00 00 00 ff ff  
DEF 87 0a 00 0b ff 00 00 00 00 00 ff ff  
CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff  
SAV 88 12 10 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00  
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00  
CHG 88 12 a5 00 00 00 ff ff ff ff 00 00 20 00 00 00 00 00 00 00  
SAV 8a 0a 02 00 00 00 00 00 00 00 05 57  
DEF 8a 0a 02 00 00 00 00 00 00 00 05 57  
CHG 8a 0a 03 f0 00 00 00 00 00 00 00 00  
SAV 19 06 01 00 ff ff 00 00  
DEF 19 06 01 00 ff ff 00 00  
CHG 19 06 00 00 ff ff 00 00  
SAV 9a 0a 00 02 00 00 00 0a 00 00 00 04  
DEF 9a 0a 00 02 00 00 00 05 00 00 00 04  
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00  
SAV 9c 0a 10 00 00 00 00 00 00 00 00 01  
DEF 9c 0a 10 00 00 00 00 00 00 00 00 01  
CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff  
SAV 80 06 00 00 0f 00 00 00  
DEF 80 06 00 00 0f 00 00 00  
CHG 80 06 f7 40 0f 00 00 00  
READ CAPACITY DATA  
11 17 73 2f 00 00 02 00  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
53  
 
Table 12:  
ST373455 Mode sense data  
MODE SENSE HEADER DATA  
ab 00 10 08 08 8b b9 98 00 00 02 00  
MODE SENSE PAGES DATA  
SAV 81 0a c0 0b ff 00 00 00 05 00 ff ff  
DEF 81 0a c0 0b ff 00 00 00 05 00 ff ff  
CHG 81 0a ff ff 00 00 00 00 ff 00 ff ff  
SAV 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00  
DEF 82 0e 80 80 00 0a 00 00 00 00 00 00 00 00 00 00  
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 87 00 00 00  
SAV 83 16 1a 16 00 00 00 0e 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00  
DEF 83 16 1a 16 00 00 00 0e 00 00 03 da 02 00 00 01 00 e6 00 aa 40 00 00 00  
CHG 83 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
SAV 84 16 01 22 64 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00  
DEF 84 16 01 22 64 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00  
CHG 84 16 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
SAV 87 0a 00 0b ff 00 00 00 00 00 ff ff  
DEF 87 0a 00 0b ff 00 00 00 00 00 ff ff  
CHG 87 0a 0f ff 00 00 00 00 00 00 ff ff  
SAV 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00  
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00  
CHG 88 12 a5 00 00 00 ff ff ff ff 00 00 20 00 00 00 00 00 00 00  
SAV 8a 0a 02 00 00 00 00 00 00 00 02 d1  
DEF 8a 0a 02 00 00 00 00 00 00 00 02 d1  
CHG 8a 0a 03 f0 00 00 00 00 00 00 00 00  
SAV 19 06 01 00 ff ff 00 00  
DEF 19 06 01 00 ff ff 00 00  
CHG 19 06 00 00 ff ff 00 00  
SAV 9a 0a 00 02 00 00 00 0a 00 00 00 04  
DEF 9a 0a 00 02 00 00 00 05 00 00 00 04  
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00  
SAV 9c 0a 10 00 00 00 00 00 00 00 00 01  
DEF 9c 0a 10 00 00 00 00 00 00 00 00 01  
CHG 9c 0a 9d 0f ff ff ff ff ff ff ff ff  
SAV 80 06 00 00 0f 00 00 00  
DEF 80 06 00 00 0f 00 00 00  
CHG 80 06 f7 40 0f 00 00 00  
READ CAPACITY DATA  
08 8b b9 97 00 00 02 00  
54  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
 
10.4  
SCSI bus conditions and miscellaneous features supported  
Asynchronous SCSI bus conditions supported by the drive are listed below. These conditions cause the SCSI  
device to perform certain actions and can alter the SCSI bus phase sequence. Other miscellaneous operating  
features supported are also listed here. Refer to the Parallel SCSI Interface Manual and the SCSI Commands  
Reference Manual for details.  
Table 13:  
SCSI bus conditions and other miscellaneous features  
Condition/feature supported by:  
Supported  
Conditions or feature  
Y
Y
Y
N
Y
N
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
N
Adaptive Caching  
Arbitrating System  
Asynchronous Data Transfer  
Asynchronous Event Notification  
Attention Condition  
Auto Contingent Allegiance Condition  
Contingent Allegiance Condition  
Deferred Error Handling  
Disconnect/Reconnect  
High voltage differential (HVD) interface available  
Low voltage differential (LVD) interface available  
Parameter Rounding (controlled by the Round bit in Mode Select page 0)  
Queue tagging (up to 64 Queue tags supported)  
Reporting actual retry count in Extended Sense bytes 15, 16 and 17.  
Reset Condition  
Segmented Caching  
Synchronous Data Transfer  
Zero Latency Read  
Supported  
Status  
Y
Y
Y
Y
Y
Y
Y
Y
N
Good  
Check Condition  
Condition Met/Good  
Busy  
Intermediate/Good  
Intermediate/Condition Met/Good  
Reservation Conflict  
Queue Full  
ACA Active  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
55  
       
10.5  
Synchronous data transfer  
The data transfer period to be used by the drive and the initiator is established by an exchange of messages  
during the Message Phase of operation. See the section on message protocol in the Parallel SCSI Interface  
Manual and SCSI Commands Reference Manual.  
10.5.1  
Synchronous data transfer periods supported  
In the following tables, M is the synchronous period value (in the transfer rate negotiation message) that repre-  
sents the associated transfer period and transfer rate values.  
Table 14 lists the synchronous data transfer periods supported by the drive in DT DATA phase. DT DATA  
phase is only allowed when using the LVD interface.  
Table 14:  
Synchronous DT DATA transfer periods  
Transfer period  
(nanoseconds)  
Transfer rate  
(megatransfers/second)  
Transfer rate  
(MBytes/second) on wide bus  
M (decimal)  
8
9
10  
12  
25  
6.25  
12.5  
25  
50  
100  
160.0  
80.0  
40.0  
20.0  
10.0  
320.0  
160.0  
80.0  
40.0  
20.0  
Table 15 lists the synchronous data transfer periods supported by the drive in ST DATA phase. ST DATA phase  
is allowed with either LVD or SE interface except as noted.  
Table 15:  
Synchronous ST DATA transfer periods  
Transfer period  
(nanoseconds)  
Transfer rate  
(megatransfers/second)  
M (decimal)  
1
10  
12  
25  
50  
25  
50  
100  
200  
40.0  
20.0  
10.0  
5.0  
1. This transfer rate is only allowed when using the LVD interface.  
10.5.2 REQ/ACK offset  
Cheetah 15K.5 SCSI family drives support REQ/ACK offset values from 7 to 63 (3Fh). Offsets of 1 through 6  
are negotiated to 0 (asynchronous transfer).  
10.6  
Physical interface  
This section describes the connectors, cables, signals, terminators and bus timing of the DC and SCSI I/O  
interface. See Section 10.8 and Section 10.9 for additional terminator information.  
Figures 13 and 14 show the locations of the DC power connector, SCSI interface connector, drive select head-  
ers, and option select headers.  
Details of the physical, electrical and logical characteristics are given in sections following, while the SCSI  
operational aspects of Seagate drive interfaces are given in the Parallel SCSI Interface Manual.  
56  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                                       
10.6.1  
DC cable and connector  
LW model drives receive DC power through a 4-pin connector (see Figure 15 for pin assignment) mounted at  
the rear of the main PCBA. Recommended part numbers of the mating connector are listed below, but equiva-  
lent parts may be used.  
Type of cable  
Connector  
Contacts (20-14 AWG)  
AMP 60619-4 (Loose Piece)  
AMP 61117-4 (Strip)  
14 AWG  
MP 1-480424-0  
LC model drives receive power through the 80-pin I/O connector. See Tables 19 and 20.  
Pin  
1P  
2P  
3P  
4P  
Power  
+12V  
+12V ret  
+ 5V ret  
+ 5V  
J1  
Pin 1  
J5  
Pin 1A  
J1-DC Power  
4P 3P 2P 1P  
PCB  
J1-DC Power  
J5  
Pin 1A  
Pin 1P  
J1  
Pin 1  
68 Pin  
SCSI I/O  
Connector  
Figure 13. LW model drive physical interface (68-pin J1 SCSI I/O connector)  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
57  
               
80-pin  
SCSI I/O  
Connector  
Pin 1  
J6  
Figure 14. LC model drive physical interface (80-pin J1 SCSI I/O connector)  
10.6.2 SCSI interface physical description  
Cheetah 15K.5 SCSI drives support the physical interface requirements of the Ultra320 SCSI Parallel Inter-  
face-4 (SPI-4), and operate compatibly at the interface with devices that support earlier SCSI-2 and SCSI-3  
standards. It should be noted that this is only true if the systems engineering has been correctly done, and if  
earlier SCSI-2 and SCSI-3 devices respond in an acceptable manner (per applicable SCSI Standards) to reject  
newer Ultra320 protocol extensions that they don’t support.  
The drives documented in this manual support single-ended and low voltage differential physical interconnects  
(hereafter referred to as SE and LVD, respectively) as described in the corresponding ANSI SPI document ref-  
erenced in the preceding paragraph. These drives implement driver and receiver circuits that can operate  
either SE or LVD. However, they cannot switch dynamically between SE and LVD operation.  
The drives typically operate on a bus with other SCSI devices. All devices on the bus must operate in the same  
mode, either SE or LVD, but not a mixture of these. All signals on the bus are common between all devices on  
the bus. This bus must be terminated at both ends with the proper impedance in order to operate correctly. Do  
not terminate intermediate SCSI devices. In some cases, the SCSI devices at each end have onboard termina-  
tion circuits that can be enabled by installation of a jumper plug (TE) on the device. These termination circuits  
receive power from either a source internal to the device, or from a line in the interface cable specifically pow-  
ered for that purpose. LC and LW model drives do not have onboard termination circuits. Some type of external  
termination circuits must be provided for these drives by the end user or designers of the equipment into which  
the drives will be integrated. See the ANSI T10 Standard referenced above for the maximum number of  
devices that can successfully operate at various interface transfer rates on SE and LVD buses.  
LC model drives plug into PCBA or bulkhead connectors in the host. They may be connected in a daisy chain  
by the host backplane wiring or PCBA circuit runs that have adequate DC current carrying capacity to support  
the number of drives plugged into the PCBA or bulkhead connectors. A single 80-pin I/O connector cable can-  
not support the DC current needs of several drives, so no cables beyond the bulkhead connectors should be  
used. A single drive connected via a cable to a host 80-pin I/O connector is not recommended.  
58  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                         
Table 16 shows the interface transfer rates supported by the various drive models defined in this manual.  
Table 16:  
Interface transfer rates supported  
Maximum transfer rate  
Interface type/  
drive models  
Fast-20  
(Ultra)  
Fast-40  
(Ultra2)  
Fast-80  
(Ultra160)  
Fast-160  
(Ultra320)  
Fast-5  
Fast-10  
Asynchronous  
SE  
ST3300655LW/LC  
ST3146855LW/LC  
ST373455LW/LC  
yes  
yes  
yes  
yes  
yes  
no  
no  
no  
LVD ST3300655LW/LC  
ST3146855LW/LC  
yes  
yes  
yes  
yes  
yes  
yes  
ST373455LW/LC  
10.6.3  
SCSI interface cable requirements  
The characteristics of cables used to connect parallel interface drives are discussed in the ANSI standards ref-  
erenced in this section.  
10.6.3.1  
Cable requirements  
The characteristics of cables used to connect Ultra320 SCSI parallel interface devices are discussed in detail  
in Section 6 of ANSI Standard T10/1365D Rev. 3. The cable characteristics that must be considered when  
interconnecting the drives described in this manual in a Ultra320 SCSI parallel, daisy-chain interconnected  
system are:  
• characteristic impedance (see T10/1365D Sections 6.3.3 and 6.3.4)  
• propagation delay (see T10/1365D Sections 6.3.6 and 6.3.7)  
• stub length (see T10/1365D Section 6.9)  
• device spacing (see T10/1365D Section 6.9)  
To minimize discontinuances and signal reflections, cables of different impedances should not be used in the  
same bus. Implementations may require trade-offs in shielding effectiveness, cable length, number of loads  
and spacing, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded  
cables are mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered.  
Proper impedance matching is especially important in order to maintain adequate margin at FAST-20, FAST-  
40, FAST-80, and FAST-160 SCSI transfer rates.  
Note. For LVD operation, twisted pair cables are recommended. For LVD Fast-40 operation, twisted pair  
cables are strongly recommended. For Fast-80 and Fast-160 operation, twisted pair cables are  
required.  
LC Models  
The 80-pin connector option provided on LC models is intended for use on drives that plug directly into back-  
plane connector in the host equipment. In such installations, all backplane wiring segments are subject to the  
electromagnetic concepts presented in Standard T10/1365D, Rev. 3, Section 6. For LC model drives, installa-  
tions with connectors on cables are not recommended.  
10.6.4  
Mating connectors  
Part numbers for the different type connectors that mate with the various Cheetah 15K.5 SCSI I/O connectors  
are given in the sections following.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
59  
           
10.6.4.1  
Mating connectors for LW model drives  
The nonshielded cable connector shall be a 68 conductor connector consisting of two rows of 34 male contacts  
with adjacent contacts 0.050 inch (1.27 mm) apart.  
Recommended mating flat cable connector part numbers are:  
Amp Model 786096-7  
Amp Model 786090-7  
Amp Model 749925-5  
Female, 68-pin, panel mount  
Female, 68-pin, cable mount  
(50 mil conductor centers, 28 or 30 AWG wire)  
Use two, 34 conductor, 50 mil center flat cable with this connector.  
This type connector can only be used on cable ends. [1]  
Amp Model 88-5870-294-5 W/O Strain Relief (25 mil conductor centers, 30 AWG wire).  
Use either on cable ends or in cable middle section for daisy-chain  
installations [1].  
Amp Model 1-480420-0  
Berg 69307-012  
Power connector 4 circuit housing  
12-position, 2 x 6, 2 mm receptacle housing  
[1] See Figure 15.  
The drive device connector is a nonshielded 68 conductor connector consisting of two rows of 34 female pins  
with adjacent pins 50 mils apart. The connector is keyed by means of its shape (see Figure 16).  
10.6.4.2  
Mating connectors for LC model drives  
The nonshielded connector shall be an 80-conductor connector consisting of two rows of 40 contacts with adja-  
cent contacts 50 (1.27 mm) mils apart (see Figure 17). I/O connection using a cable is not recommended. The  
length and size of the host equipment DC power carrying conductors from the DC power source to the host  
equipment 80-pin disc drive interface connector(s) should be strictly designed according to proper power trans-  
mission design concepts. No possibility for the equipment user to attach an 80-pin cable/connector should be  
allowed, since the length of the DC power carrying conductors could not be controlled and therefore could  
become too long for safe power transmission to the drive. Multiconnector 80-conductor cables should espe-  
cially not be allowed, since the power-carrying conductors on the 80-conductor interface were not intended to  
support a series of drives.  
To insure that both drive connector and host equipment mating connector mate properly, both drive connector  
and host equipment mating connector must meet the provisions of “SFF-8451 Specification for SCA-2  
60  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                                 
Recommended mating 80-position PCBA mount connectors:  
Straight-in connector Hot plug version (with ground guide-pin)  
Seagate P/N:  
Amp US P/N:  
or  
Amp US P/N:  
or  
77678703  
2-557103-1  
94-0680-02-1  
2-557103-2  
94-0680-02-2  
787311-1  
787311-2  
with polarization  
without polarization  
Amp Japan P/N: 5-175475-9  
Right-angle to PCBA connectors  
Seagate P/N: 77678559  
Amp US P/N: 2-557101-1  
Amp Japan P/N: 5-175474-9  
For additional information call Amp FAX service at 1-800-522-6752.  
“LW” Model  
Drive  
Terminator  
[7]  
[6]  
2 through X  
SCSI devices [4]  
SCSI ID 7 [5]  
Pin 1  
SCSI ID 1  
(check your  
adapter for Pin 1 location)  
[1]  
Host  
Adapter  
PCB  
SCSI ID 0  
[3]  
[2]  
[1] Closed end type 68-pin connector used. Terminators enabled.  
[2] Open end type (in-line application) connector used.  
[3] Host need not be on the end of the daisy-chain. Another device can be on the end with the terminator, the  
host having no terminator.  
[4] Total interface cable length must not exceed that specified in ANSI document T10/1365D (including host  
adapter/initiator). The cable length restriction limits the total number of devices allowed.  
[5] SCSI ID7 has highest arbitration priority, then ID15 to ID8 (ID 8 has the very lowest priority).  
[6] Last drive on the daisy chain.  
[7] Open-end type 68-pin connector used. If end device, use external terminator and closed-end type 68-pin  
connector.  
Figure 15. SCSI daisy-chain interface cabling for LW drives  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
61  
                   
3.650–.005  
.346  
.270  
.15 5  
1.650  
.3937  
.0787  
.020  
.600  
.200  
.050  
.022  
.047  
.60  
(15.24)  
.519  
.20  
typ  
(13.18)  
(5.08)  
.100  
(2.54)  
Pos.  
1
1.816  
(46.13)  
.315  
(8.00)  
.085  
(2.16)  
Pos.  
1
Position 1  
Pos. 35  
x 45¡ chamfer  
typ  
3
4
2
1
.315 – .010  
(8.00)  
.050  
(1.27)  
+.001  
.218  
(5.54)  
.840 – .005  
(21.34)  
dia  
.083  
(2.1)  
—.002  
1.650  
(41.91)  
.0787  
(2.00)  
Pos.  
2
Trifurcated Pins  
(4 places)  
Pos. 68  
.980  
(24.89)  
1.368  
(37.74)  
.767  
(19.48)  
3.650  
(92.71)  
Figure 16. Nonshielded 68-pin SCSI device connector used on LW drives  
62  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
 
7.00  
(.276)  
12.70  
(.500)  
End View  
Grounding  
Pins  
2.15 +/- 0.10  
2 places  
57.87 +/- 0.2  
(2.278 +/- .008)  
0.15  
M Y M  
(.0059)  
C
L
of Datum Y  
–Y–  
Front View  
Pin 1  
62.15 +/- 0.15  
(2.447 +/- 0.006)  
0.15  
M Y M  
(.0059)  
Insert mating  
I/O connector  
Housing  
X
Top View  
1.27  
(.05)  
Typ  
X
Contact  
0.50  
Grounding  
Pins  
(.020)  
0.3  
C
L
of Datum Y  
M Y M  
(.012)  
Pin 40  
Pin 1  
Back View  
Pin 41  
Pin 80  
Figure 17. Nonshielded 80-pin SCSI SCA-2 connector used on LC drives  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
63  
 
Table 17:  
LW 68-conductor single-ended (SE) P cable signal/pin assignments [11]  
Note. A minus sign preceding a signal name indicates that signal is active low.  
Connector  
contact  
number [3]  
Connector  
contact  
number [3]  
Signal  
name [1]  
Cable conductor  
number [2]  
Signal  
name [1]  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
TermPwr  
TermPwr  
Reserved  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
GND  
1
1
2
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
–DB12  
–DB13  
–DB14  
–DB15  
–DBP1  
–DB0  
–DB1  
–DB2  
–DB3  
–DB4  
–DB5  
–DB6  
–DB7  
–DBP  
GND  
2
3
4
3
5
6
4
7
8
5
9
10  
12  
14  
16  
18  
20  
22  
24  
26  
28  
30  
32  
34  
36  
38  
40  
42  
44  
46  
48  
50  
52  
54  
56  
58  
60  
62  
64  
66  
68  
6
11  
13  
15  
17  
19  
21  
23  
25  
27  
29  
31  
33  
35  
37  
39  
41  
43  
45  
47  
49  
51  
53  
55  
57  
59  
61  
63  
65  
67  
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
GND  
TermPwr  
TermPwr  
Reserved  
GND  
–ATN  
GND  
–BSY  
–ACK  
–RST  
–MSG  
–SEL  
–C/D  
–REQ  
–I/O  
–DB8  
–DB9  
–DB10  
–DB11  
Notes [ ]: See page following Table 20.  
64  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
 
Table 18:  
LW 68-conductor LVD P cable signal/pin assignments [11]  
Note. A minus sign preceding a signal name indicates that signal is active low.  
Connector  
contact  
number [3]  
Connector  
contact  
number [3]  
Signal  
name [1]  
Cable conductor  
number [2]  
Signal  
name [1]  
+DB12  
+DB13  
+DB14  
+DB15  
+DBP1  
+DB0  
1
1
2
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
–DB12  
–DB13  
–DB14  
–DB15  
–DBP1  
–DB0  
2
3
4
3
5
6
4
7
8
5
9
10  
12  
14  
16  
18  
20  
22  
24  
26  
28  
30  
32  
34  
36  
38  
40  
42  
44  
46  
48  
50  
52  
54  
56  
58  
60  
62  
64  
66  
68  
6
11  
13  
15  
17  
19  
21  
23  
25  
27  
29  
31  
33  
35  
37  
39  
41  
43  
45  
47  
49  
51  
53  
55  
57  
59  
61  
63  
65  
67  
+DB1  
7
–DB1  
+DB2  
8
–DB2  
+DB3  
9
–DB3  
+DB4  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
–DB4  
+DB5  
–DB5  
+DB6  
–DB6  
+DB7  
–DB7  
+DBP  
–DBP  
Ground  
Ground  
TermPwr  
TermPwr  
Reserved  
Ground  
–ATN  
Ground  
DIFFSNS [8]  
TermPwr  
TermPwr  
Reserved  
Ground  
+ATN  
Ground  
+BSY  
Ground  
–BSY  
+ACK  
–ACK  
–RST  
+RST  
+MSG  
+SEL  
–MSG  
–SEL  
+C/D  
–C/D  
+REQ  
+I/O  
–REQ  
–I/O  
+DB8  
–DB8  
+DB9  
–DB9  
+DB10  
+DB11  
–DB10  
–DB11  
Notes [ ]: See page following Table 20.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
65  
 
Table 19:  
LC 80-pin single-ended (SE) I/O connector pin assignments [11]  
Note. A minus sign preceding a signal name indicates that signal is active low.  
Connector  
Signal  
name [1]  
contact  
number [3]  
Signal  
number [3]  
Contact  
name[1]  
12 V CHARGE  
12 V  
1
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
12 V GND  
2
12 V GND  
12 V  
3
12 V GND  
12 V  
4
MATED 1 [12]  
–DB11  
–DB10  
–DB9  
5
6
DIFFSNS [8]  
7
GND  
8
GND  
9
GND  
–DB8  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
GND  
–I/O  
GND  
–REQ  
GND  
–C/D  
GND  
–SEL  
GND  
–MSG  
GND  
–RST  
GND  
–ACK  
GND  
–BSY  
GND  
–ATN  
GND  
–DBP  
GND  
–DB7  
GND  
–DB6  
GND  
–DB5  
GND  
–DB4  
GND  
–DB3  
GND  
–DB2  
GND  
–DB1  
GND  
–DB0  
GND  
–DP1  
GND  
–DB15  
–DB14  
–DB13  
–DB12  
+5 V  
GND  
GND  
GND  
GND  
MATED 2  
+5 V  
5 V GND  
+5 V  
5 V GND  
RMT-START [5] [9] [12]  
SCSI ID (0) [7] [9] [12]  
SCSI ID (2) [7] [9] [12]  
ACTIVE LED OUT [4] [9]  
DLYD-START [6] [9] [12]  
SCSI ID (1) [7] [9] [12]  
SCSI ID (3) [7] [9] [12]  
Notes [ ]: See page following Table 20.  
66  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
   
Table 20:  
LC 80-pin single-ended (LVD) I/O connector pin assignments [11]  
Note. A minus sign preceding a signal name indicates that signal is active low.  
Signal  
name [1]  
Connector contact  
number [3]  
Signal  
number [3]  
Contact  
name[1]  
12 V CHARGE  
12 V  
1
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
12 V GND  
12 V GND  
12 V GND  
MATED 1 [12]  
2
12 V  
3
12 V  
4
–DB11  
5
6
DIFFSNS [8]  
+DB11  
7
–DB10  
8
+DB10  
–DB9  
9
+DB9  
–DB8  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
+DB8  
–I/O  
+I/O  
–REQ  
+REQ  
–C/D  
+C/D  
–SEL  
+SEL  
–MSG  
+MSG  
–RST  
+RST  
–ACK  
+ACK  
–BSY  
+BSY  
–ATN  
+ATN  
–DBP  
+DBP0  
–DB7  
+DB7  
–DB6  
+DB6  
–DB5  
+DB5  
–DB4  
+DB4  
–DB3  
+DB3  
–DB2  
+DB2  
–DB1  
+DB1  
–DB0  
+DB0  
–DBP1  
–DB15  
+DP1  
+DB15  
–DB14  
+DB14  
–DB13  
+DB13  
–DB12  
+DB12  
+5 V  
MATED 2  
5 V GND  
5 V GND  
ACTIVE LED OUT [4] [9]  
DLYD_START [6] [9] [12]  
SCSI ID (1) [7] [9] [12]  
SCSI ID (3) [7] [9] [12]  
+5 V  
+5 V CHARGE  
RMT_START [5] [9] [12]  
SCSI ID (0) [7] [9] [12]  
SCSI ID (2) [7] [9] [12]  
Notes [ ]: See page following this table.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
67  
   
Notes [ ] for Tables 17 through 20.  
[1] See Section 10.6.4.1 for detailed electrical characteristics of these signals.  
[2] The conductor number refers to the conductor position when using 0.025-inch (0.635 mm) centerline flat  
ribbon cable. Other cables types may be used to implement equivalent contact assignments.  
[3] Connector contacts are on 0.050 inch (1.27 mm) centers.  
[4] Front panel LED signal; indicates drive activity for host front panel hard drive activity indicator.  
[5] Asserted by host to enable Motor Start option (enables starting motor via SCSI bus command).  
[6] Asserted by host to enable Delayed Motor Start option (motor starts at power on or after a delay of 12 sec-  
onds times drive ID). This and [3] above are mutually exclusive options.  
[7] Binary code on A3, A2, A1 and A0 asserted by host to set up SCSI bus ID in drive.  
[8] GND provides a means for differential devices to detect the presence of a single ended device on the bus.  
Drive will not operate I/O bus at Ultra2 or faster SCSI data rates if this is grounded.  
[9] Signals [4] through [7] are used in place of installing jumpers and cables on option select connector J6.  
See Section 8.1.1 notes.  
[10] “NC” means no connection.  
[11] 8 bit devices which are connected to the 16 data bit LVD I/O shall leave the following signals open: –DB8,  
–DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.  
8 bit devices which are connected to the 16 data bit single-ended (SE) I/O shall have the following signals  
open: DB8, –DB9, –DB10, –DB11, –DB12, –DB13, –DB14, –DB15, and –DBP1.  
All other signals should be connected as shown.  
[12] Pins 38, 39, 40, 44, 78, 79, and 80 are option select pins and are tied high by the drive circuitry. The pre-  
ferred electrical connection at the backplane is either open or grounded (open for the ‘1’ setting, grounded  
for the ‘0’ setting). Alternatively, these pins may be driven by a 3.3V logic device, pulled up to 3.3V  
through a pull-up resistor (recommended size of 10K ohm), or grounded through some other means.  
10.7  
Electrical description  
Cheetah 15K.5 SCSI drives are multimode devices. That is, their I/O circuits can operate as either single-  
ended or low voltage differential drivers/receivers (selectable using the I/O “DIFFSENS” line).  
See ANSI Standard T10/1320D for detailed electrical specifications.  
10.7.1  
Multimode—SE and LVD alternatives  
When the interface “DIFFSNS” line is between -0.35 V and +0.5 V, the drive interface circuits operate single-  
ended and up to and including 20 M transfers/s (Fast-20 or Ultra SCSI). When “DIFFSNS” is between +0.7 V  
and +1.9 V, the drive interface circuits operate low voltage differential and up to and including 160 M  
transfers/s or less (Fast-160 or Ultra320 SCSI).  
This multimode design does not allow dynamically changing transmission modes. Drives must operate only in  
the mode for which the installation and interface cabling is designed. Multimode I/O circuits used by these  
drives do not operate at high voltage differential levels and should never be exposed to high voltage differential  
environments unless the common mode voltages in the environment are controlled to safe levels for single-  
ended and low voltage differential devices (see ANSI SPI-4 specification T10/1365D).  
LC and LW model drives do not have onboard terminators. Termination of the I/O lines must be provided for by  
the Host equipment designers or end users.  
LVD output characteristics  
Each differential signal driven by LVD interface drivers shall have the following output characteristics when  
measured at the disc drive connector:  
Steady state Low level output differential voltage = 0.32 V = < |Vs| = < 0.8 V (signal negation/logic 0)  
Steady state High level output differential voltage = 0.32 V = < |Vs| = < 0.8 V (signal assertion/logic 1)  
68  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
                                                     
LVD Input characteristics  
Each differential signal received by LVD interface receiver circuits shall have the following input characteristics  
when measured at the disc drive connector:  
Steady state Low level input differential voltage = 0.030 V = < Vin = < 3.6 V (signal negation/logic 0)  
Steady state High level input differential voltage = –3.6 V = < Vin = < –0.030 V (signal assertion/logic 1)  
Differential voltage = +0.030 V minimum with common-mode voltage range 0.845 V = < Vcm = < 1.685 V.  
(T10/1302D revision 20b, section A.3.1).  
VCCA  
VCCB  
LVD Signal Drivers  
Single  
Ended  
Circuitry  
Single  
Single  
Ended  
Ended  
Negation  
Driver  
Receiver  
LVD  
Receiver  
Single  
Ended  
Ground  
Driver  
Single  
Ended  
Assertion  
Driver  
LVD Signal Drivers  
Ground  
Single Ended:  
LVD:  
GND  
+Signal  
—Signal  
—Signal  
Figure 18. Typical SE-LVD alternative transmitter receiver circuits  
10.7.1.1 General cable characteristics  
To Minimize discontinuities and signal reflections, cables of different impedances should not be used in the  
same bus. Implementations may require trade-offs in shielding effectiveness, cable length, the number of  
loads, transfer rates, and cost to achieve satisfactory system operation. If shielded and unshielded cables are  
mixed within the same SCSI bus, the effect of impedance mismatch must be carefully considered. Proper  
impedance matching is especially important in order to maintain adequate margin at fast SCSI transfer rates.  
10.7.1.2  
Single-ended drivers/receivers  
The maximum total cable length allowed with drives using single-ended I/O driver and receiver circuits  
depends on several factors. Table 21 lists the maximum lengths allowed for different configurations of drive  
usage. These values are from the SPI documents. All device I/O lines must have equal to or less than 25 pf  
capacitance to ground, measured at the beginning of the stub.  
Table 21:  
Cable characteristics for single-ended circuits  
Maximum length  
Maximum number of between SCSI S.E.  
Transmission line impedance  
I/O transfer rate  
devices on the bus  
16 (wide SCSI bus)  
4 (wide SCSI bus)  
8 (wide SCSI bus)  
terminators  
REQ/ACK  
Other signals  
90 + 10 Ohms  
90 + 10 Ohms  
90 + 10 Ohms  
<10M transfers/s (Fast 10)  
<20M transfers/s (Fast 20)  
<20M transfers/s (Fast 20)  
3 meters (9.8 ft)  
3 meters (9.8 ft)  
1.5 meters (4.9 ft)  
90 + 6 Ohms  
90 + 6 Ohms  
90 + 6 Ohms  
A stub length of no more than 0.1 meter (0.33 ft) is allowed off the mainline interconnection with any connected  
equipment. The stub length is measured from the transceiver to the connection to the mainline SCSI bus.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
69  
             
Single-ended I/O cable pin assignments for LW drives are shown in Table 18.  
Single-ended I/O pin assignments for LC models are shown in Table 19. The LC model does not require an I/O  
cable. It is designed to connect directly to a back panel connector.  
10.7.1.3  
Cables for low voltage differential drivers/receivers  
The SPI-3 and SPI-4 specification for differential impedance for LVD cables is 122.5 + 12.5 ohms.  
The maximum SCSI bus length between the terminators for a SCSI LVD point-to-point system (one initiator  
and one target) is 25 meters (82 feet).  
The maximum SCSI bus length between the terminators for a SCSI LVD multidrop system (up to 16 total SCSI  
devices) is 12 meters (39.37 feet). However, implementation of this 12-meter total length is dependent on the  
configuration of the system and the choice of cable. See Tables 22 and 23 for examples of recommended  
SCSI LVD cable types and lengths.  
It should be noted from the data in Tables 22 and 23 that shielded round twisted-pair cables can be used to  
implement a 12-meter system, while Twist-n-flat cables cannot be used to implement a 12-meter system due to  
higher levels of attenuation and crosstalk. In addition, twist-n-flat cables with shorter sections of twist allow  
greater crosstalk and their lengths must be reduced as shown in Table 23.  
Table 22:  
Shielded round twisted-pair cables—into a multi-drive backplane  
Single-  
ended  
Single-  
ended  
Conductor  
DC  
resistance,  
nominal  
Differential  
Time  
delay,  
nominal  
Maximum shielded round  
twisted-pair cable length  
for U160/U320  
Cable  
description  
impedance impedance, capacitance,  
, nominal  
nominal  
maximum  
30 AWG  
solid  
12 meters minus the SCSI  
trace length of the backplane  
130 ohms  
90 ohms  
17 pF/ft  
1.36 ns/ft 0.113 ohms/ft  
1.54 ns/ft 0.067 ohms/ft  
1.50 ns/ft 0.065 ohms/ft  
28 AWG  
stranded  
12 meters minus the SCSI  
trace length of the backplane  
123 ohms  
132 ohms  
80 ohms  
85 ohms  
19 pF/ft  
20 pF/ft  
28 AWG  
stranded  
12 meters minus the SCSI  
trace length of the backplane  
Table 23:  
Twist-n-flat cables—into a multi-drive backplane  
Single-  
Conductor  
Maximum Twist-n-flat  
cable length  
Differential Single-ended  
impedance impedance, capacitance,  
ended  
Time  
delay,  
DC  
resistance,  
nominal  
Cable description , nominal  
nominal  
maximum  
nominal  
U320  
U160  
TPE, 22.25” twist,  
1.75” flat, (24” flat  
to flat), 30 AWG  
solid tinned copper  
3.05meters 6.1 meters  
(10.0 ft) (20.0 ft)  
131 ohms  
93 ohms  
15.3 pF/ft  
1.45 ns/ft 0.105 ohms/ft  
1.45 ns/ft 0.105 ohms/ft  
1.45 ns/ft 0.105 ohms/ft  
TPE, 8.1” twist,  
1.75” flat, (9.85” flat  
131 ohms  
2.45meters 4.9 meters  
(8.33 ft) (16.66 ft)  
93 ohms  
93 ohms  
15.3 pF/ft  
15.3 pF/ft  
to flat), 30 AWG  
solid tinned copper  
TPE, 4.25” twist,  
1.75” flat, (6” flat to  
131 ohms  
1.52meters 3.04meters  
(5.0 ft) (10.0 ft)  
flat), 30 AWG solid  
tinned copper  
70  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
   
10.8  
Terminator requirements  
Caution: These drives do not have onboard internal terminators. The user, systems integrator or host equip-  
ment manufacturer must provide a terminator arrangement external to the drive when termination is  
required. For LW drives, terminator modules can be purchased that plug between the SCSI I/O  
cable and the drive I/O connector or on the end of a short I/O cable stub extending past the last  
cable connector. LC drives are designed to be plugged into a backpanel connector without cabling.  
10.9  
Terminator power  
LW drives  
You can configure terminator power from the drive to the SCSI bus or have the host adaptor or other device  
supply terminator power to the external terminator. See Section 9.1 for illustrations that show how to place  
jumpers for this configuration.  
LC drives  
These drives cannot furnish terminator power because no conductors in the 80-pin I/O connector are devoted  
to terminator power.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
71  
       
10.10  
Disc drive SCSI timing  
Disc drive SCSI timing  
Table 24:  
These values are not current Cheetah 15K.5 SCSI values, but are listed for information only.  
Waveform  
symbol [1]  
Waveform  
table [1]  
Description  
Typical timing  
<1 μs  
Target Select Time (no Arbitration)  
Target Select Time (with Arbitration)  
Target Select to Command  
Target Select to MSG Out  
Identify MSG to Command  
Command to Status  
T00  
T01  
T02  
T03  
T04  
T05  
N/A  
4.5-1,2  
4.5-1  
4.5-2  
4.5-3  
4.5-5  
1.93 μs  
3.77 μs  
1.57 μs  
3.36 μs  
Command Depen-  
dent  
Command to Data (para. In)  
T06  
T07  
T08  
T09  
4.5-9  
Command Depen-  
dent  
Command to Data (para. Out)  
Command to Data (Write to Data Buffer)  
Command to Disconnect MSG  
Disconnect MSG to Bus Free  
4.5-10  
4.5-10  
4.5-6  
Command Depen-  
dent  
Command Depen-  
dent  
Command Depen-  
dent  
T10  
T11  
4.5-6,14  
4.5-6  
0.52 μs  
Disconnect to Arbitration (for Reselect)  
This measures disconnected CMD over-  
head  
Command Depen-  
dent  
Target win Arbitration (for Reselect)  
Arbitration to Reselect  
T12  
T13  
T14  
T15  
4.5-7  
4.5-7  
4.5-7  
4.5-8  
3.00 μs  
1.60 μs  
1.39 μs  
Reselect to Identify MSG In  
Reselect Identify MSG to Status  
Command Depen-  
dent  
Reselect Identify MSG to Data (media)  
Data to Status  
T16  
T17  
4.5-11  
4.5-15  
Command Depen-  
dent  
Command Depen-  
dent  
Status to Command Complete MSG  
Command Complete MSG to Bus Free  
Data to Save Data Pointer MSG  
Save Data Pointer MSG to Disconnect MSG  
Command Byte Transfer  
T18  
T19  
T20  
T21  
T22  
4.5-5,8,15  
4.5-5,8,15  
4.5-14  
4.5-14  
4.5-4  
0.98 μs  
0.51 μs  
4.00 μs  
0.79 μs  
0.04 μs  
Next Command Byte Access:  
4.5-4  
Next CDB Byte Access (Byte 2 of 6)  
Next CDB Byte Access (Byte 3 of 6)  
Next CDB Byte Access (Byte 4 of 6)  
Next CDB Byte Access (Byte 5 of 6)  
Next CDB Byte Access (Byte 6 of 6)  
T23.6.2  
T23.6.3  
T23.6.4  
T23.6.5  
T23.6.6  
4.5-4  
0.58 μs  
0.12 μs  
0.12 μs  
0.12 μs  
0.12 μs  
4.5-4  
4.5-4  
4.5-4  
4.5-4  
72  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
   
Table 24:  
Disc drive SCSI timing (Continued)  
These values are not current Cheetah 15K.5 SCSI values, but are listed for information only.  
Waveform  
symbol [1]  
Waveform  
table [1]  
Description  
Typical timing  
0.59 μs  
Next CDB Byte Access (Byte 2 of 10)  
Next CDB Byte Access (Byte 3 of 10)  
Next CDB Byte Access (Byte 4 of 10)  
Next CDB Byte Access (Byte 5 of 10)  
Next CDB Byte Access (Byte 6 of 10)  
Next CDB Byte Access (Byte 7 of 10)  
Next CDB Byte Access (Byte 8 of 10)  
Next CDB Byte Access (Byte 9 of 10)  
Next CDB Byte Access (Byte 10 of 10)  
Data In Byte Transfer (parameter)  
Data Out Byte Transfer (parameter)  
Next Data In Byte Access (parameter)  
Next Data Out Byte Access (parameter)  
Data In Byte Transfer (media) [2]  
Data Out Byte Transfer (media) [2]  
Next Data In Byte access (media [2]  
Next Data Out Byte access (media [2]  
MSG IN Byte Transfer  
T23.10.2  
T23.10.3  
T23.10.4  
T23.10.5  
T23.10.6  
T23.10.7  
T23.10.8  
T23.10.9  
T23.10.10  
T24  
4.5-4  
4.5-4  
0.11 μs ±1 μs  
0.12 μs ±1 μs  
0.11 μs ±1 μs  
0.11 μs ±1 μs  
0.13 μs ±1 μs  
0.12 μs ±1 μs  
0.12 μs ±1 μs  
0.12 μs ±1 μs  
0.04 μs  
4.5-4  
4.5-4  
4.5-4  
4.5-4  
4.5-4  
4.5-4  
4.5-4  
4.5-12  
4.5-13  
4.5-12  
4.5-13  
4.5-12  
4.5-13  
4.5-12  
4.5-13  
4.5-5,7,8,14,15  
4.5-2  
T25  
0.04 μs  
T26  
0.12 μs  
T27  
0.12 μs  
T28  
0.04 μs  
T29  
0.04 μs  
T30  
0.12 μs  
T31  
0.12 μs  
T32  
0.04 μs  
MSG OUT Byte Transfer  
T33  
0.04 μs  
STATUS Byte Transfer  
T34  
4.5-5,8,15  
0.04 μs  
Synchronous Data Transfer Characteristics:  
Request Signal Transfer Period [3]  
various (800 ns max)  
Notes.  
[1] See the Timing examples section of the Parallel SCSI Interface Manual.  
[2] Maximum SCSI asynchronous interface transfer rate is given in Section 5.2.3 of this manual.  
[3] Synchronous Transfer Period is determined by negotiations between an Initiator and a Drive. The Drive is  
capable of setting periods as given in Section 10.5. See also the Synchronous data transfer section and  
the Extended messages section of the Parallel SCSI Interface Manual for a description of synchronous  
data transfer operation.  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
73  
           
10.11  
Drive activity LED  
The following table provides drive activity LED status.  
Table 25: Drive activity LED status  
Spindle status  
Command status  
LED status  
Spinning up with DC power applied N/A  
On until spinup is complete  
Spun down  
Start Unit  
On while processing the command  
Off due to absence of power  
Powered down by removal of DC  
power  
N/A  
Spun up  
Stop Unit  
On while processing the command  
Off  
Spun down  
Spun down  
Spun down  
Spun down  
Spun up  
No command activity  
Write/Read Buffer  
SCSI Bus Reset  
Test Unit Ready  
No command activity  
Write/Read  
On while processing the command  
On while processing the reset  
On while processing the command  
Off  
Spun up  
On while processing the command  
On while processing the reset  
On while processing the command  
Spun up  
SCSI Bus Reset  
Test Unit Ready  
Spun up  
Spun up  
Format with Immediate option on On while the command is initially processed  
Spun up  
Format without Immediate  
LED toggles on/off on each cylinder boundary  
Toggles on/off  
Spun up  
Write Same Command in prog-  
ress  
74  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
       
bytes per sector 49  
Index  
C
Symbols  
+5 and +12 volt supplies 23  
cable 57  
cache 12  
cache buffer 8  
Numerics  
68-conductor connector 60  
68-pin connector 61  
80 conductor connector 60  
80 conductor interface 60  
80-pin connector option 59  
80-pin I/O connector 66, 67  
cache mode 12  
cache operation 12  
cache segments 13  
caching write data 13  
Canadian Department of Communications 3  
capacities 9  
capacity, drive, programmable 9  
CE Marking 4  
changeable bit 51  
changeable value 51  
check condition 51  
circuits 69  
A
AC power 22  
access time 11  
accessories 9  
acoustics 33  
activity indicator 68  
activity LED 74  
actuator 43  
actuator assembly 7  
AFR 14  
air cleanliness 32  
class B limit 3  
command 12, 46  
command descriptor block (CDB) 11  
command queuing 8  
condensation 29  
conducted noise immunity 23, 24  
connect/disconnect 11  
connector 57  
connector contact 68  
continuous vibration 32  
controller 12  
controller overhead 11  
cooling 43  
air flow 43  
suggested 43  
altitude 29  
altitude and atmospheric pressure 29  
ambient 29  
Annualized Failure Rate 14  
Annualized Failure Rates (AFR) 15  
ANSI SCSI documents 5  
arbitration priority 61  
asynchronous interface transfer rate 73  
audible noise 3  
C-Tick Marking 4  
current 24  
current profile 24, 25  
current requirements 22  
current value 51  
Australia/New Zealand Standard 4  
automatic retry 14  
automatic shipping lock 7  
average idle current 22, 23  
average latency 8  
D
daisy-chain 24, 58, 61  
DAR 38  
data block size  
modifing the 8  
average rotational latency 10, 11  
data correction 14  
data transfer period 56  
data transfer protocol 7  
data transfer rate 11  
DC cable and connector 57  
DC current 58  
DC power 12, 14, 42, 57  
DC power carrying conductor 60  
DC power connector 56  
DC power requirements 22  
DC power source 60  
dedicated landing zone 6  
B
Background Media Scan 37  
background processing 8  
backward compatibility 6  
bits/inch 10  
BMS 37  
buffer 12  
space 12  
bulkhead connector 58  
bus device reset message 51  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
75  
default 41, 42  
default mode parameter 39  
default value 51  
EVPD bit 50  
execution time 11  
extended messages 46  
defect/error management 35  
defects 35  
Deferred Auto-Reallocation 38  
delayed motor start option 22, 23, 68  
delayed start 42  
differential I/O circuit 42  
differentiating features 6  
dimensions 33  
disc rotational speed 10  
drive 32  
F
FCC rules and regulations 3  
firmware 51  
flat ribbon cable 68  
flaw reallocation 11  
format 49  
format command 11  
format time 11  
formatting 39  
drive activity 68  
drive activity LED 74  
drive capacity 10  
front panel 33  
front panel LED 68  
programmable 9  
drive default mode parameter 39  
drive firmware 51  
G
gradient 29  
drive ID 39  
ground return 23  
grounding 44  
drive ID select jumper connector 39  
drive ID/option select header 39  
drive interface connector 60  
drive internal defects and errors 35  
drive mounting 33, 44  
constraints 14  
drive orientation 43  
drive power 39  
drive primary defects list 35  
drive SCSI timing 72  
drive select header 56  
drive spindle 42  
H
hard reset 51  
HDA 6, 44  
heat removal 43  
host 42, 49, 58, 61  
host adapter 39  
adapter/initiator 61  
host backplane wiring 58  
host equipment 44, 59, 60  
DC power 60  
host I/O signal 39  
host system 39  
dynamic spindle brake 7  
E
host system malfunction 14  
host/drive operational interface 14  
hot plug 7, 16  
ECC 14  
ECC correction capability 7  
electrical characteristics 56, 68  
electromagnetic compatibility 3  
electromagnetic susceptibility 33  
embedded servo 7  
humidity 29  
I
I/O connector 58  
identified defect 35  
EMC compliance 4  
EMI requirements 3  
environmental control 32  
environmental limits 29  
environmental requirements 14  
EPROM 51  
Idle Read After Write 38  
Input characteristics 69  
inquiry command 50  
inquiry vital product data 50  
installation 39  
error 14  
installation guide 9  
management 35  
error management system 37  
error rate 14  
error recovery 35  
errors 35  
installation instructions 39  
instantaneous current peak 23  
integrated Ultra1/Ultra2 SCSI controller 7  
interface cable length 61  
interface data 11  
ETF defect list 35  
European Union requirements 4  
interface requirements 45  
76  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
interface timing 14  
internal data rate 10  
IRAW 38  
MTBF 14, 15  
multiconnector  
80 conductor 60  
multimode drivers and receivers 7  
multi-segmented cache control 12  
J
J1-auxiliary 39  
N
jumper 9, 39, 41, 42, 68  
jumper function description 42  
jumper header 41  
noise 24  
audible 3  
jumper plug type 39  
non-operating 29, 30, 32  
temperature 29  
non-operating vibration 32  
nonshielded 68 conductor connector 60  
L
landing zone 7  
LED 74  
O
logical block address 12  
logical characteristics 56  
logical segments 12  
office environment 32  
operating 29, 30, 32  
low voltage differential (LVD) drivers and receivers 7 operating option 39  
LVD 68  
LVD interface receiver circuits 69  
operating parameter 51  
option jumper 39  
option jumper location 39  
option select header 56  
option select jumper 39  
options 9  
M
mating connector 57, 59, 60  
mating flat cable connector 60  
maximum current requirements 24  
maximum operating current 23  
maximum starting current 22, 23  
ME jumper 42  
orientation 30, 43  
out-of-plane deflection 44  
out-of-plane distortion 44  
Output characteristics 68  
mean time between failure (MTBF) 15  
media 7, 51  
Media Pre-Scan 37  
P
package size 30  
message protocol 56  
message protocol system 37  
messages  
package test specification 5  
packaged 30  
parity 42  
SCSI interface 45  
parity checking 42  
miscellaneous features 55  
mode page 01 51  
parity error 42  
PCB 41  
mode page 08h 12  
mode parameter 51  
mode select command 12, 51  
mode sense command 51  
mode sense data 51  
PCBA 39, 44, 51, 57, 58, 61  
PCBA circuit run 58  
PD jumper 42  
peak bits/inch 10  
peak starting current 23  
performance characteristics 10  
performance degradation 30  
peripheral I/O cable 24  
physical characteristics 56  
physical damage 32  
physical interface 56, 58  
power 23, 42  
power connector 22, 24  
power control switch 12  
power dissipation 26  
power distribution 3  
power sequencing 24  
mode sense value 51  
model number table 6  
motor start command 12  
motor start delay option 68  
motor start option 12, 23, 68  
mounting configuration 33  
mounting configuration dimensions 33, 34  
mounting constraints 14, 44  
mounting point 44  
mounting surface 44  
mounting surface distortion 44  
mounting surface stiffness 44  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
77  
power supply voltage 14  
power-carrying conductor 60  
power-on 39, 68  
SCSI ID 39, 42  
SCSI interface 12, 58  
SCSI interface cable 59  
SCSI interface commands supported 46  
SCSI interface connector 56  
SCSI interface data 11  
SCSI Interface Product Manual 3, 5, 6  
SCSI systems error 37  
SCSI systems error management 37  
Seagate support service 39  
sector sizes 11  
power-on reset 51  
power-up 24, 42  
prefetch 12  
prefetch (read look-ahead) 12  
prefetch mode 12  
prefetch operation 12  
prefetch segmented cache control 12  
preventive maintenance 14, 15  
product data page 50  
seek error 14  
programmable drive capacity 9  
defined 15  
Self-Monitoring Analysis and Reporting Technology.  
SE-LVD alternative 69  
shielding 3  
shipping 21  
shipping container 29  
shock 30  
and vibration 30  
shock mount 44  
signal ground 44  
single unit shipping pack 9  
single-ended (SE) drivers and receivers 7  
spindle startup 42  
standard day 29  
standards 3  
start motor command 23  
start unit command 42  
start/stop time 12  
status 37  
stop spindle 12  
R
radio interference regulations 3  
RCD bit 12  
read error rate 14  
read error rates 35  
read retry count 35  
read/write head 10  
ready 51  
receive diagnostic results 37  
receiver circuits 69  
recommended mounting 31  
Recoverable Errors 14  
reference documents 5  
regulation 22, 23  
relative humidity 29  
reliability 8  
reliability and service 15  
reliability specifications 14  
remote switch 39  
stop time 12  
straight-in connector 61  
supply voltage 23  
repair information 21  
REQ/ACK offset 56  
request sense command 37  
resonance 30  
support services 1  
synchronous data transfer 56  
synchronous data transfer operation 73  
synchronous data transfer period 56  
synchronous transfer period 73  
system chassis 44  
S
S.M.A.R.T. 8, 16  
safe power transmission 60  
safety 3  
saved value 51  
SCSI  
T
technical support services 1  
temperature 18, 29, 43  
non-operating 29  
commands 46  
interface data transfer rate 11  
messages 45  
regulation 3  
See also cooling  
SCSI bus cable 39  
SCSI bus condition 55  
SCSI bus ID 68  
SCSI bus phase sequence 55  
SCSI command 35  
SCSI Commands Reference Manual 5  
SCSI I/O connector 58  
temperature sensor 18  
termination 24  
terminator enable jumper TE 61  
terminator power 71  
terminator requirements 39, 71  
thermal monitor 18  
78  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
TP1 position 42  
tracks/inch 10  
tracks/surface, total 10  
transfer period 56  
transmitter receiver circuits 69  
Tunneling Magnetoresistive heads 6  
U
Ultra160 51  
Ultra160 mode 46  
Ultra160 SCSI interface 6  
Ultra320 SCSI controller 7  
unformatted 8  
Unrecoverable Errors 14  
V
vibration 30, 32  
vital product data 50  
volatile memory 51  
voltage 22, 23  
W
warranty 8, 20  
wet bulb temperature 29  
wide Ultra160 SCSI interface 6  
WP jumper 42  
write protect 42  
write retry count 35  
Z
zoned bit recording (ZBR) 7  
Cheetah 15K.5 SCSI Product Manual, Rev. J  
79  
Seagate Technology LLC  
920 Disc Drive, Scotts Valley, California 95066-4544, USA  
Publication Number: 100384776, Rev. J  

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