Seagate Cheetah ST3146954FC User Manual

Cheetah 15K.4 FC  
ST3146954FC  
ST373554FC  
ST336854FC  
Cheetah 15K.4 FC  
ST3146954FC  
ST373554FC  
ST336854FC  
©2005, 2006, Seagate Technology LLC All rights reserved  
Publication number: 100366896, Rev. B  
March 2006  
Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate  
Technology LLC. SeaTools, SeaFONE, SeaBOARD, and SeaTDD are either registered  
trademarks or trademarks of Seagate Technology LLC. Other product names are registered  
trademarks or trademarks of their owners.  
Seagate reserves the right to change, without notice, product offerings or specifications. No  
part of this publication may be reproduced in any form without written permission of Seagate  
Technology LLC.  
Revision status summary sheet  
Revision  
Date  
Sheets Affected  
Rev. A  
07/15/05  
03/17/06  
All.  
Rev. B (Draft 1)  
Pages 25 and 26.  
Contents  
6.4  
Cheetah 15K.4 FC Product Manual, Rev. B  
i
9.6  
ii  
Cheetah 15K.4 FC Product Manual, Rev. B  
iv  
Cheetah 15K.4 FC Product Manual, Rev. B  
List of Figures  
Cheetah 15K.4 FC Product Manual, Rev. B  
v
1.0  
Scope  
This manual describes Seagate Technology® LLC, Cheetah® 15K.4 FC (Fibre Channel) disc drives.  
Cheetah 15K.4 FC drives support the Fibre Channel Arbitrated Loop and SCSI Fibre Channel Protocol specifi-  
cations to the extent described in this manual. The Fibre Channel Interface Manual (part number 77767496)  
describes the general Fibre Channel Arbitrated Loop characteristics of this and other Seagate Fibre Channel  
drives.  
Figure 1.  
Cheetah 15K.4 FC family disc drive  
Cheetah 15K.4 FC Product Manual, Rev. B  
1
     
2
Cheetah 15K.4 FC Product Manual, Rev. B  
2.0  
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 8.5.  
2.1  
Standards  
The Cheetah 15K.4 FC family complies with Seagate standards as noted in the appropriate sections of this  
manual and the Seagate Fibre Channel Interface Manual, part number 77767496.  
The Cheetah 15K.4 FC disc drive is a UL recognized component per UL1950, CSA certified to CAN/CSA  
C22.2 No. 950-95, and VDE certified to VDE 0805 and EN60950.  
2.1.1  
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.  
2.1.1.1  
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 2, DC power requirements.  
Cheetah 15K.4 FC Product Manual, Rev. B  
3
                                 
2.1.2  
Electromagnetic compliance  
Seagate uses an independent laboratory to confirm compliance with the directives/standards 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 with the directives/standards, we cannot guarantee  
that all systems will comply. The computer manufacturer or system integrator shall confirm EMC compliance  
and provide the appropriate 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.  
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).  
4
Cheetah 15K.4 FC Product Manual, Rev. B  
 
2.2  
Reference documents  
Cheetah 15K.4 FC Installation Guide  
Seagate part number: 100366897  
Seagate part number: 77767496  
Fibre Channel Interface Manual  
ANSI Fibre Channel Documents  
Project T11/1619-D  
Project T11/1506-D  
ANSI INCITS 332-1999  
ANSI INCITS 332-1999/AM1-2003  
ANSI INCITS 350-2003  
NCITS TR-19  
FC-FS-2 Fibre Channel - Framing and Signaling  
FC-PI-2 Fibre Channel - PHYSICAL INTERFACES - 2  
FC.AL-2 Arbitrated Loop 2  
FC.AL-2 Arbitrated Loop 2 Amendment  
FCP-2 Fibre Channel Protocol 2  
Private Loop SCSI Direct Attach (PLDA)  
Fabric Loop Attachment (FC-FLA)  
NCITS TR-20  
SFF-8045  
SFF-8067  
Specification for 40-pin SCA-2 Connector with Parallel Selection  
Specification for 40-pin SCA-2 Connector with Bidirectional  
Enclosure Services Interface  
ANSI Small Computer System Interface (SCSI) Documents  
ISO/IEC 14776-xxx  
ISO/IEC 14776-xxx  
ISO/IEC 14776-xxx  
SCSI Architecure Model-3 (SAM-3) Standard (T10/1561-D)  
SCSI Primary Commands-3 (SPC-3) Standard (T10/1416-D)  
SCSI Block Commands-2 (SBC-2) Standard (T10/1417-D)  
Specification for Acoustic Test Requirement and Procedures  
Seagate part number: 30553-001  
Package Test Specification  
Package Test Specification  
Seagate P/N 30190-001 (under 100 lb.)  
Seagate P/N 30191-001 (over 100 lb.)  
In case of conflict between this document and any referenced document, this document takes precedence.  
Cheetah 15K.4 FC Product Manual, Rev. B  
5
             
6
Cheetah 15K.4 FC Product Manual, Rev. B  
3.0  
General description  
Cheetah 15K.4 FC drives combine giant magnetoresistive (GMR) heads, partial response/maximum likelihood  
(PRML) read channel electronics, embedded servo technology, and a Fibre Channel interface to provide high  
performance, high capacity data storage for a variety of systems including engineering workstations, network  
servers, mainframes, and supercomputers. Cheetah 15K.4 FC drives also support 2-Gbit Fibre Channel which  
can transfer data at up to 200 Mbytes per second and 400 Mbytes per second in dual-loop configurations.  
ST373453, ST336753, and ST318453 models also support 4-Gbit Fibre Channel which can transfer data at up  
to 400 Mbytes per second and 800 Mbytes per second in dual-loop configurations.  
Cheetah 15K.4 FC drives support the Fibre Channel Arbitrated Loop (FC-AL) and SCSI Fibre Channel Proto-  
col as described in the ANSI specifications, this document, and the Fibre Channel Interface Manual (part num-  
ber 77767496) which describes the general interface characteristics of this drive. Cheetah 15K.4 FC drives are  
classified as intelligent peripherals and provide level 2 conformance (highest level) with the ANSI SCSI-1 stan-  
dard.  
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 does not contain user-replaceable parts. Opening the  
HDA for any reason voids your warranty.  
Cheetah 15K.4 FC 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 heads automatically go to the land-  
ing zone when power is removed from the drive.  
An automatic shipping lock prevents potential damage to the heads and discs that results from movement dur-  
ing shipping and handling. The shipping lock disengages and the head load process begins when power is  
applied to the drive.  
The drives also use a high-performance actuator assembly with a low-inertia, balanced, patented, straight arm  
design that provides excellent performance with minimal power dissipation.  
Cheetah 15K.4 FC Product Manual, Rev. B  
7
     
3.1  
Standard features  
Cheetah 15K.4 FC drives have the following standard features:  
• 4-Gbit Fibre Channel interface. For 2 or 4 gigabit operation, the block size must be divisable by 8.  
• Integrated dual port FC-AL controller  
• Concurrent dual port transfers  
• Support for FC arbitrated loop, private and public attachment  
• Differential copper FC drivers and receivers  
• Downloadable firmware using the FC-AL interface  
• Supports SCSI enclosure services via interface connector  
• 128-deep task set (queue)  
• Supports up to 32 initiators  
• Drive selection ID and configuration options are set on the FC-AL backpanel or through interface com-  
mands. Jumpers are not used on the drive.  
• Supports SCSI Enclosure Services through the interface connector  
• Fibre Channel worldwide name uniquely identifies the drive and each port  
• User-selectable logical block size (512 to 528 bytes per logical block). For 2 or 4 gigabit operation, the block  
size must be divisable by 8.  
• Selectable frame sizes from 256 to 2,112 bytes  
• Industry standard 3.5-inch low profile form factor dimensions  
• Programmable logical block reallocation scheme  
• Flawed logical block reallocation at format time  
• Programmable auto write and read reallocation  
• Reed-Solomon error correction code  
• Sealed head and disc assembly (HDA)  
• No preventive maintenance or adjustments required  
• Dedicated head landing zone  
• Automatic shipping lock  
• Embedded Grey Code track address to eliminate seek errors  
• Self-diagnostics performed at power on  
• 1:1 interleave  
• Zone bit recording (ZBR)  
• Vertical, horizontal, or top down mounting  
• Dynamic spindle brake  
• 16,384 Kbyte data buffer (see Section 4.5).  
• Embedded servo design  
• Reallocation of defects on command (Post Format)  
• Fibre Channel interface transports SCSI protocol  
3.2  
Media description  
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.  
8
Cheetah 15K.4 FC Product Manual, Rev. B  
                                   
3.3  
Performance  
• Programmable multi-segmentable cache buffer  
• 200 Mbytes/sec maximum instantaneous data transfers per port  
• 15k RPM spindle; average latency = 2.0 msec  
• Command queuing of up to 128 commands  
• Background processing of queue  
• Supports start and stop commands (spindle stops spinning)  
• Adaptive seek velocity; improved seek performance  
3.4  
Reliability  
• 1,400,000 hour MTBF  
• Increased LSI circuitry integration  
• Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)  
• Dithering  
3.5  
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:  
ST336854FC  
Decimal  
ST373554FC  
Decimal  
ST3146954FC  
Decimal  
Sector Size  
512  
Hex  
Hex  
Hex  
71,687,372  
70,512,692  
70,197,546  
68,914,176  
68,766,592  
445DCCC  
433F034  
42F212A  
41B8C00  
4194B80  
143,374,744  
141,025,384  
140,395,092  
139,463,602  
137,577,184  
88BB998  
867E068  
85E4254  
8500BB2  
83342E0  
286,749,488  
282,050,768  
280,790,184  
279,041,740  
275,154,368  
11177330  
10CFC0D0  
10BC84A8  
10A1D6CC  
106685C0  
514  
520  
522  
524  
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.  
3.5.1  
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 Product 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  
Cheetah 15K.4 FC Product Manual, Rev. B  
9
                     
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.  
3.6  
Factory-installed accessories  
OEM standard drives are shipped with the Cheetah 15K.4 FC Installation Guide (part number 100366897) and  
the Safety and Regulatory Agency Specifications, part number 75789512 (unless otherwise specified).  
3.7  
Factory-installed options  
You may order the following items which are incorporated at the manufacturing facility during production or  
packaged 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.4 FC Installation Guide, part number 100366897, is usually included with each standard  
OEM drive shipped, but extra copies may be ordered.  
• The Safety and Regulatory Agency Specifications, part number 75789512, is usually included with each  
standard OEM drive shipped, but extra copies may be ordered.  
3.8  
User-installed accessories  
The following accessories are available. All kits may be installed in the field.  
• Evaluation kit, Seagate part number 100364396.  
This kit provides an adapter card (“T-card”) to allow cable connections for two FC ports and DC power. You  
may purchase this evaluation kit from channel distributors or your Seagate representative.  
• Single-unit shipping pack.  
10  
Cheetah 15K.4 FC Product Manual, Rev. B  
         
4.0  
Performance characteristics  
This section provides detailed information concerning performance-related characteristics and features of  
Cheetah 15K.4 FC drives.  
4.1  
Internal drive characteristics  
ST3146954FC  
146.8  
ST373554FC ST336854FC  
Drive capacity  
73.4  
36.7  
Gbytes (formatted, rounded off value)  
Read/write data heads  
Bytes per track  
Bytes per surface  
Tracks per surface (total)  
Tracks per inch  
Peak bits per inch  
Internal data rate  
Disc rotation speed  
Avg rotational latency  
8
4
2
471,916  
18,351  
50,864  
85,000  
628  
685-1,142  
15k  
2.0  
471,916  
18,351  
50,864  
85,000  
628  
685-1,142  
15k  
2.0  
471,916  
18,351  
50,864  
85,000  
628  
685-1,142  
15k  
2.0  
Bytes (average, rounded off values)  
Mbytes (unformatted, rounded off value)  
Tracks (user accessible)  
TPI  
KBPI  
Mbits/sec (variable with zone)  
rpm  
msec  
4.2  
Seek performance characteristics  
See Section 9.5, "FC-AL physical interface" on page 64 and the Fibre Channel Interface Manual (part number  
77767496) for additional timing details.  
4.2.1  
Access time  
1 2  
,
Not including controller overhead (msec)  
Read  
3.5  
Write  
4.0  
Average  
Typical  
Typical  
Typical  
Single track  
Full stroke  
0.27  
7.4  
0.45  
7.9  
1.  
2.  
Typical access times are measured under nominal conditions of temperature, voltage,  
and horizontal orientation as measured on a representative sample of drives.  
Access to data = access time + latency time.  
Cheetah 15K.4 FC Product Manual, Rev. B  
11  
                                                   
4.2.2  
Format command execution time (minutes)  
ST3146954FC  
ST373554FC  
ST336854FC  
90  
45  
60  
30  
30  
15  
Maximum (with verify)  
Maximum (without verify)  
4.2.3  
General performance characteristics  
Data buffer to/from disc media (one 512-byte logical block)*  
Minimum  
Maximum  
685 Mbits/sec  
1,142 Mbits/sec  
Fibre Channel Interface maximum instantaneous transfer rate  
200 Mbytes/sec* per port  
(dual port = 400 Mbytes/sec*)  
Logical block sizes  
Default is 512-byte data blocks  
Variable 512 to 704 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 Negligible  
using the spare sectors per sparing zone reallocation scheme.)  
Average rotational latency  
2.0 msec  
*Assumes no errors and no relocated logical blocks. Rate measured from the start of the first logical block transfer to or  
from the host.  
4.3  
Start/stop time  
If the Motor Start option is disabled, the drive becomes ready within 20 seconds after DC power is applied. If a  
recoverable error condition is detected during the start sequence, the drive executes a recovery procedure and  
the time to become ready may exceed 20 seconds. Stop time is 30 seconds (maximum) from removal of DC  
power.  
If the Motor Start option is enabled, the internal controller accepts the commands listed in the Fibre Channel  
Interface 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 (excluding the error recovery  
procedure). The Motor Start command can also be used to command the drive to stop the spindle.  
There is no power control switch on the drive.  
4.4  
Prefetch/multi-segmented cache control  
The drive provides a prefetch (read look-ahead) and multi-segmented cache control algorithms that in many  
cases can enhance system performance. Cache refers to the drive buffer storage space when it is used in  
cache operations. To select this feature, the host sends the Mode Select command with the proper values in  
12  
Cheetah 15K.4 FC Product Manual, Rev. B  
                         
the applicable bytes in page 08h. Prefetch and cache operations are independent features from the standpoint  
that each is enabled and disabled independently using the Mode Select command; however, in actual opera-  
tion, the prefetch feature overlaps cache operation somewhat as described in sections 4.5.1 and 4.5.2.  
All default cache and prefetch mode parameter values (Mode Page 08h) for standard OEM versions of this  
drive family are given in Table 18.  
4.5  
Cache operation  
Note. Refer to the Fibre Channel Interface Manual for more detail concerning the cache bits.  
Of the 16,384 kbytes physical buffer space in the drive, approximately 14,218 kbytes can be used as a cache.  
Cache segmenting is adjusted dynamically by the disk drive hardware according to the workload being experi-  
enced by the drive. The drive is capable of dynamically-adjusting up to 256 segments. The number and sizes  
of segments are not user-defined.  
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 Fibre Channel Interface Manual), data requested by the host with a read  
command 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. On a cache miss, all data transfers to the host are in accordance  
with buffer-full ratio rules. On a cache hit, the drive ignores the buffer-full ratio rules. See the explanation pro-  
vided with the information about Mode Page 02h (disconnect/reconnect control) in the Fibre Channel Interface  
Manual.  
The following is a simplified description of the prefetch/cache operation:  
Case A—read command is received and the first logical block is already in the cache:  
1. Drive transfers to the initiator the first logical block requested plus all subsequent contiguous logical blocks  
that are already in the cache. This data may be in multiple segments.  
2. When a requested logical block is reached that is not in any cache segment, the drive fetches it and any  
remaining requested logical block addresses from the disc and puts them in a segment of the cache. The  
drive transfers the remaining requested logical blocks from the cache to the host in accordance with the  
Mode Select Disconnect/Reconnect parameters, page 02h.  
3. If the prefetch feature is enabled, refer to section 4.5.2 for operation from this point.  
Case B—A Read command requests data, and the first 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 4.5.2 for operation from this point.  
During a prefetch, the drive crosses a cylinder boundary to fetch data only if the Discontinuity (DISC) bit is set  
to 1 in bit 4 of byte 2 of the Mode Select parameters page 08h. Default is zero for bit 4.  
Each cache segment is actually a self-contained circular buffer whose length is an integer number of logical  
blocks. The sizes of the segments are determined by the drive’s analysis of the current workload.  
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.  
Cheetah 15K.4 FC Product Manual, Rev. B  
13  
           
4.5.1  
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.  
Table 18 shows the mode default settings for the drive.  
4.5.2  
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  
buffer 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.  
Since data that is prefetched replaces data already in some buffer segments, the host can limit the amount of  
prefetch data to optimize system performance. The Max Prefetch field (bytes 8 and 9) limits the amount of  
prefetch. The drive does not use the Prefetch Ceiling field (bytes 10 and 11).  
When prefetch (read look-ahead) is enabled (enabled by DRA = 0), it operates under the control of ARLA  
(Adaptive Read Look-Ahead). If the host uses software interleave, ARLA enables prefetch of contiguous  
blocks from the disc when it senses that a prefetch hit will likely occur, even if two consecutive read operations  
were not for physically contiguous blocks of data (e.g. “software interleave”). ARLA disables prefetch when it  
decides that a prefetch hit will not likely occur. If the host is not using software interleave, and if two sequential  
read operations are not for contiguous blocks of data, ARLA disables prefetch, but as long as sequential read  
operations request contiguous blocks of data, ARLA keeps prefetch enabled.  
4.5.3  
Optimizing cache performance for desktop and server applications  
Desktop and server applications require different drive caching operations for optimal performance. This  
means it is difficult to provide a single configuration that meets both of these needs. In a desktop environment,  
you want to configure the cache to respond quickly to repetitive accesses of multiple small segments of data  
without taking the time to “look ahead” to the next contiguous segments of data. In a server environment, you  
14  
Cheetah 15K.4 FC Product Manual, Rev. B  
       
want to configure the cache to provide large volumes of sequential data in a non-repetitive manner. In this  
case, the ability of the cache to “look ahead” to the next contiguous segments of sequential data is a good  
thing.  
The Performance Mode (PM) bit controls the way the drive switches the cache buffer into different modes of  
segmentation. In “server mode” (PM bit = 0), the drive can dynamically change the number of cache buffer  
segments as needed to optimize the performance, based on the command stream from the host. In “desktop  
mode” (PM bit = 1), the number of segments is maintained at the value defined in Mode Page 8, Byte 13, at all  
times. For additional information about the PM bit, refer to the Unit Attention Parameters page (00h) of the  
Mode Sense command (1Ah) in the Fibre Channel Interface Product Manual, part number 77767496.  
Cheetah 15K.4 FC Product Manual, Rev. B  
15  
16  
Cheetah 15K.4 FC Product Manual, Rev. B  
5.0  
Reliability specifications  
The following reliability specifications assume correct host and drive operational interface, including all inter-  
face timings, power supply voltages, environmental requirements and drive mounting constraints.  
Less than 10 errors in 108 seeks  
Seek error rate:  
1
Read Error Rates  
Less than 10 errors in 1012 bits transferred (OEM default settings)  
Less than 1 sector in 1015 bits transferred  
Less than 1 sector in 1021 bits transferred  
Recovered Data  
Unrecovered Data  
Miscorrected Data  
Less than 1 error in 1012 bits transferred with minimum receive eye.  
Less than 1 error in 1014 bits transferred with typical receive eye.  
Interface error rate:  
MTBF:  
1,400,000 hours  
None required  
Preventive maintenance:  
1.  
Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.  
5.1  
Error rates  
The error rates stated in this manual assume the following:  
• The drive is operated in accordance with this manual using DC power as defined in paragraph 6.2, "DC  
• 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.  
5.1.1  
Recoverable Errors  
Recovereable 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.  
5.1.2  
Unrecoverable Errors  
15  
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.  
Cheetah 15K.4 FC Product Manual, Rev. B  
17  
                                   
5.1.3  
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.  
5.1.4  
Interface errors  
An interface error is defined as a failure of the receiver on a port to recover the data as transmitted by the  
device port connected to the receiver. The error may be detected as a running disparity error, illegal code, loss  
of word sync, or CRC error. The total error rate for a loop of devices is the sum of the individual device error  
rates.  
5.2  
Reliability and service  
You can enhance the reliability of Cheetah K15.4 disc drives by ensuring that the drive receives adequate cool-  
ing. Section 6.0 provides temperature measurements and other information that may be used to enhance the  
service life of the drive. Section 8.3 provides recommended air-flow information.  
5.2.1  
Mean time between failure (MTBF)  
The production disc drive achieves an MTBF of 1,400,000 hours when operated in an environment that  
ensures the case temperatures specified in Section 6.4.1 are not exceeded. Short-term excursions up to the  
specification limits of the operating environment will not affect MTBF performance. Operating the drive at case  
temperatures above these values will adversely affect the drive’s ability to meet specifications (see Section 6.4,  
The MTBF target is specified as device power-on hours (POH) for all drives in service per failure.  
The following expression defines MTBF:  
MTBF per measurement period = Estimated power-on operating hours in the period  
Number of drive failures in the period  
Estimated power-on operating hours means power-on hours per disc drive times the total number of disc  
drives in service. Each disc drive must have accumulated at least nine months of operation. Data is calculated  
on a rolling average base for a minimum period of six months.  
MTBF is based on the following assumptions:  
• 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 6.4.1 are not  
exceeded.  
Drive failure means any stoppage or failure to meet defined specifications caused by drive malfunction.  
A S.M.A.R.T. predictive failure indicates that the drive is deteriorating to an imminent failure and is considered  
an MTBF hit.  
5.2.2  
Preventive maintenance  
No routine scheduled preventive maintenance is required.  
18  
Cheetah 15K.4 FC Product Manual, Rev. B  
                       
5.2.3  
Hot plugging the drive  
Inserting and removing the drive on the FC-AL will interrupt loop operation. The interruption occurs when the  
receiver of the next device in the loop must synchronize to a different input signal. FC error detection mecha-  
nisms, character sync, running disparity, word sync, and CRC are able to detect any error. Recovery is initiated  
based on the type of error.  
The disc drive defaults to the FC-AL Monitoring state, Pass-through state, when it is powered-on by switching  
the power or hot plugged. The control line to an optional port bypass circuit (external to the drive), defaults to  
the Enable Bypass state. If the bypass circuit is present, the next device in the loop will continue to receive the  
output of the previous device to the newly inserted device. If the bypass circuit is not present, loop operation is  
temporarily disrupted until the next device starts receiving the output from the newly inserted device and  
regains synchronization to the new input.  
The Pass-through state is disabled while the drive performs self test of the FC interface. The control line for an  
external port bypass circuit remains in the Enable Bypass state while self test is running. If the bypass circuit is  
present, loop operation may continue. If the bypass circuit is not present, loop operation will be halted while the  
self test of the FC interface runs.  
When the self test completes successfully, the control line to the bypass circuit is disabled and the drive enters  
the FC-AL Initializing state. The receiver on the next device in the loop must synchronize to output of the newly  
inserted drive.  
If the self-test fails, the control line to the bypass circuit remains in the Enable Bypass state.  
Note. It is the responsibility of the systems integrator to assure that no temperature, energy, voltage haz-  
ard, or ESD potential hazard is presented during the hot connect/disconnect operation. Discharge  
the static electricity from the drive carrier prior to inserting it into the system.  
Caution. The drive motor must come to a complete stop prior to changing the plane of operation. This time is  
required to insure data integrity.  
5.2.4  
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 imminent drive failure and is designed to provide sufficient warning of a  
failure to allow you to back up the data before an actual failure occurs.  
Note. The drive’s firmware monitors specific attributes for degradation over time but can’t predict instanta-  
neous drive failures.  
Each monitored attribute has been selected to monitor a specific set of failure conditions in the operating per-  
formance of the drive and the thresholds are optimized to minimize “false” and “failed” predictions.  
Controlling S.M.A.R.T.  
The operating mode of S.M.A.R.T. is controlled by the DEXCPT and PERF bits on the Informational Exceptions  
Control mode page (1Ch). Use the DEXCPT bit to enable or disable the S.M.A.R.T. feature. Setting the DEX-  
CPT bit disables all S.M.A.R.T. functions. When enabled, S.M.A.R.T. collects on-line data as the drive performs  
normal read and 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.  
You can measure off-line attributes and force the drive to save the data by using the Rezero Unit command.  
Forcing S.M.A.R.T. resets the timer so that the next scheduled interrupt is in one hour.  
You can interrogate the drive through the host to determine the time remaining before the next scheduled mea-  
surement and data logging process occurs. To accomplish this, issue a Log Sense command to log page 0x3E.  
This allows you to control when S.M.A.R.T. interruptions occur. Forcing S.M.A.R.T. with the RTZ command  
resets the timer.  
Cheetah 15K.4 FC Product Manual, Rev. B  
19  
                             
Performance impact  
S.M.A.R.T. attribute data is saved to the disc so that the events that caused a predictive failure can be recre-  
ated. The drive measures and saves parameters once every two hours subject to an idle period on the FC-AL  
bus. The process of measuring off-line attribute data and saving data to the disc is uninterruptable. The maxi-  
mum on-line only processing 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 by the MRIE bits in the Informational Exceptions Control mode page (1Ch). Subject to  
the reporting method, the firmware will issue to the host an 01-5Dxx sense code. 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 errors  
increases to an unacceptable level. To determine rate, error events are logged and compared to the number of  
total operations for a given attribute. The interval defines the number of operations over which to measure 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 rates. All errors for each monitored attribute are 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 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 their interval. If the number of errors exceeds the threshold before  
the interval expires, the error rate is considered to be unacceptable. If the number of errors does not exceed  
the threshold before the interval expires, the error rate is considered to be acceptable. In either case, the inter-  
val 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 each time the error rate is unacceptable and decremented (not to exceed  
zero) whenever the error rate is acceptable. If the counter continually increments such that it reaches the pre-  
dictive threshold, a predictive failure is signaled. This counter is referred to as the Failure History Counter.  
There is a separate Failure History Counter for each attribute.  
5.2.5  
Thermal monitor  
Cheetah 15K.4 FC 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 exceeds 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.  
20  
Cheetah 15K.4 FC Product Manual, Rev. B  
 
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 65°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 1) can  
be used to set this trip point. The default value for this drive is 65°C, however, you can set it to any value in the  
range of 0 to 65°C. If you specify a temperature greater than 65°C in this field, the temperature is rounded  
down to 65°C. A sense code is sent to the host to indicate the rounding of the parameter field.  
Table 1:  
Temperature Log Page (0Dh)  
Parameter Code  
Description  
Primary Temperature  
Reference Temperature  
0000h  
0001h  
5.2.6  
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.  
5.2.6.1  
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.  
Cheetah 15K.4 FC Product Manual, Rev. B  
21  
 
5.2.6.2  
Implementation  
This section provides all of the information necessary to implement the DST function on this drive.  
5.2.6.2.1  
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.  
5.2.6.2.2  
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.  
5.2.6.2.3  
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.  
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.  
22  
Cheetah 15K.4 FC Product Manual, Rev. B  
5.2.6.2.4  
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 set to zero, the drive passed with no errors detected by the DST. If the field is not set to 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.  
5.2.6.2.5  
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).  
5.2.7  
Product warranty  
Beginning on the date of shipment to the customer and continuing for the period specified in your purchase  
contract, Seagate warrants that each product (including components and subassemblies) that fails to function  
properly under normal use due to defect in materials or workmanship or due to nonconformance to the applica-  
ble specifications will be repaired or replaced, at Seagate’s option and at no charge to the customer, if returned  
by customer at customer’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 the customer. For more detailed  
warranty information, refer to the standard terms and conditions of purchase for Seagate products on your pur-  
chase documentation.  
The remaining warranty for a particular drive can be determined by calling Seagate Customer Service at  
1-800-468-3472. You can also determine remaining warranty using the Seagate web site (www.seagate.com).  
The drive serial number is required to determine remaining warranty information.  
Shipping  
When transporting or shipping a drive, use only a Seagate-approved container. Keep your original box.  
Seagate approved containers are easily identified by the Seagate Approved Package label. Shipping a drive in  
a non-approved container 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.  
Cheetah 15K.4 FC Product Manual, Rev. B  
23  
       
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.  
24  
Cheetah 15K.4 FC Product Manual, Rev. B  
     
6.0  
Physical/electrical specifications  
This section provides information relating to the physical and electrical characteristics of the drive.  
6.1  
AC power requirements  
None.  
6.2  
DC power requirements  
The voltage and current requirements for a single drive are sh‘own below. Values indicated apply at the drive  
connector.  
Table 2:  
DC power requirements for ST3146954FC drives  
1 Gbit mode  
2 Gbit mode  
(Amps)  
+5V  
4 Gbit mode  
Notes (Amps)  
(Amps)  
(Amps)  
+12V [2]  
±5% [2]  
0.78  
(Amps)  
+5V  
(Amps)  
Voltage  
+5V  
+12V [2]  
±5% [2]  
0.78  
+12V [2]  
±5% [2]  
0.79  
Regulation  
[5]  
±5%  
0.62  
±5%  
±5%  
Avg idle current DCX  
Maximum starting current  
(peak DC) DC  
(peak AC) AC  
[1] [7]  
0.66  
0.70  
3σ [3]  
3σ [3]  
0.83  
0.99  
0.55  
1.89  
4.01  
0.04  
0.93  
1.13  
0.59  
1.89  
4.00  
0.04  
0.80  
1.08  
0.69  
1.86  
3.18  
0.04  
Delayed motor start (max) DC 3σ [1] [4]  
Peak operating current:  
Typical DCX  
[1] [6]  
3σ [1]  
3σ  
0.81  
0.83  
1.28  
0.90  
0.92  
3.04  
1.01  
1.26  
1.26  
0.88  
0.89  
3.02  
0.74  
0.76  
1.24  
1.04  
1.18  
2.92  
Maximum DC  
Maximum (peak) DC  
Cheetah 15K.4 FC Product Manual, Rev. B  
25  
                         
Table 3:  
DC power requirements for ST373554FC drives  
1 Gbit mode  
2 Gbit mode  
(Amps)  
+5V  
4 Gbit mode  
Notes (Amps)  
(Amps)  
(Amps)  
+12V [2]  
±5% [2]  
0.56  
(Amps)  
+5V  
(Amps)  
Voltage  
+5V  
+12V [2]  
±5% [2]  
0.57  
+12V [2]  
±5% [2]  
0.57  
Regulation  
[5]  
±5%  
0.62  
±5%  
±5%  
Avg idle current DCX  
Maximum starting current  
(peak DC) DC  
(peak AC) AC  
[1] [7]  
0.66  
0.69  
3σ [3]  
3σ [3]  
0.83  
0.98  
0.54  
1.88  
4.08  
0.03  
0.94  
1.11  
0.58  
1.85  
4.08  
0.04  
0.77  
1.17  
0.70  
1.71  
2.94  
0.04  
Delayed motor start (max) DC 3σ [1] [4]  
Peak operating current:  
Typical DCX  
[1] [6]  
3σ [1]  
3σ  
0.79  
0.82  
1.27  
1.01  
1.03  
2.82  
0.90  
1.18  
1.24  
0.66  
0.67  
2.98  
0.76  
0.77  
1.30  
0.79  
0.80  
2.82  
Maximum DC  
Maximum (peak) DC  
Table 4:  
DC power requirements for ST336854FC drives  
1 Gbit mode  
2 Gbit mode  
(Amps)  
+5V  
4 Gbit mode  
(Amps)  
+5V  
Notes (Amps)  
(Amps)  
(Amps)  
+12V [2]  
±5% [2]  
0.43  
(Amps)  
+12V [2]  
±5% [2]  
0.43  
Voltage  
+5V  
+12V [2]  
±5% [2]  
0.43  
Regulation  
[5]  
±5%  
0.62  
±5%  
±5%  
Avg idle current DCX  
Maximum starting current  
(peak DC) DC  
(peak AC) AC  
[1] [7]  
0.66  
0.69  
3σ [3]  
3σ [3]  
0.83  
0.99  
0.55  
1.59  
3.43  
0.03  
0.93  
1.11  
0.58  
1.58  
3.30  
0.03  
0.98  
1.16  
0.62  
1.59  
3.36  
0.03  
Delayed motor start (max) DC 3σ [1] [4]  
Peak operating current:  
Typical DCX  
[1] [6]  
3σ [1]  
3σ  
0.77  
0.81  
1.26  
0.87  
0.89  
2.64  
0.81  
0.85  
1.31  
0.86  
0.88  
2.54  
0.84  
0.88  
1.35  
0.87  
0.88  
2.59  
Maximum DC  
Maximum (peak) DC  
[1] Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these val-  
ues. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.  
[2] For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching  
14,904 RPM. 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 +12V current profile in Figure 2.  
[4] This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start  
Motor command.  
[5] See paragraph 6.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and  
transient response.  
[6] Operating condition is defined as random 8 block reads at 225 I/Os per second for ST3146954FC models  
26  
Cheetah 15K.4 FC Product Manual, Rev. B  
       
and 230 I/Os per second for ST373554FC andST336854FC models. Current and power specified at nom-  
inal voltages. Decreasing +5 volt supply by 5% increases 5 volt current by 2.5%. Decreasing +12 volt sup-  
ply by 5% increases 12 volt current by 3.0% (2% for ST373554FC and ST336854FC models).  
[7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from  
three-quarters to maximum track.  
General DC power requirement notes.  
1. Minimum current loading for each supply voltage is not less than 1.2% of the maximum operating current  
shown.  
2. The +5V and +12V supplies should 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  
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.  
6.2.1  
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.  
6.2.2  
Power sequencing  
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up  
and down.  
6.2.3  
Current profiles  
The +12V and +5V current profiles for the ST3146954FC, ST373554FC, and ST336854FC models are shown  
below in the following figures.  
Note: All times and currents are typical. See Table 2 for maximum current requirements.  
Cheetah 15K.4 FC Product Manual, Rev. B  
27  
             
Figure 2.  
Typical ST3146954FC drive, 2 Gbit, +12V current profile  
Figure 3.  
Typical ST3146954FC drive, 2 Gbit, +5V current profile  
28  
Cheetah 15K.4 FC Product Manual, Rev. B  
   
Figure 4.  
Typical ST373554FC drive +12V current profile  
Figure 5.  
Typical ST373554FC drive +5V current profile  
Cheetah 15K.4 FC Product Manual, Rev. B  
29  
   
Figure 6.  
Typical ST336854FC drive +12V current profile  
Figure 7.  
Typical ST336854FC drive +5V current profile  
30  
Cheetah 15K.4 FC Product Manual, Rev. B  
   
6.3  
Power dissipation  
ST3146954FC  
Typical power dissipation under idle conditions in 2Gb operation is 13.96 watts (47.6 BTUs per hour).  
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure  
8). 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.  
ST3146854FC DC CURRENT/POWER vs THROUGHPUT (2 Gb)  
Random 8 Block Reads  
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  
20.00  
18 . 0 0  
16 . 0 0  
14 . 0 0  
12 . 0 0  
10 . 0 0  
8.00  
5Volt A  
12 V o l t A  
Watts  
6.00  
4.00  
0.0  
50.0  
100.0  
150.0  
200.0  
250.0  
300.0  
350.0  
400.0  
I/Os per Second  
Figure 8.  
ST3146954FC DC current and power vs. input/output operations per second  
Cheetah 15K.4 FC Product Manual, Rev. B  
31  
     
ST373554FC  
Typical power dissipation under idle conditions in 2Gb operation is 11.49 watts (39.21 BTUs per hour).  
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure  
8). 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.  
ST373454Specification random 8 block read, 2Gb  
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  
5Volt A  
12 V o l t 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 9.  
ST373554FC DC current and power vs. input/output operations per second  
32  
Cheetah 15K.4 FC Product Manual, Rev. B  
 
ST336854FC  
Typical power dissipation under idle conditions in 2Gb operation is 9.88 watts (33.7 BTUs per hour).  
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure  
8). 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.  
ST336754FC Specification random 8 block read  
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  
5Volt A  
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 10.  
ST336854FC DC current and power vs. input/output operations per second  
Cheetah 15K.4 FC Product Manual, Rev. B  
33  
 
6.4  
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).  
6.4.1  
Temperature  
a. Operating  
The maximum allowable continuous or sustained HDA case temperature for the rated MTBF is 122°F  
(50°C) The maximum allowable HDA case temperature is 60°C. Occasional excursions of HDA case tem-  
peratures above 122°F (50°C) or below 41°F (5°C) may occur without impact to specified MTBF. Continual  
or sustained operation at HDA case temperatures outside these limits may degrade MTBF.  
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 11. Locations of the HDA temperature check point  
6.4.2 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 20% per hour.  
b. Non-operating  
5% to 95% non-condensing relative humidity.  
34  
Cheetah 15K.4 FC Product Manual, Rev. B  
                               
6.4.3  
Effective altitude (sea level)  
a. Operating  
–1,000 to +10,000 feet (–305 to +3,048 meters)  
b. Non-operating  
–1,000 to +40,000 feet (–305 to +12,210 meters)  
6.4.4  
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 12, and in accordance with the restrictions of Section 8.5. Orientation of the  
side nearest the LED may be up or down.  
6.4.4.1  
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 65 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 nonrepetitve shock not exceeding 100 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.  
Cheetah 15K.4 FC Product Manual, Rev. B  
35  
                   
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)  
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 12. Recommended mounting  
36  
Cheetah 15K.4 FC Product Manual, Rev. B  
       
6.4.4.2  
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  
5-500 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 - 400 Hz  
0.4 g RMS  
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  
5-500 Hz @ 0.75 G (X, Y, or Z axis)  
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. This assumes system recovery routines are available.  
Operating abnormal translational random flat profile  
10 - 400 Hz  
1.2 g RMS  
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 - 400 Hz  
1.2 g RMS  
6.4.5  
Air cleanliness  
The drive is designed to operate in a typical office environment with minimal environmental control.  
6.4.6  
Acoustics  
Sound power during idle mode shall be 3.6 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.  
6.4.7  
Electromagnetic susceptibility  
See Section 2.1.1.1.  
Cheetah 15K.4 FC Product Manual, Rev. B  
37  
                             
6.5  
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 Figure 13 for detailed mounting configuration dimensions.  
See Section 8.5, “Drive mounting.”  
Height:  
Width:  
Depth:  
Weight:  
1.000 in  
4.000 in  
5.75 in  
25.4 mm  
101.6 mm  
146.05 mm  
0.68 kilograms  
1.5 pounds  
B
J
H
L
K
// T -Z-  
REF  
S
-Z-  
[1]  
R REF  
Notes:  
[1]  
N -X-  
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
-Z-  
C
M
-X-  
U -X-  
Dimension Table  
Inches  
Millimeters  
P
A
B
C
D
E
F
H
J
K
L
M
N
P
R
S
T
1.028 max  
5.787 max  
4.000 ± .010  
3.750 ± .010  
0.125 ± .010  
1.750 ± .010  
1.122 ± .020  
4.000 ± .010  
0.250 ± .010  
1.638 ± .010  
0.181  
.040  
1.625 ± .020  
1.618  
0.276 ± .040  
.015 max  
.015 max  
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  
1.02  
41.28 ± .50  
41.10  
7.00 ± 1.02  
0.38 max  
0.38 max  
F
[1]  
U
E
D
Figure 13. Mounting configuration dimensions  
38  
Cheetah 15K.4 FC Product Manual, Rev. B  
             
7.0  
Defect and error management  
The drive, as delivered, complies with this product manual. The read error rates and specified storage capaci-  
ties are not dependent upon use of defect management routines by the host (initiator).  
Defect and error management in the SCSI protocol involves the drive internal defect/error management and  
FC-AL system error considerations (errors in communications between the initiator and the drive). Tools for  
use in designing a defect/error management plan are briefly outlined in this section. References to other sec-  
tions are provided when necessary.  
7.1  
Drive internal defects/errors  
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.  
Details of the SCSI commands supported by the drive are described in the Fibre Channel Interface Manual.  
Also, more information on the drive Error Recovery philosophy is presented in the Fibre Channel Interface  
Manual.  
7.2  
Drive error recovery procedures  
When an error occurs during drive operation, the drive, if programmed to do so, performs error recovery proce-  
dures to attempt to recover the data. The error recovery procedures used depend on the options previously set  
in the Error Recovery Parameters mode page. Error recovery and defect management may involve using sev-  
eral SCSI commands described in the Fibre Channel Interface Manual. The drive implements selectable error  
recovery time limits required in video applications.  
The error recovery scheme supported by the drive provides a way 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 using 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 using the Read Retry  
Count or Write Retry Count bytes in the Error Recovery mode page.  
The drive firmware error recovery algorithms consists of 11 levels for read recoveries and five levels for write.  
Each level may consist of multiple steps, where a step is defined as a recovery function involving a single re-  
read or re-write attempt. The maximum level used by the drive in LBA recovery is determined by the read and  
write retry counts.  
Cheetah 15K.4 FC Product Manual, Rev. B  
39  
           
Table 5 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. Reallocations  
are performed when the ARRE bit (for reads) or AWRE bit (for writes) is one, the RC bit is zero, and the recov-  
ery time limit for the command has not yet been met. Time needed to perform reallocation is not counted  
against the recovery time limit.  
When the RC bit is one, reallocations are disabled even if the ARRE or AWRE bits are one. The drive will still  
perform data recovery actions within the limits defined by the Read Retry Count, Write Retry Count, and  
Recovery Time Limit parameters. However, the drive does not report any unrecovered errors.  
40  
Cheetah 15K.4 FC Product Manual, Rev. B  
Table 5:  
Read and write retry count maximum recovery times [1]  
Read retry  
count  
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  
235.41  
271.32  
283.29  
315.21  
395.01  
454.86  
486.78  
522.69  
1,264.83  
2
55.86  
3
3
67.83  
4
4
119.7  
5
5 (default)  
147.63  
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 271.32 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.  
7.3  
FC-AL system errors  
Information on the reporting of operational errors or faults across the interface is given in the Fibre Channel  
Interface Manual. The FCP Response 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 Fibre Channel Interface Manual. Status reporting  
plays a role in systems error management and its use in that respect is described in sections where the various  
commands are discussed.  
Cheetah 15K.4 FC Product Manual, Rev. B  
41  
 
7.4  
Background Media Scan  
Background Media Scan (BGMS) is a self-initiated media scan. It performs sequential reads across the entire  
pack of the media while the drive is idle. In RAID arrays, BGMS 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 BGMS Log Page, it can avoid placing data in suspect locations on the media. Unrecovered error sites  
found during BGMS will be logged and recovered error sites will be logged or reallocated per ARRE/AWRE  
settings.  
With BGMS, the host system can consume less power and system overhead by only checking BGMS status/  
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, BGMS causes a negligible impact to  
system performance. Background media scan will begin after 500ms of idle time. Other features that normally  
use idle time to function will function normally because BGMS functions for bursts of 800ms and then sus-  
pends activity to allow other background functions to operate. Additionally, BGMS operates in segments of 400  
block reads, checking for host commands upon completion of each of the block segments.  
The BGMS function will complete any BGMS-initiated error recovery prior to returning to service host-initiated  
commands. Overhead associated with a return to host-servicing activity from BGMS only impacts the first com-  
mand that interrupted BGMS. This results in a typical delay of about 4 ms.  
7.4.1  
Media Pre-Scan  
Media Pre-Scan is an optional feature that allows the drive to handle unrecovered media errors that would oth-  
erwise have been found by the host system during critical data accesses early in the integration process at  
customer sites. This should reduce integration DPPM (defective parts per million) by identifying and repairing  
media errors that arose during shipping and handling. Media Pre-Scan replaces all host-initiated Write com-  
mands with Write-Verify commands when the drive is accessing areas of the media yet untouched by BGMS-  
initiated scanning activity.  
The drive will attempt to run BGMS on the entire pack of the drive. This will result in increasingly large portions  
of the drive having been accessed, provided there is adequate idle time to allow BGMS to run. During the Pre-  
Scan period, all Write commands that are in areas not yet scanned by BGMS are converted to Write-Verify  
commands. To expedite the scan of the full pack and the subsequently exit from the Pre-Scan period, BGMS  
will begin immediately when the drive goes to idle during the Pre-Scan period, as opposed to waiting 500ms as  
is done under non-Pre-Scan conditions.  
42  
Cheetah 15K.4 FC Product Manual, Rev. B  
           
8.0  
Installation  
Cheetah 15K.4 FC disc drive installation is a plug-and-play process. There are no jumpers, switches, or termi-  
nators on the drive. Simply plug the drive into the host’s 40-pin Fibre Channel backpanel connector (FC-  
SCA)no cables are required. See Section 9.5 for additional information about this connector.  
Use the FC-AL interface to select drive ID and all option configurations for devices on the loop.  
If multiple devices are on the same FC-AL and physical addresses are used, set the device selection IDs (SEL  
IDs) on the backpanel so that no two devices have the same selection ID. This is called the hard assigned arbi-  
trated loop physical address (AL_PA). There are 125 AL_PAs available (see Table 27). If you set the AL_PA on  
the backpanel to any value other than 0, the device plugged into the backpanel’s SCA connector inherits this  
AL_PA. In the event you don’t successfully assign unique hard addresses (and therefore have duplicate selec-  
tion IDs assigned to two or more devices), the FC-AL generates a message indicating this condition. If you set  
the AL_PA on the backpanel to a value of 0, the system issues a unique soft-assigned physical address auto-  
matically.  
Loop initialization is the process used to verify or obtain an address. The loop initialization process is per-  
formed when power is applied to the drive, when a device is added or removed from the Fibre Channel loop, or  
when a device times out attempting to win arbitration.  
• Set all option selections in the connector prior to applying power to the drive. If you change options after  
applying power to the drive, recycle the drive power to activate the new settings.  
• It is not necessary to low-level format this drive. The drive is shipped from the factory low-level formatted in  
512-byte logical blocks. You need to reformat the drive only if you want to select a different logical block size.  
8.1  
Drive ID/option selection  
All drive options are made through the interface connector (J1). Table provides the pin descriptions for the 40-  
pin Fibre Channel single connector (J1).  
Cheetah 15K.4 FC Product Manual, Rev. B  
43  
                                       
8.2  
LED connections  
A connector, J6, is provided on the printed circuit board assembly (PCBA) to provide port bypass, drive active,  
and drive fault LED connections (see Figure 15). See Sections 9.5.7, 9.5.8, and 9.5.9 for descriptions of LED  
functions.  
J6  
Figure 14.  
Physical interface  
Drive  
Front  
Pin 1  
J6  
Reserved  
Port A Bypass LED [1]  
Port B Bypass LED [1]  
Fault LED [1]  
Reserved  
Active LED [2]  
Reserved  
+5V  
Active LED [1]  
Ground [3]  
[1] The drive has a 2.2K ohm resistor in series with this LED driver. Tie the minus side of an external high-effi-  
ciency LED (i.e., 2ma) to this pin. Connect the plus side of the LED to +5V.  
[2] An external current-limiting resistor is required when connecting an LED to this pin. The minus side of the  
resistor/LED combination is connected to this pin. Connect the plus side to +5V.  
[3] Jumper storage location (across pins 2 and 4).  
Figure 15.  
LED indicator connector  
44  
Cheetah 15K.4 FC Product Manual, Rev. B  
             
8.2.1  
J6 connector requirements  
Recommended mating connector part number: Berg receptacle, 6-position, Berg part number 690-006.  
8.3  
Drive orientation  
The drive may be mounted in any orientation. All drive performance characterizations, however, have been  
done with the drive in horizontal (discs level) and vertical (drive on its side) orientations, which are the two pre-  
ferred mounting orientations.  
8.4  
Cooling  
The host enclosure must dissipate heat 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 Section 6.4.1. In  
some cases, forced airflow may be required to keep temperatures at or below the temperatures specified in  
Section 6.4.1.  
If forced air is necessary, possible air-flow patterns are shown in Figure 16. 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 6.4.1 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 16.  
Air flow  
Cheetah 15K.4 FC Product Manual, Rev. B  
45  
                       
8.5  
Drive mounting  
Mount the drive using the bottom or side mounting holes. If you mount the drive using the bottom holes, ensure  
that you do not physically distort the drive by attempting to mount it on a stiff, non-flat 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 X = F < 15lb = 67N  
where K is the mounting surface stiffness (units in lb/in or N/mm) and X is the out-of-plane surface distortion  
(units in 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 given herein 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.  
8.6  
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.  
46  
Cheetah 15K.4 FC Product Manual, Rev. B  
                         
9.0  
Interface requirements  
This section partially describes the interface requirements as implemented on Cheetah 15K.4 FC drives. Addi-  
tional information is provided in the Fibre Channel Interface Manual (part number 77767496).  
9.1  
FC-AL features  
This section lists the Fibre Channel-specific features supported by Cheetah 15K.4 FC drives.  
9.1.1  
Fibre Channel link service frames  
Table 6 lists the link services supported by Cheetah 15K.4 FC drives.  
Table 6:  
Link services supported  
Type of frame  
Link service  
Basic link service frames  
Basic link service reply frames  
Abort Sequence (ABTS)  
Basic_Accept (BA_ACC)  
Basic_Reject (BA_RJT)  
Extended link service frames  
N_Port Login (PLOGI)  
Fabric Login (FLOGI)  
Logout (LOGO)  
Process Login (PRLI)  
Process Logout (PRLO)  
Read Link Status (RLS)  
Fabric Address Notification (FAN)  
Port Discovery (PDISC)  
Address Discovery (ADISC)  
Third-party Process Logout (TRPLO)  
Extended link service reply frames  
Fibre Channel Services  
Accept (ACC)  
Link Service Reject (LS_RJT)  
Register FC-4 Types (RFT_ID)  
Cheetah 15K.4 FC Product Manual, Rev. B  
47  
                                                   
9.1.2  
Fibre Channel task management functions  
Table 7 lists the Fibre Channel SCSI Fibre Channel Protocol (FC SCSI FCP) task management functions sup-  
ported.  
Table 7:  
Fibre Channel SCSI FCP task management functions  
Supported  
Task name  
Terminate task  
Clear ACA  
No  
Yes  
Yes  
Yes  
Yes  
Target reset  
Clear task set  
Abort task set  
9.1.3  
Fibre Channel task management responses  
Table 8 lists the FC SCSI FCP response codes returned for task management functions supported.  
Table 8:  
FC SCSI FCP response codes  
Function name  
Response code  
Function complete  
Function not supported  
Function reject  
00  
04  
05  
48  
Cheetah 15K.4 FC Product Manual, Rev. B  
                         
9.1.4  
Fibre Channel port login  
Table 9 identifies the required content of the N_Port Login (PLOGI) payload from an initiator.  
Table 9:  
Bytes  
N_Port login (PLOGI) payload  
0-15  
03  
00  
00  
00  
09  
09  
BB  
PN  
BB  
PN  
CF  
PN  
XX  
PN  
FS  
PN  
FS  
PN  
XX  
NN  
XX  
NN  
XX  
NN  
XX  
NN  
Common  
16-31  
32-35  
36-47  
48-51  
52-63  
64-67  
68-79  
80-83  
84-95  
96-99  
100-111  
112-115  
XX  
NN  
XX  
NN  
XX  
NN  
XX  
NN  
PN  
PN  
XX  
XX  
SO  
XX  
XX  
XX  
XX  
SO  
XX  
XX  
XX  
XX  
IC  
XX  
XX  
IC  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
FS  
XX  
XX  
XX  
XX  
FS  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
CS  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
Class 1  
Class 2  
Class 3  
Reserved  
XX  
XX  
OS  
XX  
XX  
XX  
XX  
OS  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
Vendor  
Version  
X
Indicates a four-bit (hex) field is not checked.  
Indicates a single bit is not checked.  
x
BB  
CF  
BB-Credit. This field is not checked. The FC-AL drive uses BB-Credit of zero (0).  
Common features. This binary field selects the common features requested by the initiator login.  
MSB  
Continuously increasing offset  
Random relative offset  
Valid version level  
Must = 1  
Not checked. Port Login Accept will return a 0—not supported.  
x
N_Port/F_Port  
Must = 0, N_Port  
Must = 1  
Alternate credit model  
Other bits reserved  
xxx XX  
FS  
PN  
Receive buffer field size. The FS field in the common and Class 3 parameters is checked for the range 128 < FS < 2,112 and a  
multiple of four bytes. For multiple frame sequences, all frames but the last frame of the sequence must be this size. Only the  
receive buffer field size in the Class 3 parameters is used.  
Port name (initiator’s)—saved with the login parameters. If a change of the port name/AL_PA address association is detected  
during a Port DISCovery, and implicit logout occurs and the initiator returns a LS_RJT.  
NN  
SO  
Node name. The node name is not checked or saved by the drive.  
Service options Class 3 only.  
MSB  
Class valid  
Must = 1  
Intermix  
x
Stacked connection req.  
Sequential delivery  
Other bits reserved  
xx  
x
xxx XX  
IC  
Initiator control  
MSB XID reassign  
xx  
Proc Assc  
Other bits  
10 or 11 causes the login to be rejected. Other values are accepted.  
XXX  
CS  
OS  
Concurrent sequences  
Must be a value greater than 0.  
Must be a value greater than 0.  
Open sequences per exchange  
Cheetah 15K.4 FC Product Manual, Rev. B  
49  
                                                                   
9.1.5  
Fibre Channel port login accept  
Table 10 identifies the N_Port Login access payload values.  
Table 10:  
Bytes  
N_Port Login Accept (ACC) payload  
0-15  
02  
00  
CC  
00  
00  
UI  
00  
01  
UI  
00  
F4  
UI  
09  
2P  
09  
00  
00  
00  
00  
88  
00  
UI  
FS  
UI  
FS  
UI  
00  
20  
FF  
00  
00  
00  
01  
Common  
16-31  
32-35  
36-47  
48-51  
52-63  
64-67  
68-79  
80-83  
84-95  
96-99  
100-111  
112-115  
CC  
CC  
CC  
00  
00  
80  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
FS  
00  
00  
00  
00  
FS  
00  
00  
00  
00  
00  
00  
00  
00  
00  
FF  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
Class 1  
Class 2  
Class 3  
Reserved  
00  
00  
00  
00  
00  
00  
00  
01  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
Vendor -  
Version  
CC  
FS  
UI  
Bytes (23 and 24) and (31 and 32) are currently factory set to 04 CF respectively (subject to change).  
Receive buffer field size. The drive returns and uses the receive buffer size from the N_Port Login Class 3 receive buffer.  
Unique identifier. This 24-bit field is uniquely assigned to the drive. This same UI appears in the Port Name and Node Name  
fields.  
P
Byte port identifier field.  
1
2
P_LOGI received on Port A.  
P_LOGI received on Port B.  
9.1.6  
Fibre Channel Process Login  
Table 11 lists the process login payload data.  
Table 11:  
Process Login (PLRI) payload  
Bytes  
0-15  
20  
00  
10  
00  
00  
00  
14  
22  
08  
00  
20  
00  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
XX  
16-19  
XX  
Indicates fields that are not used.  
50  
Cheetah 15K.4 FC Product Manual, Rev. B  
                               
9.1.7  
Fibre Channel Process Login Accept  
Table 12 lists Cheetah 15K.4 FC process login accept payload data.  
Table 12:  
Process Login Accept (ACC) payload  
Bytes  
0-15  
02  
00  
10  
00  
00  
00  
14  
12  
08  
00  
21  
00  
00  
00  
00  
00  
00  
00  
00  
00  
16-31  
9.1.8  
Fibre Channel fabric login  
Table 13 lists the fabric login payload from the drive.  
Table 13:  
Fabric Login (FLOGI) payload  
Bytes  
0-15  
04  
00  
00  
00  
00  
02  
UI  
00  
F4  
UI  
09  
2P  
09  
00  
00  
00  
00  
08  
00  
08  
40  
00  
00  
00  
00  
00  
00  
Common  
16-31  
32-35  
36-47  
48-51  
52-63  
64-67  
68-79  
80-83  
84-95  
96-99  
100-111  
CC CC UI  
UI  
00  
00  
08  
00  
00  
UI  
00  
00  
40  
00  
00  
02  
00  
00  
00  
00  
00  
CC  
CC UI  
00  
00  
80  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
Class 1  
Class 2  
Class 3  
Reserved  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
00  
Vendor -  
Version  
112-115 00  
CC  
UI  
Bytes (23 and 24) and (31 and 32) are currently factory set to 04 CF respectively (subject to change).  
Unique identifier. This 24-bit field is uniquely assigned to the drive. This same UI appears in the Port Name and Node Name  
fields.  
P
Port identifier field.  
1
2
FLOGI originated on Port A.  
FLOGI originated on Port B.  
Cheetah 15K.4 FC Product Manual, Rev. B  
51  
                       
9.1.9  
Fibre Channel fabric accept login  
Table 14 lists the required content of the Fabric Login Accept (ACC) payload from the fabric.  
Table 14:  
Fabric Login Accept (ACC) payload  
Bytes  
0-15  
02  
E_  
00  
00  
00  
V_  
09  
09  
BB BB CF XX FS FS R_ A_  
T0  
V_  
Common  
16-31  
32-35  
36-47  
48-51  
52-63  
64-67  
68-79  
80-83  
84-95  
96-99  
100-111  
D_ T0  
PN PN PN PN PN PN PN PN NN NN NN NN  
NN NN NN NN  
XX XX XX XX  
XX XX XX XX  
OS OS XX XX  
XX XX XX XX  
XX XX XX XX XX XX XX XX XX XX XX XX Class 1  
XX XX XX XX XX XX XX XX XX XX XX XX Class 2  
SO SO xx  
xx  
XX XX FS FS XX xx  
XX XX Class 3  
XX XX XX XX XX XX XX XX XX XX XX XX Reserved  
XX XX XX XX XX XX XX XX XX XX XX XX Vendor -  
Version  
112-115 XX XX XX XX  
X
Indicates a four-bit (hex) field is not checked.  
x
Indicates a single bit is not checked.  
BB  
CF  
BB-Credit. This field is not checked. The FC-AL drive uses BB-Credit of zero (0).  
Common features. This binary field selects the common features requested by the fabric login.  
MSB  
Continuously increasing offset  
Random relative offset  
Valid version level  
x
x
x
N_Port/F_Port  
Must = 1, F_Port  
Must = 1  
Alternate credit model  
Other bits reserved  
xxx XX  
FS  
PN  
Receive buffer field size. The FS field in the common and Class 3 parameters is checked for the range 128 < FS < 2,112 and a  
multiple of four bytes. The receive buffer field size in the Class 3 parameters is used. The drive uses the lower FS of Fabric  
Login Accept or N_Port Login when sending frames to an initiator.  
Port Name. The fabric port name is saved with the login parameters. If a change of the port name is detected during a FAN, an  
implicit logout occurs and a LS_RJT is returned to the fabric.  
NN  
SO  
Node Name. The drive does not check or save the node name.  
Service Options—Class 3 only.  
MSB  
Class valid  
Must = 1  
x
Intermix  
Stacked connection req.  
Sequential delivery  
Other bits reserved  
xx  
Must = 1  
xxx XX  
52  
Cheetah 15K.4 FC Product Manual, Rev. B  
                                                   
9.1.10  
Fibre Channel Arbitrated Loop options  
Table 15 lists the FC-AL options supported by Cheetah 15K.4 FC drives.  
Table 15:  
Option  
FC-AL options supported  
Supported  
OPEN Half Duplex  
OPEN Full Duplex  
Private Loop  
Accepted from another device.  
Sent to open another device. Accepted from another device.  
Yes  
Yes  
No  
Public Loop  
Old Port State  
Loop Position  
Yes  
Yes  
Loop Position Report  
9.2  
Dual port support  
Cheetah 15K.4 FC drives have two independent FC-AL ports. These ports may be connected on independent  
loops or on the same loop. Port A and Port B may be connected in any order or combination.  
• If both ports are connected on independent loops and hard addressing is used, the drive interface address is  
selected through the interface connector, both ports will seek the same loop address. If no conflict, both  
ports will have the same loop address.  
• If both ports are connected in the same loop and hard addressing is used, at least one port will attempt tak-  
ing a soft address to prevent an address conflict.  
Note. When a Cheetah 15K.4 FC drive is connected in loops with previous Seagate FC drive products:  
Barracuda 4LP FC (ST32171FC, ST34371FC, and ST34571FC)  
Barracuda 9FC (ST19171FC)  
Cheetah 4LP FC (ST34501FC)  
Cheetah 9FC (ST19101FC)  
the connection of Port A and B for these products must follow the requirements in their product manu-  
als.  
Subject to buffer availability, the Cheetah 15K.4 FC drives support:  
• Concurrent port transfers—The drive supports receiving transfers on both ports at the same time when the  
ports are on independent loops.  
• Full duplex—The drive supports sending FCP_Data, FCP_RSP, FCP_XFR_RDY and ELS transfers while  
receiving frames on both ports.  
Cheetah 15K.4 FC Product Manual, Rev. B  
53  
                     
9.3  
SCSI commands supported  
Table 16 lists the SCSI commands supported by Cheetah 15K.4 FC drives.  
Table 16: Supported commands  
Command code  
Supported [4] Command name  
00h  
01h  
03h  
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
N
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Test unit ready  
Rezero unit  
Request sense  
Extended sense  
Field pointer bytes  
Actual retry count bytes  
Format unit [1]  
04h  
07h  
08h  
0Ah  
0Bh  
12h  
Reassign blocks  
Read  
Write  
Seek  
Inquiry  
Vital product data page (00h)  
Unit serial number page (80h)  
Implemented operating def. page (81h)  
Device Identification page (83h)  
Firmware numbers page (C0h)  
Date code page (C1h)  
Jumper settings page (C2h)  
Device Behavior page (C3h)  
Mode select (same pages as Mode Sense command shown below) [3]  
Reserve  
15h  
16h  
3rd party reserved  
Extent reservation  
17h  
18h  
1Ah  
Release  
Copy  
Mode sense  
Unit attention page (00h)  
Error recovery page (01h)  
Disconnect/reconnect control (page 02h)  
Format page (03h)  
Rigid disc drive geometry page (04h)  
Verify error recovery page (07h)  
Caching parameters page (08h)  
54  
Cheetah 15K.4 FC Product Manual, Rev. B  
                                                                   
Table 16:  
Supported commands (continued)  
Command code  
Supported [4] Command name  
Control mode page (0Ah)  
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
Y
Y
N
Y
Y
Y
Y
N
Y
Y
Y
N
N
N
N
N
N
Y
N
Fibre Channel Interface Control page (19h)  
Power control page (1Ah)  
Information exceptions control page (1Ch)  
Start unit/stop unit  
Receive diagnostic results  
Supported diagnostics pages  
Translate page  
1Bh  
1Ch  
Enclosure services page  
Send diagnostics page  
Supported diagnostics pages  
Translate page  
1Dh  
25h  
28h  
Read capacity  
Read extended  
Disable page out  
Force unit access  
Relative address  
2Ah  
Write extended  
Disable page out  
Force unit access  
Relative address  
2Bh  
2Eh  
Seek extended  
Write and verify  
Disable page out  
Byte check  
Relative address  
2Fh  
Verify  
Disable page out  
Byte check  
Relative address  
30h  
31h  
32h  
33h  
34h  
35h  
36h  
Search data high  
Search data equal  
Search data low  
Set limits  
Prefetch  
Synchronize cache  
Lock-unlock-cache  
Cheetah 15K.4 FC Product Manual, Rev. B  
55  
                                                     
Table 16:  
Supported commands (continued)  
Command code  
Supported [4] Command name  
37h  
39h  
3Ah  
3Bh  
Y
N
N
Y
Y
Y
N
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
N
N
N
Y
Y
Y
Y
Y
N
Y
Y
Y
N
Y
Y
Y
N
N
Read defect data  
Compare  
Copy and verify  
Write buffer  
Write combined header and data mode (0)  
Write data mode (2)  
Download microcode mode (4)  
Download microcode and save modes (5)  
Download microcode with offsets mode (6)  
Download microcode with offsets and save mode (7)  
Firmware download option [2]  
Read buffer  
3Ch  
Read combined header and data mode (0)  
Read data mode (2)  
Read descriptor mode (3)  
Read long  
3Eh  
3Fh  
40h  
41h  
Write long  
Change definition  
Write same  
PBdata  
LBdata  
42-4Bh  
4Ch  
Not used  
Log Select  
4Dh  
Log Sense  
Support Log page (00h)  
Write Error Counter page (02h)  
Read Error Counter page (03h)  
Read Reverse Error Counter page (04h)  
Verify Error Counter page (05h)  
Non-medium Error Counter page (06h)  
Temperature page (0Dh)  
Application Client page (0Fh)  
Self Test Results page (10h)  
Cache Statistics Counter page (37h)  
Factory Log page (3Eh)  
Not used  
4E-4Fh  
50h  
XD write  
56  
Cheetah 15K.4 FC Product Manual, Rev. B  
                                               
Table 16:  
Supported commands (continued)  
Command code  
Supported [4] Command name  
51h  
N
N
N
Y
Y
Y
N
Y
N
Y
N
A
A
N
N
N
N
N
Y
N
N
XP write  
52h  
XD read  
53-54h  
55h  
Not used  
Mode Select (10) [3]  
Reserved (10)  
3rd party reserve  
Extent reservation  
Released (10)  
Not used  
56h  
57h  
58-59h  
5Ah  
Mode Sense (10) [3]  
Not used  
5B-5Dh  
5E  
Persistent reserve in  
Persistent reserve out  
Not used  
5F  
60-7Fh  
80h  
XD write extended  
Rebuild  
81h  
82h  
Regenerate  
83-8Fh  
A0h  
Not used  
Report LUNS  
Not used  
C0-DFh  
EO-FFh  
Not used  
[1] Cheetah 15K.4 FC drives can format to any multiple of four bytes per logical block in the range 512 to 704  
bytes.  
[2] Warning. Power loss during flash programming can result in firmware corruption. This usually makes the  
drive inoperable.  
[3] Reference Mode Sense command 1Ah for mode pages supported.  
[4] Y = Yes. Command is supported.  
N = No. Command is not supported.  
A = Support is available on special request.  
Cheetah 15K.4 FC Product Manual, Rev. B  
57  
                     
9.3.1  
Inquiry data  
Table 17 lists the Inquiry command data that the drive should return to the initiator per the format given in the  
Fibre Channel Interface Manual.  
Table 17:  
Bytes  
Cheetah 15K.4 FC inquiry data  
Data (hex)  
0-15  
00  
[53  
R#  
00  
00  
00  
00  
00  
54  
R#  
00  
00  
00  
43  
03** 12  
8B  
34  
S#  
00  
00  
00  
79  
53  
74  
00  
36  
S#  
00  
00  
00  
72  
65  
73  
PP  
39  
S#  
00  
00  
00  
69  
61  
20  
0A  
35  
S#  
00  
00  
00  
67  
67  
72  
53  
34  
S#  
00  
00  
00  
68  
61  
65  
45  
46  
S#  
00  
00  
00  
74  
74  
73  
41  
43]1 20  
47  
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  
Vendor ID  
Product ID  
16-31  
32-47  
48-63  
64-79  
80-95  
96-111  
112-127  
128-143  
33  
R#  
00  
00  
00  
6F  
31  
R#  
00  
00  
00  
70  
20  
68  
S#  
00  
00  
00  
20  
65  
65  
S#  
00  
00  
00  
28  
20  
72  
32* *Copyright  
30* 30* 32*  
72 69 67  
20  
20  
notice  
*
Copyright year (changes with actual year).  
**  
02 = SCSI-2 implemented with some SCSI-3 features (default).  
03 = SCSI-3 implemented.  
PP 50 = Inquiry data for an Inquiry command received on Port A.  
70 = Inquiry data for an Inquiry command received on Port B.  
R# Four ASCII digits representing the last four digits of the product firmware release number.  
S# Eight ASCII digits representing the eight digits of the product serial number.  
[ ]  
Bytes 18 through 26 reflect model of drive. The table above shows the hex values for Model ST3146954FC.  
Refer to the values below for the values of bytes 18 through 26 of you particular model:  
ST373554FC  
ST336854FC  
53 54 33 37 33 35 35 34 46 43  
53 54 33 33 36 38 35 34 46 43  
9.3.2  
Mode Sense data  
The Mode Sense command provides a way for the drive to report its operating parameters to the initiator. The  
drive maintains four sets of mode parameters:  
1. Default values  
Default values are hard-coded in the drive firmware stored in flash E-PROM (nonvolatile memory) on the  
drive’s PCB. These default values can be changed only by downloading a complete set of new firmware  
into the flash E-PROM. 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 change-  
able.  
2. Saved values  
Saved values are stored on the drive’s media using a Mode Select command. Only parameter values that  
are allowed to be changed can be changed by this method. Parameters in the saved values list that are not  
changeable by the Mode Select command get their values from default values storage.  
When power is applied to the drive, it takes saved values from the media and stores them as current val-  
ues in volatile memory. It is not possible to change the current values (or the saved values) with a Mode  
Select command before the drive achieves operating speed and is “ready.” An attempt to do so results in a  
“Check Condition” status.  
On drives requiring unique saved values, the required unique saved values are stored into the saved val-  
ues storage location on the media prior to shipping the drive. Some drives may have unique firmware with  
unique default values also.  
58  
Cheetah 15K.4 FC Product Manual, Rev. B  
       
On standard OEM drives, the saved values are taken from the default values list and stored into the saved  
values storage location on the media prior to shipping.  
3. Current values  
Current values are volatile values being used by the drive to control its operation. A Mode Select command  
can be used to change the values identified as changeable values. Originally, current values are installed  
from saved or default values after a power on reset, hard reset, or Bus Device Reset message.  
4. Changeable values  
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 (1) indicates the value can be  
changed. A zero (0) indicates the value is not changeable. For example, in Table 18, refer to Mode page  
81, in the row entitled “CHG.” These are hex numbers representing the changeable values for Mode page  
81. Note in columns 5 and 6 (bytes 04 and 05), there is 00h which indicates that in bytes 04 and 05 none of  
the bits are changeable. Note also that bytes 06, 07, 09, 10, and 11 are not changeable, because those  
fields are all zeros. In byte 02, hex value FF equates to the binary pattern 11111111. If there is a zero in any  
bit position in the field, it means that bit is not changeable. Since all of the bits in byte 02 are ones, all of  
these bits are changeable.  
The changeable values list can only be changed by downloading new firmware into the flash E-PROM.  
Note. Because there are often 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 implementation (see the Fibre Channel Interface Manual).  
Definitions:  
SAV = Current saved value.  
DEF = Default value. Standard OEM drives are shipped configured this way.  
CHG = Changeable bits; indicates if default value is changeable.  
Cheetah 15K.4 FC Product Manual, Rev. B  
59  
Table 18:  
Mode Sense data saved, default and changeable values for ST3146954FC drives  
MODE SENSE (10 BYTE) HEADER DATA  
00 ae 00 10 00 00 00 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 00 00 00 00 00 05 bc 00 00 00 00  
DEF 82 0e 80 80 00 00 00 00 00 00 05 bc 00 00 00 00  
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 00 00 00 00  
SAV 83 16 56 20 00 00 00 30 00 00 02 c2 02 00 00 01 00 aa 00 91 40 00 00 00  
DEF 83 16 56 20 00 00 00 30 00 00 02 c2 02 00 00 01 00 aa 00 91 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 00 c6 88 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00  
DEF 84 16 00 c6 88 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 00 20 00 00 00 00 00 00  
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 00 20 00 00 00 00 00 00  
CHG 88 12 b5 00 00 00 ff ff ff ff 00 00 a0 ff 00 00 00 00 00 00  
SAV 8a 0a 02 00 00 00 00 00 00 00 08 4d  
DEF 8a 0a 02 00 00 00 00 00 00 00 08 4d  
CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00  
SAV 99 06 00 00 00 00 00 00  
DEF 99 06 00 00 00 00 00 00  
CHG 99 06 00 ff 00 00 00 00  
SAV 9a 0a 00 02 00 00 00 05 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 b7 40 0f 00 00 00  
READ CAPACITY DATA  
11 17 73 2f 00 00 02 00  
60  
Cheetah 15K.4 FC Product Manual, Rev. B  
 
Table 19:  
Mode Sense data default and changeable values for ST373554FC drives  
MODE SENSE (10 BYTE) HEADER DATA  
00 ae 00 10 00 00 00 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 00 00 00 00 00 01 3c 00 00 00 00  
DEF 82 0e 80 80 00 00 00 00 00 00 01 3c 00 00 00 00  
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 00 00 00 00  
SAV 83 16 2b 10 00 00 00 18 00 00 02 c2 02 00 00 01 00 aa 00 91 40 00 00 00  
DEF 83 16 2b 10 00 00 00 18 00 00 02 c2 02 00 00 01 00 aa 00 91 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 00 c6 88 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00  
DEF 84 16 00 c6 88 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 14 00 ff ff 00 00 ff ff ff ff 00 20 00 00 00 00 00 00  
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 00 20 00 00 00 00 00 00  
CHG 88 12 b5 00 00 00 ff ff ff ff 00 00 a0 ff 00 00 00 00 00 00  
SAV 8a 0a 02 00 00 00 00 00 00 00 04 7e  
DEF 8a 0a 02 00 00 00 00 00 00 00 04 7e  
CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00  
SAV 99 06 00 00 00 00 00 00  
DEF 99 06 00 00 00 00 00 00  
CHG 99 06 00 ff 00 00 00 00  
SAV 9a 0a 00 02 00 00 00 05 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 b7 40 0f 00 00 00  
READ CAPACITY DATA  
08 8b b9 97 00 00 02 00  
Cheetah 15K.4 FC Product Manual, Rev. B  
61  
Table 20:  
Mode Sense data default and changeable values for ST336854FC drives  
MODE SENSE (10 BYTE) HEADER DATA  
00 ae 00 10 00 00 00 08 04 45 dc cc 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 00 00 00 00 00 01 3c 00 00 00 00  
DEF 82 0e 80 80 00 00 00 00 00 00 01 3c 00 00 00 00  
CHG 82 0e ff ff 00 00 00 00 00 00 ff ff 00 00 00 00  
SAV 83 16 15 88 00 00 00 0c 00 00 02 c2 02 00 00 01 00 f0 00 91 40 00 00 00  
DEF 83 16 15 88 00 00 00 0c 00 00 02 c2 02 00 00 01 00 f0 00 91 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 00 c6 88 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a a7 00 00  
DEF 84 16 00 c6 88 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 00 20 00 00 00 00 00 00  
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 00 20 00 00 00 00 00 00  
CHG 88 12 b5 00 00 00 ff ff ff ff 00 00 a0 ff 00 00 00 00 00 00  
SAV 8a 0a 02 00 00 00 00 00 00 00 02 5b  
DEF 8a 0a 02 00 00 00 00 00 00 00 02 5b  
CHG 8a 0a 03 f1 00 00 00 00 00 00 00 00  
SAV 99 06 00 00 00 00 00 00  
DEF 99 06 00 00 00 00 00 00  
CHG 99 06 00 ff 00 00 00 00  
SAV 9a 0a 00 02 00 00 00 05 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 b7 40 0f 00 00 00  
READ CAPACITY DATA  
04 45 dc cb 00 00 02 00  
62  
Cheetah 15K.4 FC Product Manual, Rev. B  
9.4  
Miscellaneous operating features and conditions  
Table 21 lists various features and conditions. A “Y” in the support column indicates the feature or condition is  
supported. An “N” in the support column indicates the feature or condition is not supported.  
Table 21:  
Miscellaneous features  
Supported  
Feature or condition  
Y
N
N
N
Y
N
Y
Y
Y
Y
N
Y
FC-AL selective reset (LIP Reset)  
Automatic contingent allegiance  
Asynchronous event notification  
Synchronized (locked) spindle operation  
Segmented caching  
Zero latency read  
Queue tagging (up to 128 queue tags supported)  
Deferred error handling  
Parameter rounding (controlled by Round bit in Mode Select page 0)  
Reporting actual retry count in Extended Sense bytes 15, 16, and 17  
Adaptive caching  
SMP = 1 in Mode Select command needed to save RPL and rotational offset bytes  
Table 22:  
Miscellaneous status  
Supported  
Status  
Y
Y
Y
Y
Y
Y
Y
Y
N
N
Good  
Check condition  
Condition met/good  
Busy  
Intermediate/good  
Intermediate/condition met/good  
Reservation conflict  
Task set full  
ACA active  
ACA active, faulted initiator  
Cheetah 15K.4 FC Product Manual, Rev. B  
63  
                                             
9.5  
FC-AL physical interface  
Figure 17 shows the location of the J1 Fibre Channel single connection attachment (FC-SCA) and the J6 con-  
nector. Figure 19 provides the dimensions of the FC-SCA connector. Figure 20 provides the dimensions of the  
J6 connector.  
Details of the physical, electrical, and logical characteristics are provided within this section. The operational  
aspects of Seagate’s Fibre Channel drives are provided in the Fibre Channel Interface Manual..  
J6  
Figure 17.  
9.5.1  
Physical interface  
Physical characteristics  
This section defines physical interface connector.  
9.5.1.1 Physical description  
FIbre Channel drives may be connected in a loop together or with other compatible FC-AL devices. A maxi-  
mum of 127 devices may have addresses; however, one of the addresses is reserved for a fabric port switch  
device. This means 126 addresses are available for FC-AL devices. More FC-AL compatible devices may  
physically reside on the loop, but they will not be functional because they would not be able to obtain valid  
addresses.  
Port bypass circuits (PBCs) allow devices to be inserted into unpopulated locations or removed from the loop  
with loop operation recovery after a brief interruption. These PBCs are located external to the FC-AL device.  
Figure 18 shows the relationship between the PBC and FC-AL device.  
Port Bypass  
Circuit  
From Previous  
Drive  
To Next  
Drive  
Port Bypass  
Circuit N–1  
Port Bypass  
Circuit N+1  
MUX  
Select  
Serial  
In  
Serial  
Out  
Drive N–1  
Drive N+1  
Drive N  
Figure 18.  
Port bypass circuit physical interconnect  
64  
Cheetah 15K.4 FC Product Manual, Rev. B  
                       
9.5.2  
Connector requirements  
Table 23:  
Recommended mating SCA part numbers  
Part description  
Positions  
Part number  
787317-1  
Features  
With polarization  
With polarization  
With polarization  
With polarization  
AMP Vertical (SCA sequence)  
40  
40  
40  
40  
Berg  
71781  
Methode  
Molex  
512-220-91-101N  
717431040  
The FC-AL SCA device connector is illustrated in Figure 19. The J6 connector is illustrated in Figure 20.  
1.618 ± .003 in  
(41.1 ± 0.08 mm)  
Pin 20  
Pin 40  
Pin 1  
0.197 ± .003 in  
(5.00 ± .08 mm)  
2 places  
Pin 21  
.64 in  
(16.24 mm)  
1.28 in  
(32.47 mm)  
0.394 ± .004 in  
(10.0 ± 0.10 mm)  
1.618 ± .003 in  
(41.10 ± 0.08 mm)  
0.226 in  
(6.50 mm)  
0.039 in  
min.  
min.  
(0.75 mm)  
0.264+.007 in  
–.010 in  
(6.71+0.18 mm)  
(–0.25 mm)  
1.492 ± .009 in  
(37.90 ± 0.24 mm)  
0.024 in  
(0.60 mm)  
min.  
Mating end  
Housing  
0.079 ± .010 in  
(2.00 ± .25 mm)  
(initial point  
of contact)  
.05 in  
(1.27 mm)  
Contact (typ.)  
.025 in (0.635 mm)  
typ.  
0.060 ± .010 in  
0.106 ± .010 in  
(1.52 ± 0.25 mm)  
(2.70 ± 0.25 mm)  
0.051 ± .006 in  
2 places  
(1.30 ± 0.16 mm)  
Figure 19.  
FC-AL SCA device connector dimensions  
.787  
(19.99 mm)  
.079 (2 mm)  
J6  
.079  
(2 mm)  
.708  
(17.983 mm)  
Figure 20.  
J6 connector dimensions  
Cheetah 15K.4 FC Product Manual, Rev. B  
65  
             
9.5.3  
Electrical description  
Fibre Channel drives use the FC-SCA connector for:  
• DC power  
• FC-AL interface  
• Drive select (device identification)  
• Option selection  
• Enclosure Services interface  
This 40-pin connector is designed to plug directly into a backpanel. External cables are not required.  
9.5.4  
This section provides a pin-out of the FC-SCA and a description of the functions provided by the pins.  
Table 24: FC-SCA pin descriptions  
Pin Signal name  
Pin descriptions  
Signal type  
Pin  
21  
Signal name  
12 Volts charge  
Ground  
Signal type  
1*  
2*  
3*  
4*  
5*  
6*  
7*  
8*  
9*  
-EN bypass port A  
Low Voltage TTL output  
12 Volts  
22  
12 Volts  
23  
Ground  
12 Volts  
24*  
25*  
26  
+Port A_in  
-Port A_in  
Ground  
FC Diff. input pair  
FC Diff. input pair  
FC Diff. output pair  
FC Diff. output pair  
-Parallel ESI  
[1]  
Ground  
Active LED out  
Reserved  
Open collector out  
27*  
28*  
29  
+Port B_in  
-Port B_in  
Ground  
[2]  
Start_1  
TTL input  
[2]  
10* Start_2  
TTL input  
30*  
31*  
32  
+Port A_out  
-Port A_out  
Ground  
11* -EN bypass port B  
12* SEL_6  
Low Voltage TTL output  
TTL input/output  
TTL input/output  
TTL input  
13* SEL_5  
33*  
34*  
35  
+Port B_out  
-Port B_out  
Ground  
14* SEL_4  
15* SEL_3  
TTL input/output  
Open collector out  
TTL input  
16* Fault LED out  
17* DEV_CTRL_CODE_2  
18* DEV_CTRL_CODE_1  
19* 5 Volts  
36  
SEL_2  
TTL input/output  
TTL input/output  
TTL input/output  
TTL input  
[2]  
[2]  
37  
SEL_1  
TTL input  
38  
SEL_0  
[2  
39  
DEV_CTRL_CODE_0  
5 Volts charge  
20* 5 Volts  
40  
*Short pins in mating backpanel connector.  
[1] This pin may be connected to external logic to detect the presence of the drive. The drive connects this  
pin to the common ground.  
[2] Pins 9, 10, 17, 18, and 39 are option select pins and are tied high by the drive circuitry. The preferred elec-  
trical 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.  
66  
Cheetah 15K.4 FC Product Manual, Rev. B  
                   
9.5.5  
FC-AL transmitters and receivers  
A typical FC-AL differential copper transmitter and receiver pair is shown in Figure 21. The receiver is required  
to provide the AC coupling to eliminate ground shift noise.  
50  
.01  
TX  
Transmitter  
TY  
RX  
Receiver  
RY  
Differential  
Transfer Medium  
100  
50  
.01  
Figure 21.  
9.5.6  
FC-AL transmitters and receivers  
Power  
Power is supplied through the FC-SCA with support for +5 volts and +12 volts. All of the voltage pins in the  
drive connector are the same length.  
Four 12 volt pins provide +12 volt power to the drive. The current return for the +12 volt power supply is  
through the common ground pins. The supply current and return current must be distributed as evenly as pos-  
sible among the pins. The maximum current typically occurs while the drive motor is starting.  
Three 5 volt pins provide logic power to the drive. The current return for the +5 volt power supply is through the  
common ground pins. Distribute supply and return current as evenly as possible among the voltage and  
ground pins.  
The mating connector pins use shorter contacts to achieve power surge reductions and to aid in “hot plugging”  
the drives. There are longer voltage contacts in the connector to enable the drive filter capacitors to charge.  
Current to the drive through the long charge pins is limited by the system in which the drive operates. Three of  
the +12 volt pins are shorter to allow capacitive pre-charging through the longer +12 volt charge pin. Two of the  
+5 volt pins are shorter to allow capacitive precharging through the longer +5 volt charge pin.  
9.5.7  
Fault LED Out  
The Fault LED Out signal is driven by the drive when:  
• the drive detects failure of both ports  
• the drive detects an internal failure  
• the drive receives the appropriate fault LED command from the host  
The Fault LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the proper  
+5 volt supply through an appropriate current-limiting resistor. The LED and the current-limiting resistor are  
external to the drive.  
Cheetah 15K.4 FC Product Manual, Rev. B  
67  
                           
9.5.8  
Active LED Out  
The Active LED Out signal is driven by the drive as indicated in Table 25.  
Table 25:  
Active LED Out conditions  
Normal command activity  
LED status  
Spun down and no activity  
Slow blink (20% on and 80% off a 2 sec cycle)  
Spun down and activity (command executing)  
Spun up and no activity  
On  
On  
Spun up and activity (command executing)  
Spinning up or down  
Off  
Blinks steadily (50% on and 50% off)  
Toggles on/off  
Format in progress, each cylinder change  
The Active LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the  
proper +5 volt supply through an appropriate current limiting resistor. The LED and the current limiting resistor  
are external to the drive.  
9.5.9  
Enable port bypass signals  
The – Enable Bypass Port A (– EN BYP Port A) and – Enable Bypass Port B (– EN BYP Port B) signals control  
the port bypass circuits (PBC) located external to the disc drive. The PBC allows a loop to remain functional in  
the event of a drive failure or removal. When these signals are active, low, the PBC bypasses the drive on the  
associated port. When an Enable Bypass signal is active, the corresponding Port Bypass LED signal in con-  
nector J1 is driven low by the disc drive. A pull down resistor, 1K, located with the PBC should be used to  
insure the bypass is enabled if the disc drive is not installed.  
The Enable Bypass signal is active under failing conditions within the drive, on detection of the Loop Port  
Bypass primitive sequence, or on removal of the drive. In the bypass state the drive continues to receive on the  
inbound fibre. Enable Bypass may be deactivated by detection of a Loop Port Enable primitive sequence if the  
drive has completed self-test and a hardware failure is not present.  
Failure modes detected by the disc drive that will enable bypass include:  
• Transmitter/receiver wrap test failure  
• Loss of receive clock  
• Loss of transmission clock  
• Drive interface hardware error  
9.5.10  
Motor start controls  
The drive’s motor is started according to the Start_1 and Start_2 signals described in Table 26. The state of  
these signals can be wired into the backplane socket or driven by logic on the backplane.  
Table 26:  
Motor start control signals  
Case  
Start_2  
Low  
Start_1  
Low  
Motor spin function  
1
2
3
Motor spins up at DC power on.  
High  
Low  
Motor spins up only when SCSI Start command is received.  
Low  
High  
Motor spins up after a delay of 12 seconds times the modulo 8 value  
of the numeric SEL ID of the drive from DC power on.  
4
High  
High  
The drive will not spin up.  
68  
Cheetah 15K.4 FC Product Manual, Rev. B  
                         
9.5.11  
SEL_6 through SEL_0 ID lines  
The SEL_6 through SEL_0 ID lines determine drive address, and, optionally, for an Enclosure Services Inter-  
face. When the Parallel ESI line is high, the enclosure backpanel must provide address information on the SEL  
line. Refer to table 27 for a mapping of SEL to FC-AL physical addresses (AL_PA). You can think of the SEL  
lines as the equivalent of a backpanel logic plug. The drives does not provide pull up resistors on these lines.  
The backpanel is required to provide high and low inputs to the SEL_ID lines per the specifications in table 29  
on page 71.  
Note. Table 27 gives AL_PA values for each SEL value. The first entry in the table is SEL_ID 00. The last  
entry is SEL_ID 7D. SEL_ID 7E is AL_PA 00 which is not valid for an NL_Port, so is not included in  
the table. Also, SEL_ID 7Fh does map to a valid AL_PA; however, this value signals the drive that  
physical addresses are not being assigned using the SEL lines and that a “soft” address will be  
determined by FC-AL loop initialization.  
When the Parallel ESI line is low, the enclosure backpanel logic switches to ESI mode if supported. There are  
two modes of ESI, seven bits of enclosure status and a bidirectional mode. ESI support and the mode are  
determined by the drive using a discovery process. Refer to the Fibre Channel Interface Manual for a descrip-  
tion of ESI operation.  
9.5.11.1  
Parallel Enclosure Services Interface (ESI)  
The parallel ESI line is an output from the drive. This line provides the enclosure with an indication of the  
present function of the SEL lines. A high level, the default state, indicates the drive requires address informa-  
tion on the SEL lines. A low level indicates the drive is attempting an ESI transfer. The enclosure may not sup-  
port ESI on any or all drive locations. It may only support the address function. Support of ESI is discovered by  
the drive. Refer to the Fibre Channel Interface Manual for a description of ESI operations.  
Cheetah 15K.4 FC Product Manual, Rev. B  
69  
   
Table 27:  
Arbitrated loop physical address (AL_PA) values  
AL_PA  
(hex)  
SEL ID  
(hex)  
Setting  
(dec)  
AL_PA  
(hex)  
SEL ID  
(hex)  
Setting  
(dec)  
AL_PA  
(hex)  
SEL ID  
(hex)  
Setting  
(dec)  
EF  
E8  
E4  
E2  
E1  
E0  
DC  
DA  
D9  
D6  
D5  
D4  
D3  
D2  
D1  
CE  
CD  
CC  
CB  
CA  
C9  
C7  
C6  
C5  
C3  
BC  
BA  
B9  
B6  
B5  
B4  
B3  
B2  
B1  
AE  
AD  
AC  
AB  
AA  
A9  
A7  
A6  
A5  
00  
01  
02  
03  
04  
05  
06  
07  
08  
09  
0A  
0B  
0C  
0D  
0E  
0F  
10  
11  
00  
01  
02  
03  
04  
05  
06  
07  
08  
09  
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  
41  
42  
A3  
9F  
9E  
9D  
9B  
98  
97  
90  
8F  
88  
84  
82  
81  
80  
7C  
7A  
79  
76  
75  
74  
73  
72  
71  
6E  
6D  
6C  
6B  
6A  
69  
67  
66  
65  
63  
5C  
5A  
59  
56  
55  
54  
53  
52  
51  
4E  
2B  
2C  
2D  
2E  
2F  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
3A  
3B  
3C  
3D  
3E  
3F  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
4A  
4B  
4C  
4D  
4E  
4F  
50  
51  
52  
53  
54  
55  
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  
81  
82  
83  
84  
85  
4D  
4C  
4B  
4A  
49  
47  
46  
45  
43  
3c  
3A  
39  
36  
35  
34  
33  
32  
31  
2E  
2D  
2C  
2B  
2A  
29  
27  
26  
25  
23  
1F  
1E  
1D  
1B  
18  
17  
10  
0F  
08  
04  
02  
01  
56  
57  
58  
59  
5A  
5B  
5C  
5D  
5E  
5F  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
6A  
6B  
6C  
6D  
6E  
6F  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
7A  
7B  
7C  
7D  
86  
87  
88  
89  
90  
91  
92  
93  
94  
95  
96  
97  
98  
99  
100  
101  
102  
103  
104  
105  
106  
107  
108  
109  
110  
111  
112  
113  
114  
115  
116  
117  
118  
119  
120  
121  
122  
123  
124  
125  
12  
13  
14  
15  
16  
17  
18  
19  
1A  
1B  
1C  
1D  
1E  
1F  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
2A  
70  
Cheetah 15K.4 FC Product Manual, Rev. B  
9.5.12  
Device control codes  
The drive inputs a Device Control Code on the DEV_CTRL_CODE lines at power up to determine the link rate  
on the Fibre Channel ports. Both ports run at the same rate. If the backpanel does not connect to these lines,  
the drive has 10K ohm pull up resistors that default the device control code to 7 (1.0625 GHz). Table lists the  
supported codes.  
Table 28:  
Device control code values  
1 (pin 18) 0 (pin 39)  
2 (pin 17)  
Definition  
0
0
0
0
0
1
1
1
1
0
1
0
1
0
1
0
1
Reserved for power failure warning.  
Reserved for auto negotiation of link rate.  
Reserved.  
0
1
1
0
0
1
1
Reserved.  
Reserved.  
4.250 GHz operation on both ports.  
2.125 GHz operation on both ports.  
1.0625 GHz operation on both ports.  
9.6  
Signal characteristics  
This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 24  
on page 66 for signal type and signal name information.  
9.6.1  
TTL input characteristics  
Table 29 provides the TTL characteristics.  
Table 29:  
TTL characteristics  
State  
Voltage  
Current  
Input high  
Input low  
1.9 < VIH < 5.5V  
-0.5V < VIL < 0.9V  
2.4 < VOH < 5.25V  
VOL < 0.5V  
IIH = ±500nA max.  
IOL = ±500nA max.  
IOH < -3mA  
Output high (-EN Bypass A, B)  
Output low (-EN Bypass A, B)  
Output high (-Parallel ESI)  
IOL < 3mA  
2.4 < VOH < 0.9 VCC  
VOH > 0.9VCC  
IOH < -2.4mA  
IOH < -500µA  
Output low (-Parallel ESI)  
0 < VOL < .45V  
IOL < 2.4mA  
Output high (all other outputs)  
2.4 < VOH < 0.9 VCC  
VOH > 0.9VCC  
IOH < -1.6mA  
IOH < -500µA  
Output low (all other outputs)  
0 < VOL < .45V  
IOL < 1.6mA  
Cheetah 15K.4 FC Product Manual, Rev. B  
71  
                     
9.6.2  
LED driver signals  
Fault and Active LED signals are located in the FC-SCA connector (J1) and through the indicator connector  
(J6). See Table 30 for the output characteristics of the LED drive signals.  
Table 30:  
LED drive signal  
State  
Current drive available  
0 < IOH < 100µA  
Output voltage  
LED off, high  
LED on, low  
IOL < -30 mA  
0 < VOL < 0.8V  
9.6.3  
FC Differential output  
The serial output signal voltage characteristics are provided in Table 31. The outputs are not AC coupled in  
order to deliver maximum signal without rise and fall time degradation. You must AC couple the receiver to iso-  
late potentially different DC characteristics of the outputs and the receiver.  
Table 31:  
FC Differential output characteristics  
Parameter  
Description  
Notes  
Serial output voltage swing  
600 < Vout < 1300 mV  
Centered at 1.32V  
Figure 22 provides the data output valid eye diagram relative to the bit cell time.  
Bit Time  
XMIT Eye  
Figure 22.  
9.6.4  
Transmit eye diagram  
FC Differential input  
The serial input signal voltage characteristics are provided in Table 32.  
Table 32:  
FC Differential input characteristics  
Description  
Parameter  
Notes  
Serial input voltage swing  
200 < Vin < 1.300 mV  
AC coupled  
72  
Cheetah 15K.4 FC Product Manual, Rev. B  
                 
Figure 23 provides the data valid eye diagram for typical and minimum requirements to recover data at the  
specified interface error rate. The inputs are AC coupled on the drive.  
941 ps  
659 ps  
376 ps  
Typical  
Minimum  
Figure 23.  
Table 33:  
Receive eye diagram  
Eye diagram data values  
Link rate  
1 GHz  
2 GHz  
4 GHz  
Bit time  
941 ps  
470 ps  
235 ps  
1
2
XMIT eye  
725 ps min.  
315 ps min.  
305 ps  
158 /113  
Typical  
659 ps  
395 ps  
145 ps  
113 ps  
RCV eye  
Minimum  
226 ps  
1.  
2.  
Short Ideal load.  
End of compliance channel.  
Cheetah 15K.4 FC Product Manual, Rev. B  
73  
     
74  
Cheetah 15K.4 FC Product Manual, Rev. B  
10.0  
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If you need help installing your drive, consult your system's documentation or contact the dealer's support ser-  
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Cheetah 15K.4 FC Product Manual, Rev. B  
75  
   
Customer Service Operations  
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Call center  
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Toll-free  
Direct dial  
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1
Hours of operation are 8:00 A.M. to 6:00 P.M., Monday through Friday (Central time).  
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Hours of operation are 8:00 A.M. to 5:00 P.M., Monday through Friday (Central time).  
Authorized Service Center  
2
3
4
5
Hours of operation are 8:00 A.M. to 8:00 P.M., Monday through Friday, and 9:00 A.M. to 5:00 P.M., Saturday (Eastern time).  
76  
Cheetah 15K.4 FC Product Manual, Rev. B  
European support services  
For presales and technical support in Europe, dial the Seagate Service Center toll-free number for your spe-  
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For European warranty service, dial the toll-free number for your specific location. If your location is not listed  
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Seagate Service Centers  
Toll-free support numbers  
Call center  
Austria  
Belgium  
Denmark  
France  
Germany  
Ireland  
Italy  
Presales and Technical Support  
Warranty Service  
00 800-47324289  
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Switzerland  
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For warranty service in Africa and the Middle East, dial our European CSO warranty center at +31-20-316-  
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3513. The CSO warranty center is located in Amsterdam, The Netherlands.  
Cheetah 15K.4 FC Product Manual, Rev. B  
77  
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For Asia/Pacific presales and technical support, dial the toll-free number for your specific location. The Asia/  
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1
Hours of operation are 8:30 A.M. to 5:30 P.M., Monday through Friday (Australian Western time).  
Hours of operation are 9:00 A.M. to 6:00 P.M., Monday through Saturday.  
Hours of operation are 9:30 A.M. to 6:30 P.M., Monday through Friday.  
Authorized Service Center  
2
3
4
78  
Cheetah 15K.4 FC Product Manual, Rev. B  
BGMS 42  
buffer  
Index  
data 8  
space 13  
busy status 63  
bypass circuit 19  
Byte check command 55  
bytes per surface 11  
bytes per track 11  
Numerics  
12 volt  
pins 67  
3rd party reserve command 57  
5 volt pins 67  
A
C
Abort Sequence (ABTS) 47  
abort task set function 48  
AC coupling 67  
cache operation 13  
cache segments 13  
Caching parameters page (08h) command 54  
caching write data 14  
Canadian Department of Communications 3  
capacity  
unformatted 11  
capacity, drive, programmable 9  
CC 50, 51  
AC power requirements 25  
ACA active status 63  
ACA active, faulted initiator status 63  
Accept (ACC) 47  
acoustics 37  
active LED Out signal 68  
Actual retry count bytes command 54  
actuator  
CF 49, 52  
Change definition command 56  
character sync 19  
assembly design 7  
adaptive caching 63  
Address Discovery (ADISC) 47  
addresses 64  
air cleanliness 37  
air flow 45  
illustrated 45  
Alternate credit model 49, 52  
altitude 35  
ambient 34  
ANSI documents  
fibre channel 5  
SCSI 5  
arbitrated loop physical address (AL_PA) 43  
arbitration 43  
asynchronous event notification 63  
audible noise 3  
auto negotiation of link rate 71  
auto write and read reallocation  
programmable 8  
automatic contingent allegiance 63  
average idle current 25, 26  
average rotational latency 11  
charge pins 67  
check condition status 63  
Class 3 parameters 49, 52  
class B limit 3  
Class valid 49, 52  
clear ACA function 48  
clear task set function 48  
commands supported 54  
Common features 49, 52  
Company ID 50, 51  
Compare command 56  
Concurrent sequences 49  
condensation 34  
condition met/good status 63  
connector  
illustrated 65  
requirements 65  
continuous vibration 37  
Continuously increasing offset 49, 52  
control code values 71  
Control mode page (0Ah) command 55  
cooling 45  
Copy and verify command 56  
Copy command 54  
B
CRC 19  
Background Media Scan 42  
backpanel 66  
error 18  
backplane 68  
Current profiles 27  
customer service 24  
basic link service frames 47  
Basic_Accept (BA_ACC) 47  
Basic_Reject (BA_RJT) 47  
BB 49, 52  
BB-Credit 49, 52  
Cheetah 15K.4 FC Product Manual, Rev. B  
79  
EMI requirements 3  
enable bypass  
D
data block size  
port A 68  
port B 68  
signal 68  
state 19  
modifing the 9  
data buffer to/from disc media 12  
data heads  
read/write 11  
Enclosure Services interface 66  
Enclosure services page command 55  
environmental  
limits 34  
requirements 17  
environmental control 37  
error  
data rate  
internal 11  
data transfer rate 12  
data valid eye 73  
Date code page command 54  
DC power 66  
requirements 25  
detection mechanisms, FC 19  
management 39  
rates 17  
defect and error management 39  
deferred error handling 63  
description 7  
DEV_CTRL_CODE 71  
Device Behavior page command 54  
device control code values 71  
Device Identification page command 54  
device selection IDs 43  
devices 43  
error correction code  
96-bit Reed-Solomon 8  
Error recovery page (01h) command 54  
extended link service  
frames 47  
reply frames 47  
Extended sense command 54  
Extent reservation command 57  
dimensions 38  
Disable page out command 55  
disc rotation speed 11  
Disconnect/reconnect control (page 02h) command  
F
fabric 52  
Fabric Address Notification (FAN) 47  
Fabric Login (FLOGI) 47  
FAN 52  
fault LED out signal 67  
FC differential input 72  
FC-AL  
Download microcode and save modes (5) 56  
Download microcode mode (4) 56  
Download microcode with offsets and save mode (7)  
Download microcode with offsets mode (6) 56  
drive 37  
interface 43, 66  
drive active LED connection 44  
drive capacity  
options supported 53  
physical interface 64  
SCA device connector, illustrated 65  
selective reset 63  
programmable 9  
drive characteristics 11  
drive fault LED connection 44  
drive ID 43  
drive ID/option select headers 43  
drive mounting 38, 46  
drive orientation 45  
FCC rules and regulations 3  
FCP  
response codes 48  
task management functions 48  
features 8  
drive select 66  
interface 47  
driver signals 72  
Fibre Channel documents 5  
Fibre Channel Interface Control page (19h) 55  
Fibre Channel Interface Manual 1, 3, 5  
Fibre Channel Services 47  
Field pointer bytes command 54  
firmware 8  
drivers and receivers 8  
dual port support 53  
E
electrical  
description of connector 66  
signal characteristics 71  
specifications 25  
corruption 57  
Firmware download option command 56  
Firmware numbers page command 54  
flawed sector reallocation 8  
FLOGI  
electromagnetic compatibility 3  
electromagnetic susceptibility 37  
80  
Cheetah 15K.4 FC Product Manual, Rev. B  
received on Port A 51  
received on Port B 51  
Force unit access command 55  
form factor 8  
intermediate/good status 63  
Intermix 49, 52  
internal data rate 11  
internal defects/errors 39  
internal drive characteristics 11  
format 43  
Format command execution time 12  
Format page (03h) command 54  
Format unit command 54  
front panel 38  
FS 49, 50, 52  
function  
J
J1 connector 43  
J6 connector 44, 45  
Jumper settings page command 54  
jumpers 43  
complete, code 00 48  
not supported, code 05 48  
reject, code 04 48  
L
latency  
average rotational 11, 12  
LBdata 56  
G
Good status 63  
gradient 34  
ground shift noise 67  
grounding 46  
LED driver signals 72  
Link Service Reject (LS_RJT) 47  
link services supported 47  
Lock-unlock-cache command 55  
Log select command 56  
Log sense command 56  
H
hard assigned arbitrated loop physical address logic power 67  
(AL_PA) 43 logical block address 13  
HDA 46  
heads  
read/write data 11  
logical block reallocation scheme 8  
logical block size 8, 12  
Logout (LOGO) 47  
loop 64, 68  
heat removal 45  
host equipment 46  
hot plugging the drive 19  
humidity 34  
disruption 19  
initialization 43  
loop position  
humidity limits 34  
FC-AL options 53  
loop position report  
FC-AL options 53  
LS_RJT 49, 52  
LSI circuitry 9  
I
ID and configuration options 8  
Implemented operating def. page command 54  
Information exceptions control page (1Ch) command  
M
maintenance 17  
Initiator control 49  
Inquiry command 54  
inquiry data 58  
installation 43  
maximum delayed motor start 25, 26  
maximum start current 25, 26  
mean time between failure (MTBF) 18  
media description 8  
guide 5  
Media Pre-Scan 42  
interface 43  
miscellaneous feature support  
Adaptive caching 63  
commands supported 54  
description 64  
error rate 17  
errors 18  
illustrated 64  
Asynchronous event notification 63  
Automatic contingent allegiance 63  
Deferred error handling 63  
FC-AL selective reset 63  
Parameter rounding 63  
physical 64  
requirements 47  
interleave 8  
intermediate/condition met/good status 63  
Queue tagging 63  
Reporting actual retry count 63  
Segmented caching 63  
Cheetah 15K.4 FC Product Manual, Rev. B  
81  
SMP = 1 in Mode Select command 63  
Synchronized (locked) spindle operation 63  
Zero latency read 63  
miscellaneous status support  
ACA active 63  
OPEN half duplex  
FC-AL options 53  
Open sequences per exchange 49  
operating 34, 35, 37  
option configurations 43  
option selection 66  
options 10, 53  
orientation 35  
out-of-plane distortion 46  
ACA active, faulted initiator 63  
Busy 63  
Check condition 63  
Condition met/good 63  
Good 63  
Intermediate/condition met/good 63  
Intermediate/good 63  
Reservation conflict 63  
Task set full 63  
P
P_LOGI  
received on Port A 50  
received on Port B 50  
package size 36  
package test specification 5  
packaged 36  
parameter rounding 63  
pass-through state 19  
PBC 64, 68  
PBdata 56  
PCBA 46  
peak bits per inch 11  
peak operating current 25, 26  
peak-to-peak measurements 27  
performance characteristics  
detailed 11  
miscorrected media data 17  
Mode select  
(10) command 57  
command 54  
Mode sense  
(10) command 57  
command 54  
data, table 58, 60  
monitoring state 19  
motor start  
controls 68  
option 12  
mounting 46  
holes 46  
orientations 45  
general 12  
mounting configuration 38  
mounting configuration dimensions 38  
MTBF 17, 18  
performance degradation 35  
performance highlights 9  
physical damage 37  
physical interface 64  
description 64  
physical specifications 25  
PI 50, 51  
pin descriptions 66  
PN 49, 52  
port bypass circuit 19, 64, 68  
port bypass LED connection 44  
Port DISCovery 49  
Port Discovery (PDISC) 47  
port identifier field 50, 51  
port login 49  
defined 18  
N
N_Port Login (PLOGI) 47  
payload 49  
payload values 50  
NN 49, 52  
Node Name 52  
Node name 49  
noise  
audible 3  
noise immunity 27  
non-operating 34, 35, 37  
temperature 34  
non-operating vibration 37  
accept 50  
Port Name 52  
Port name (initiator’s) 49  
power 67  
dissipation 31  
O
requirements, AC 25  
requirements, DC 25  
sequencing 27  
office environment 37  
old port state  
FC-AL options 53  
OPEN Full Duplex  
FC-AL options 53  
Power control page (1Ah) command 55  
power distribution 3  
power failure warning 71  
82  
Cheetah 15K.4 FC Product Manual, Rev. B  
Prefetch command 55  
prefetch/multi-segmented cache control 12  
Pre-Scan 42  
preventive maintenance 17  
private loop  
reliability 9  
specifications 17  
reliability and service 18  
repair and return information 24  
reporting actual retry count 63  
Request sense command 54  
reservation conflict status 63  
Reserve command 54  
Reserved (10) command 57  
resonance 35  
FC-AL options 53  
Proc Assc 49  
Process Accept (ACC) 51  
Process Login (PRLI) 47, 50  
Process Login Accept (ACC) payload 51  
process login payload data 50  
Process Logout (PRLO) 47  
programmable drive capacity 9  
public loop  
return information 24  
Rezero unit command 54  
Rigid disc drive geometry page  
command 54  
FC-AL options 53  
rotation speed 11  
pull down resistor 68  
running disparity 19  
Q
S
queue tagging 63  
safety 3  
SCA part numbers 65  
SCSI interface  
commands supported 54  
Search data  
equal command 55  
high command 55  
low command 55  
Seek command 54  
seek error  
defined 18  
rate 17  
Seek extended command 55  
seek performance characteristics 11  
seek time  
R
radio interference regulations 3  
Random relative offset 49, 52  
RCD bit 13  
Read buffer command 56  
Read capacity command 55  
Read combined header and data mode (0) 56  
Read command 54  
Read data mode (2) 56  
Read defect data command 56  
Read descriptor mode (3) 56  
read error rates 17  
Read extended command 55  
Read Link Status (RLS) 47  
Read long command 56  
read/write data heads 11  
Reassign blocks command 54  
Receive buffer field size 49, 52  
receive buffer field size 50  
Receive diagnostic results command 55  
receive eye  
diagram 73  
receivers 67  
recommended mounting 36  
Recoverable Errors 17  
recovered media data 17  
reference  
average typical 11  
full stroke typical 11  
single track typical 11  
segmented caching 63  
SEL ID 43  
lines 69  
standard feature 8  
Self-Monitoring Analysis and Reporting Technology  
Send diagnostics page command 55  
Sequential delivery 49, 52  
Service Options 52  
Service options 49  
Set limits command 55  
shielding 3  
shipping 23  
shipping container 34  
shock 35  
and vibration 35  
shock mount 46  
documents 5  
Regenerate command 57  
Register FC-4 Types (RFT_ID) 47  
Relative address command 55  
relative humidity 34  
Release command 54  
Released (10) command 57  
signal  
characteristics 71  
Cheetah 15K.4 FC Product Manual, Rev. B  
83  
LED driver 72  
unique identifier 50, 51  
single-unit shipping pack kit 10  
SMART 9, 19  
Unit attention page (00h) command 54  
Unit serial number page command 54  
Unrecoverable Errors 17  
SMP = 1 in Mode Select command 63  
SO 49, 52  
unrecovered media data 17  
spindle brake 8  
Stacked connection req. 49, 52  
standards 3  
Start unit/stop unit command 55  
start/stop time 12  
support services 75  
Supported diagnostics pages command 55  
surface stiffness  
V
Valid version level 49, 52  
Verify command 55  
Verify error recovery page (07h) command 54  
vibration 35, 37  
Vital product data page command 54  
allowable for non-flat surface 46  
switches 43  
W
Synchronize cache command 55  
synchronized spindle  
warranty 23  
word sync 19  
operation 63  
system chassis 46  
Write and verify command 55  
Write buffer command 56  
Write combined header and data mode (0) 56  
Write command 54  
Write data mode (2) 56  
Write extended command 55  
Write long command 56  
Write same command 56  
T
target reset function 48  
task management functions 48  
Abort task set 48  
Clear ACA 48  
Clear task set 48  
Target reset 48  
X
terminate task 48  
XD read 57  
task management response codes 48  
Function complete 00 48  
Function not supported 05 48  
Function reject 04 48  
task set full status 63  
technical support services 75  
temperature 34, 45  
limits 34  
XD write 56  
XD write extended command 57  
XID reassign 49  
XP write 57  
Z
zero latency read 63  
zone bit recording (ZBR) 8  
non-operating 34  
regulation 3  
See also cooling  
terminate task function 48  
terminators 43  
Test unit ready command 54  
Third-party Process Logout (TRPLO) 47  
tracks per inch 11  
tracks per surface 11  
Translate page command 55  
transmit eye diagram 72  
transmitters 67  
transporting the drive 23  
TTL input characteristics 71  
U
UI 50, 51  
unformatted 9  
84  
Cheetah 15K.4 FC Product Manual, Rev. B  
Seagate Technology LLC  
920 Disc Drive, Scotts Valley, California 95066-4544, USA  
Publication Number: 100366896, Rev. B, Printed in USA  

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