Seagate CHEETAH 15K7 SAS ST3450757SS User Manual

Product Manual  
Cheetah 15K.7 SAS  
Standard models  
ST3600057SS  
ST3450857SS  
ST3300657SS  
Self-Encrypting Drive models  
ST3600957SS  
ST3450757SS  
ST3300557SS  
100516226  
Rev. A  
May 2009  
Contents  
6.4.1  
Cheetah 15K.7 SAS Product Manual, Rev. A  
i
ii  
Cheetah 15K.7 SAS Product Manual, Rev. A  
iv  
Cheetah 15K.7 SAS Product Manual, Rev. A  
1.0  
Scope  
This manual describes Seagate Technology® LLC, Cheetah® SAS (Serial Attached SCSI) disk drives.  
Cheetah 15K.7 drives support the SAS Protocol specifications to the extent described in this manual. The SAS  
Interface Manual (part number 100293071) describes the general SAS characteristics of Cheetah 15K.7 and  
other Seagate SAS drives. The Self-Encrypting Drive (SED) Users Guide, part number 100515636 describes  
the interface, general operation and security features available on SED drives.  
Note. Previous generations of Seagate Self-Encrypting Drive models were called Full Disk Encryption  
(FDE) models before a differentiation between drive-based encryption and other forms of encryp-  
tion was necessary.  
Model Number  
ST3600057SS  
ST3450857SS  
ST3300657SS  
ST3600957SS  
ST3450757SS  
ST3300557SS  
Capacity  
600 GB  
450 GB  
300 GB  
600 GB  
450 GB  
300 GB  
Self-Encrypting Drive (SED)  
No  
No  
No  
Yes  
Yes  
Yes  
Cheetah 15K.7 SAS Product Manual, Rev. A  
1
   
2.0  
Standards, compliance and reference documents  
The drive has been developed as a system peripheral to the highest standards of design and construction. The  
drive depends on its host equipment to provide adequate power and environment for optimum 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 regulation. In particular,  
the drive must be securely mounted to guarantee the specified performance characteristics. Mounting by bot-  
tom holes must meet the requirements of Section 9.3.  
2.1  
Standards  
The Cheetah 15K.7 SAS family complies with Seagate standards as noted in the appropriate sections of this  
manual and the Seagate SAS Interface Manual, part number 100293071.  
The drives are recognized in accordance with UL 60950-1 and CSA 60950-1 as tested by UL and EN60950-1  
as tested by TUV.  
The security features of Cheetah 15K.7 SAS SED models are based on the “TCG Storage Architecture Core  
Specification” and the “TCG Storage Workgroup Security Subsystem Class: Enterprise_A” specification with  
additional vendor-unique features as noted in this product manual.  
2.1.1  
Electromagnetic compatibility  
The drive, as delivered, is designed for system integration and installation into a suitable enclosure prior to  
use. 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 Communications.  
The design characteristics of the drive serve to minimize radiation when installed in an enclosure that provides  
reasonable shielding. The drive is capable of meeting the Class B limits of the FCC Rules and Regulations 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 controller.  
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 Tables 13, 14 and 15, for DC power requirements.  
2
Cheetah 15K.7 SAS Product Manual, Rev. A  
                                 
2.2  
Compliance  
2.2.1  
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  
• Keyboard  
• Monitor/display  
• Printer  
• 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 KCC  
If this model has the Korean Communications Commission (KCC) logo, it complies with paragraph 1 of Article  
11 of the Electromagnetic Compatibility (EMC) Control Regulation and meets the Electromagnetic Compatibil-  
ity Framework requirements of the Radio Research Laboratory (RRL) Ministry of Information and Communica-  
tion Republic of Korea  
Taiwanese BSMI  
If this model has two Chinese words meaning “EMC certification” followed by an eight digit identification num-  
ber, as a Marking, it complies with Chinese National Standard (CNS) 13438 and meets the Electromagnetic  
Compatibility (EMC) Framework requirements of the Taiwanese Bureau of Standards, Metrology, and Inspec-  
tion (BSMI).  
2.3  
European Union Restriction of Hazardous Substances (RoHS)  
The European Union Restriction of Hazardous Substances (RoHS) Directive restricts the presence of chemical  
substances, including Lead (Pb), in electronic products effective July 2006.  
A number of parts and materials in Seagate products are procured from external suppliers. We rely on the rep-  
resentations of our suppliers regarding the presence of RoHS substances in these parts and materials. Our  
supplier contracts require compliance with our chemical substance restrictions, and our suppliers document  
their compliance with our requirements by providing material content declarations for all parts and materials for  
the disk drives documented in this publication. Current supplier declarations include disclosure of the inclusion  
of any RoHS-regulated substance in such parts or materials.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
3
     
Seagate also has internal systems in place to ensure ongoing compliance with the RoHS Directive and all laws  
and regulations which restrict chemical content in electronic products. These systems include standard operat-  
ing procedures that ensure that restricted substances are not utilized in our manufacturing operations, labora-  
tory analytical validation testing, and an internal auditing process to ensure that all standard operating  
procedures are complied with.  
2.4  
Reference documents  
SCSI Commands Reference Manual  
SAS Interface Manual  
Seagate part number: 100293068  
Seagate part number: 100293071  
ANSI SAS documents  
SFF-8323  
3.5” Drive Form Factor with Serial Connector  
HSS Backplane Design Guidelines  
Multi Lane Copper Connector  
SFF-8460  
SFF-8470  
SFF-8482  
SAS Plug Connector  
ANSI INCITS.xxx  
Serial Attached SCSI (SAS-2) Standard (T10/1562-D)  
ISO/IEC 14776-xxx SCSI Architecure Model-4 (SAM-4) Standard (T10/1561-D)  
ISO/IEC 14776-xxx SCSI Primary Commands-3 (SPC-3) Standard (T10/1416-D)  
ISO/IEC 14776-xxx SCSI Block Commands-2 (SBC-2) Standard (T10/1417-D)  
Trusted Computing Group (TCG) Documents (apply to SED models only)  
TCG Core Specification, version 0.9  
TCG SSC Specification (draft)  
Self-Encrypting Drives Users Guide‘  
Specification for Acoustic Test Requirement and Procedures  
Package Test Specification  
Seagate part number: 100515636  
Seagate part number: 30553-001  
Seagate P/N 30190-001 (under 100 lb.)  
Seagate P/N 30191-001 (over 100 lb.)  
Package Test Specification  
In case of conflict between this document and any referenced document, this document takes precedence.  
4
Cheetah 15K.7 SAS Product Manual, Rev. A  
         
3.0  
General description  
Cheetah 15K.7 drives provide high performance, high capacity data storage for a variety of systems including  
engineering workstations, network servers, mainframes, and supercomputers. The Serial Attached SCSI inter-  
face is designed to meet next-generation computing demands for performance, scalability, flexibility and high-  
density storage requirements.  
Cheetah 15K.7 drives support the Serial Attached SCSI Protocol as described in the ANSI specifications, this  
document, and the SAS Interface Manual (part number 100293071) which describes the general interface  
characteristics of this drive. Cheetah 15K.7 drives are classified as intelligent peripherals and provide level 2  
conformance (highest level) with the ANSI SCSI-1 standard. The SAS connectors, cables and electrical inter-  
face are compatible with Serial ATA (SATA), giving future users the choice of populating their systems with  
either SAS or SATA hard disk drives. This allows you to continue to leverage your existing investment in SCSI  
while gaining a 3Gb/s serial data transfer rate.  
Cheetah 15K.7 SAS SED models have provisions for “Security of Data at Rest” based on the standards  
defined by the Trusted Computing Group (see www.trustedcomputinggroup.org).  
Note. Never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads,  
media, actuator, 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.7 drives use a dedicated landing zone at the innermost radius of the media to eliminate the pos-  
sibility of destroying or degrading data by landing in the data zone. The heads automatically go to the landing  
zone when power is removed from the drive.  
An automatic shipping lock prevents potential damage to the heads and disks 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.7 SAS Product Manual, Rev. A  
5
     
3.1  
Standard features  
Cheetah 15K.7 drives have the following standard features:  
• 1.5 / 3 / 6 Gbit Serial Attached SCSI (SAS) interface  
• Integrated dual port SAS controller supporting the SCSI protocol  
• Support for SAS expanders and fanout adapters  
• Firmware downloadable using the SAS interface  
• 128 - deep task set (queue)  
• Supports up to 32 initiators  
• Jumperless configuration.  
• User-selectable logical block size (512, 520, or 528 bytes per logical block)  
• Programmable logical block reallocation scheme  
• Flawed logical block reallocation at format time  
• Programmable auto write and read reallocation  
• Reallocation of defects on command (Post Format)  
• ECC maximum burst correction length of 320 bits  
• No preventive maintenance or adjustments required  
• Dedicated head landing zone  
• Embedded servo design  
• Automatic shipping lock  
• Self diagnostics performed when power is applied to the drive  
• Zone bit recording  
• Vertical, horizontal, or top down mounting  
• Dynamic spindle brake  
• 16 Mbyte data buffer  
• Drive Self Test  
• Background Media Scan  
• Power Save  
Cheetah 15K.7 SAS SED models have the following additional features:  
• Automatic data encryption/decryption on all writes and reads to and from the media  
• Controlled access  
• Random number generator  
• Drive locking  
• Two independent data bands which each have it’s own ownership credential and encryption key  
• Cryptographic erase of user data for a drive that will be repurposed or scrapped  
• Authenticated firmware download  
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.  
3.3  
Performance  
• Programable multi-segmented cache buffer  
• 600 Mbytes/sec maximum instantaneous data transfers  
• 15k RPM spindle. Average latency = 2.0 msec  
• Background processing of queue  
• Supports start and stop commands (spindle stops spinning)  
• Adaptive seek velocity; improved seek performance  
6
Cheetah 15K.7 SAS Product Manual, Rev. A  
                           
Note. There is no significant performance difference between Self-Encrypting Drive and standard (non-  
Self-Encrypting Drive models.  
3.4  
Reliability  
• 1,600,000 hour MTBF (Annualized Failure Rate (AFR) of 0.55%)  
• Incorporates industry-standard Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)  
• 5-year warranty  
3.5  
Formatted capacities  
Standard OEM models are formatted to 512 bytes per block. The block size is selectable at format time and  
must be one of the supported sizes listed in the table below.  
Seagate designs specify capacity points at certain block 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:  
ST3600057SS  
ST3600957SS  
ST3450857SS  
ST3450757SS  
ST3300657FC  
ST3300557FC  
Sector Size  
512  
Decimal  
Hex  
Decimal  
Hex  
Decimal  
Hex  
1,172,123,568  
1,147,307,694  
1,132,015,600  
1,115,749,560  
45DD2FB0  
446286AE  
43792FF0  
4280FCB8  
879,097,968  
860,480,771  
849,011,700  
836,812,167  
3465F870  
3349E503  
329AE3F4  
31E0BD87  
585,937,500  
573,653,848  
566,007,800  
557,874,778  
22ECB25C  
22314358  
21BC97F8  
21407E5A  
520  
524  
528  
3.6  
Programmable drive capacity  
Using the Mode Select command, the drive can change its capacity to something less than maximum. See the  
Mode Select (6) parameter list table in the SAS Interface Manual, part number 100293071. A value of zero in  
the Number of Blocks field indicates that the drive will not change the capacity it is currently formatted to have.  
A number other than zero and less than the maximum number of LBAs in the Number of Blocks field changes  
the total drive capacity to the value in the Number of Blocks field. A value greater than the maximum number of  
LBAs is rounded down to the maximum capacity.  
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 Safety and Regulatory Agency Specifications, part number 75789512, may be included with each stan-  
dard OEM drive shipped.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
7
                 
4.0  
Performance characteristics  
This section provides detailed information concerning performance-related characteristics and features of  
Cheetah 15K.7 drives.  
4.1  
Internal drive characteristics  
ST3600057SS ST3450857SS ST3300657SS  
ST3600957SS ST3450757SS ST3300557SS  
*
Drive capacity  
600  
450  
300  
Gbytes (formatted, rounded off value)  
Read/write data heads  
Tracks per inch  
8
6
4
165,000  
1,361  
225  
165,000  
1,361  
225  
165,000  
1,361  
225  
TPI  
Peak bits per inch  
Areal Density  
KBPI  
2
Gbits/inch  
Internal data rate  
Disk rotation speed  
Avg rotational latency  
1.49 - 2.37  
15k  
1.49 - 2.37  
15k  
1.49 - 2.37  
15k  
Gbits/sec (max)  
RPM  
2.0  
2.0  
2.0  
msec  
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment  
and formatting.  
4.2  
Seek time  
See Section 10.4.1, "SAS physical interface" on page 56 and the SAS Interface Manual (part number  
100293071) for additional timing details.  
4.2.1  
Access time  
1 2  
,
Not Including controller overhead  
(msec)  
Read  
3.4  
Write  
3.9  
Average  
Typical  
Typical  
Typical  
Single track  
Full stroke  
0.2  
0.44  
7.4  
6.6  
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.  
8
Cheetah 15K.7 SAS Product Manual, Rev. A  
                                             
4.2.2  
Format command execution time (minutes)  
When changing sector sizes, the format times shown below may need to be increased by 30 minutes.  
ST3600057SS  
ST3450857SS  
ST3300657SS  
Maximum (with verify)  
119  
60  
90  
45  
58  
29  
Maximum (without verify)  
Note. There is no significant difference in the format time between SED and non-SED models of the  
same capacity.  
Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request  
for a Status Byte Transfer to the Initiator (excluding connect/disconnect).  
4.2.3  
General performance characteristics  
Sustainable disk transfer rate*:  
Minimum  
122 Mbytes/sec (typical)  
204 Mbytes/sec (typical)  
Maximum  
SAS Interface maximum instantaneous transfer rate  
Logical block sizes  
600 Mbytes/sec* per port  
Default is 512-byte data blocks  
Sector sizes variable to 512, 520, and 528 kbytes.  
Read/write consecutive sectors on a track  
Yes  
Flaw reallocation performance impact (for flaws reallocated at format time using  
the spare sectors per sparing zone reallocation scheme.)  
Negligible  
Average rotational latency  
2.0 msec  
*Assumes system ability to support the rates listed and no cable loss.  
1 MB/sec = 1,000,000 bytes/sec  
4.3  
Start/stop time  
The drive accepts the commands listed in the SAS Interface Manual less than 3 seconds after DC power has  
been applied.  
If the drive receives a NOTIFY (ENABLE SPINUP) primitive through either port and has not received a START  
STOP UNIT command with the START bit equal to 0, the drive becomes ready for normal operations within 20  
seconds (excluding the error recovery procedure).  
If the drive receives a START STOP UNIT command with the START bit equal to 0 before receiving a NOTIFY  
(ENABLE SPINUP) primitive, the drive waits for a START STOP UNIT command with the START bit equal to 1.  
After receiving a START STOP UNIT command with the START bit equal to 1, the drive waits for a NOTIFY  
(ENABLE SPINUP) primitive. After receiving a NOTIFY (ENABLE SPINUP) primitive through either port, the  
drive becomes ready for normal operations within 20 seconds (excluding the error recovery procedure).  
Cheetah 15K.7 SAS Product Manual, Rev. A  
9
                 
If the drive receives a START STOP UNIT command with the START bit and IMMED bit equal to 1 and does  
not receive a NOTIFY (ENABLE SPINUP) primitive within 5 seconds, the drive fails the START STOP UNIT  
command.  
The START STOP UNIT command may be used to command the drive to stop the spindle. Stop time is 30 sec-  
onds (maximum) from removal of DC power. 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  
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 Section 10.3.2.1.  
4.5  
Cache operation  
Note. Refer to the SAS Interface Manual for more detail concerning the cache bits.  
Of the 16 Mbytes physical buffer space in the drive, approximately 13,000 kbytes can be used as a cache. The  
buffer is divided into logical segments from which data is read and to which data is written.  
The drive keeps track of the logical block addresses of the data stored in each segment of the buffer. If the  
cache is enabled (see RCD bit in the SAS Interface Manual), data requested by the host with a read command  
is retrieved from the buffer, if possible, before any disk access is initiated. If cache operation is not enabled, the  
buffer is still used, but only as circular buffer segments during disk medium read operations (disregarding  
Prefetch operation for the moment). That is, the drive does not check in the buffer segments for the requested  
read data, but goes directly to the medium to retrieve it. The retrieved data merely passes through some buffer  
segment on the way to the host. All data transfers to the host are in accordance with buffer-full ratio rules. See  
the explanation provided with the information about Mode Page 02h (disconnect/reconnect control) in the SAS  
Interface Manual.  
The following is a simplified description of the prefetch/cache operation:  
Case A—read command is received and all of the requested logical blocks are already in the cache:  
1. Drive transfers the requested logical blocks to the initiator.  
Case B—A Read command requests data, and at least one requested logical block is not in any segment of  
the cache:  
1. The drive fetches the requested logical blocks from the disk 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.  
Each cache segment is actually a self-contained circular buffer whose length is an integer number of logical  
blocks. The drive dynamically creates and removes segments based on the workload. The wrap-around capa-  
bility of the individual segments greatly enhances the cache’s overall performance.  
Note. The size of each segment is not reported by Mode Sense command page 08h, bytes 14 and 15.  
The value 0XFFFF is always reported regardless of the actual size of the segment. Sending a size  
specification using the Mode Select command (bytes 14 and 15) does not set up a new segment  
size. If the STRICT bit in Mode page 00h (byte 2, bit 1) is set to one, the drive responds as it does  
for any attempt to change an unchangeable parameter.  
10  
Cheetah 15K.7 SAS Product Manual, Rev. A  
                 
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 10.3.2.1 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 disk immediately beyond that which  
was requested by a Read command are retrieved and stored in the buffer for immediate transfer from the buf-  
fer to the host on subsequent Read commands that request those logical blocks (this is true even if cache  
operation is disabled). Though the prefetch operation uses the buffer as a cache, finding the requested data in  
the buffer is a prefetch hit, not a cache operation hit.  
To enable Prefetch, use Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0  
enables prefetch.  
The drive does not use the Max Prefetch field (bytes 8 and 9) or the Prefetch Ceiling field (bytes 10 and 11).  
When prefetch (read look-ahead) is enabled (enabled by DRA = 0), the drive enables prefetch of contiguous  
blocks from the disk when it senses that a prefetch hit will likely occur. The drive disables prefetch when it  
decides that a prefetch hit is not likely to occur.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
11  
     
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.  
Seek error rate:  
Less than 10 errors in 108 seeks  
Read Error Rates  
Recovered Data  
Less than 10 errors in 1012 bits transferred (OEM default settings)  
Less than 1 sector in 1016 bits transferred  
Less than 1 sector in 1021 bits transferred  
Less than 1 error in 1012 bits transferred  
1,600,000 hours  
Unrecovered Data  
Miscorrected Data  
Interface error rate:  
MTBF  
AFR  
0.55%  
Preventive maintenance:  
None required  
5.1  
Error rates  
The error rates stated in this manual assume the following:  
• The drive is operated per this specification using DC power as defined in this manual (see Section 6.2).  
• Errors caused by host system failures are excluded from error rate computations.  
• Assume random data.  
• Default OEM error recovery settings are applied. This includes AWRE, ARRE, full read retries, full write  
retries and full retry time.  
• Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated  
5.1.1  
Recoverable Errors  
Recoverable errors are those detected and corrected by the drive, and do not require user intervention.  
Recoverable Data errors use retries and correction. Application of ECC on-the-fly correction alone is not con-  
sidered a Recovered Data error.  
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  
Unrecoverable Data Errors (Sense Key = 03h) are specified at less than 1 sector in error per 1016 bits trans-  
ferred. Unrecoverable Data Errors resulting from the same cause are treated as 1 error for that block.  
12  
Cheetah 15K.7 SAS Product Manual, Rev. A  
                                 
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.  
5.2  
Reliability and service  
You can enhance the reliability of Cheetah disk drives by ensuring that the drive receives adequate cooling.  
Section 6.0 provides temperature measurements and other information that may be used to enhance the ser-  
vice life of the drive. Section 9.2 provides recommended air-flow information.  
5.2.1  
Annualized Failrue Rate (AFR) and Mean time between failure (MTBF)  
These drives shall achieve an AFR of 0.55% (MTBF of 1,600,000 hours) when operated in an environment that  
ensures the HDA case temperatures do not exceed the values specified in Section 6.4.  
Operation at case temperatures outside the specifications in Section 6.4 may increase the AFR (decrease the  
MTBF). AFR and MTBF statistics are population statistics that are not relevant to individual units.  
AFR and MTBF specifications are based on the following assumptions for Enterprise Storage System environ-  
ments:  
• 8,760 power-on hours per year.  
• 250 average on/off cycles per year.  
• Operations at nominal voltages.  
• Systems will provide adequate cooling to ensure the case temperatures specified in Section 6.4.1 are not  
exceeded.  
5.2.2  
Preventive maintenance  
No routine scheduled preventive maintenance is required.  
5.2.3  
Hot plugging the drive  
When a disk is powered on by switching the power or hot plugged, the drive runs a self test before attempting  
to communicate on its’ interfaces. When the self test completes successfully, the drive initiates a Link Reset  
starting with OOB. An attached device should respond to the link reset. If the link reset attempt fails, or any  
time the drive looses sync, the drive initiated link reset. The drive will initiate link reset once per second but  
alternates between port A and B. Therefore each port will attempt a link reset once per 2 seconds assuming  
both ports are out of sync..  
If the self-test fails, the does not respond to link reset on the failing port.  
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.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
13  
                     
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 two hours.  
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.  
Performance impact  
S.M.A.R.T. attribute data is saved to the disk 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 drive  
interfaces. The process of measuring off-line attribute data and saving data to the disk is uninterruptable. The  
maximum 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  
14  
Cheetah 15K.7 SAS Product Manual, Rev. A  
   
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.7 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.  
The thermal monitor system generates a warning code of 01-0B01 when the temperature exceeds the speci-  
fied limit in compliance with the SCSI standard. The drive temperature is reported in the FRU code field of  
mode sense data. You can use this information to determine if the warning is due to the temperature exceeding  
the drive threatening temperature or the user-specified temperature.  
This feature is controlled by the Enable Warning (EWasc) bit, and the reporting mechanism is controlled by the  
Method of Reporting Informational Exceptions field (MRIE) on the Informational Exceptions Control (IEC)  
mode page (1Ch).  
The current algorithm implements two temperature trip points. The first trip point is set at 68°C which is the  
maximum temperature limit according to the drive specification. The second trip point is user-selectable using  
the Log Select command. The reference temperature parameter in the temperature log page (see Table 12)  
Cheetah 15K.7 SAS Product Manual, Rev. A  
15  
 
can be used to set this trip point. The default value for this drive is 68°C, however, you can set it to any value in  
the range of 0 to 68°C. If you specify a temperature greater than 68°C in this field, the temperature is rounded  
down to 68°C. A sense code is sent to the host to indicate the rounding of the parameter field.  
Table 12:  
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.  
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:  
16  
Cheetah 15K.7 SAS Product Manual, Rev. A  
   
• Motor will not spin  
• Motor will not lock to speed  
• Servo will not lock on track  
• Drive cannot read configuration tables from the disk  
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.  
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.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
17  
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. Sea-  
gate 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.  
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.  
18  
Cheetah 15K.7 SAS Product Manual, Rev. A  
             
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 shown below. Values indicated apply at the drive  
connector.  
The standard drive models and the SED drive models have identical hardware, however the security and  
encryption portion of the drive controller ASIC is enabled and functional in the SED models. This represents a  
small additional drain on the 5V supply of about 30mA and a commensurate increase of about 150mW in  
power consumption. There is no additional drain on the 12V supply.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
19  
                 
Table 13:  
600 GB DC power requirements  
ST3600057SS  
ST3600957SS  
3 Gbit mode  
ST3600057SS  
ST3600957SS  
6 Gbit mode  
Notes (Amps)  
(Amps)  
(Amps)  
+5V  
(Amps)  
Voltage  
+5V  
±5%  
0.37  
+12V [2]  
±5% [2]  
0.81  
+12V [2]  
±5% [2]  
0.81  
Regulation  
[5]  
±5%  
Avg idle current  
[1] [7]  
0.38  
Maximum starting current  
(peak DC) DC  
3σ  
3σ  
3σ  
[3]  
0.67  
0.98  
0.55  
1.90  
3.82  
0.04  
0.68  
0.98  
0.56  
1.91  
3.88  
0.04  
(peak AC) AC  
[3]  
Delayed motor start (max) DC  
Peak operating current (random read):  
Typical DC  
[1] [4]  
[1][6] [1]  
0.44  
0.49  
1.32  
1.15  
1.20  
3.00  
0.45  
0.51  
1.34  
1.17  
1.21  
3.00  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
Peak operating current (random write):  
Typical DC  
3σ  
[1][6] [1]  
0.51  
0.56  
1.26  
1.03  
1.05  
2.94  
0.53  
0.58  
1.28  
1.04  
1.07  
2.92  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
Peak operating current (sequential read):  
Typical DC  
3σ  
[1][6] [1]  
0.98  
1.08  
1.40  
0.83  
0.84  
1.26  
0.99  
1.10  
1.46  
0.84  
0.85  
1.24  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
Peak operating current (sequential write):  
Typical DC  
3σ  
[1][6] [1]  
0.93  
1.00  
1.30  
0.83  
0.84  
1.24  
0.94  
1.02  
1.30  
0.83  
0.85  
1.26  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
3σ  
20  
Cheetah 15K.7 SAS Product Manual, Rev. A  
       
Table 14:  
450 GB DC power requirements  
ST3450857SS  
ST3450757SS  
3 Gbit mode  
ST3450857SS  
ST3450757SS  
6 Gbit mode  
Notes (Amps)  
(Amps)  
(Amps)  
+5V  
(Amps)  
Voltage  
+5V  
±5%  
0.39  
+12V [2]  
±5% [2]  
0.68  
+12V [2]  
±5% [2]  
0.66  
Regulation  
[5]  
±5%  
Avg idle current  
[1] [7]  
0.41  
Maximum starting current  
(peak DC) DC  
3σ  
3σ  
3σ  
[3]  
0.65  
0.94  
0.54  
1.94  
3.91  
0.04  
0.67  
0.96  
0.56  
1.94  
3.89  
0.04  
(peak AC) AC  
[3]  
Delayed motor start (max) DC  
Peak operating current (random read):  
Typical DC  
[1] [4]  
[1][6] [1]  
0.45  
0.48  
1.28  
1.01  
1.08  
2.90  
0.47  
0.51  
1.30  
1.02  
1.06  
2.84  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
Peak operating current (random write):  
Typical DC  
3σ  
[1][6] [1]  
0.52  
0.56  
1.24  
0.90  
0.93  
2.78  
0.55  
0.58  
1.26  
0.89  
0.91  
2.84  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
Peak operating current (sequential read):  
Typical DC  
3σ  
[1][6] [1]  
0.98  
1.04  
1.36  
0.69  
0.70  
1.10  
1.03  
1.10  
1.44  
0.67  
0.68  
1.10  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
Peak operating current (sequential write):  
Typical DC  
3σ  
[1][6] [1]  
0.95  
0.99  
1.26  
0.69  
0.70  
1.10  
0.98  
1.02  
1.30  
0.67  
0.68  
1.12  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
3σ  
Cheetah 15K.7 SAS Product Manual, Rev. A  
21  
         
Table 15:  
300 GB DC power requirements  
ST3300657SS  
ST3300557SS  
3 Gbit mode  
ST3300657SS  
ST3300557SS  
6 Gbit mode  
Notes (Amps)  
(Amps)  
(Amps)  
+5V  
(Amps)  
Voltage  
+5V  
±5%  
0.34  
+12V [2]  
±5% [2]  
0.58  
+12V [2]  
±5% [2]  
0.58  
Regulation  
[5]  
±5%  
Avg idle current  
[1] [7]  
0.35  
Maximum starting current  
(peak DC) DC  
3σ  
3σ  
3σ  
[3]  
0.53  
0.98  
0.47  
1.92  
3.82  
0.04  
0.54  
0.86  
0.48  
1.92  
3.98  
0.04  
(peak AC) AC  
[3]  
Delayed motor start (max) DC  
Peak operating current (random read):  
Typical DC  
[1] [4]  
[1][6] [1]  
0.41  
0.42  
1.18  
0.88  
0.95  
2.78  
0.42  
0.43  
1.20  
0.90  
0.95  
2.74  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
Peak operating current (random write):  
Typical DC  
3σ  
[1][6] [1]  
0.48  
0.49  
1.18  
0.80  
0.83  
2.68  
0.49  
0.51  
1.20  
0.81  
0.82  
2.66  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
Peak operating current (sequential read):  
Typical DC  
3σ  
[1][6] [1]  
0.91  
0.93  
1.20  
0.59  
0.60  
0.98  
0.92  
0.94  
1.24  
0.59  
0.61  
1.00  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
Peak operating current (sequential write):  
Typical DC  
3σ  
[1][6] [1]  
0.89  
0.93  
1.22  
0.58  
0.60  
0.98  
0.90  
0.94  
1.22  
0.59  
0.60  
0.96  
Maximum DC  
3σ  
[1]  
Maximum DC (peak)  
3σ  
[1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous +12V current  
peaks will exceed these values. 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  
15,000 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 1.  
[4] This condition occurs after OOB and Speed Negotiation completes but before the drive has received the  
Notify Spinup primitive.  
22  
Cheetah 15K.7 SAS Product Manual, Rev. A  
         
[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 375 I/Os per second for 600GB models, and  
380 I/Os per second for 450GB and 300GB models. Current and power specified at nominal voltages.  
[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 1.7% 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.  
+5V  
=
250 mV pp from 0 to 100 kHz to 20 MHz.  
+12V = 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 are shown below in the following figures.  
Note: All times and currents are typical. See Tables 13, 14, and 15 for maximum current requirements.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
23  
             
Figure 1.  
Typical 600GB current profiles  
Figure 2.  
Typical 450GB current profiles  
24  
Cheetah 15K.7 SAS Product Manual, Rev. A  
 
Figure 3.  
Typical 300GB current profiles  
Cheetah 15K.7 SAS Product Manual, Rev. A  
25  
6.3  
Power dissipation  
ST3600057SS model  
Typical power dissipation under idle conditions in 6Gb operation is 11.62 watts (39.65 BTUs per hour).  
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure  
4). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5  
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by  
3.4123.  
Figure 4.  
ST3600057SS DC current and power vs. input/output operations per second  
26  
Cheetah 15K.7 SAS Product Manual, Rev. A  
     
ST3450857SS model  
Typical power dissipation under idle conditions in 6Gb operation is 9.97 watts (34.02 BTUs per hour).  
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure  
4). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5  
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by  
3.4123.  
Figure 5.  
ST3450857SS DC current and power vs. input/output operations per second  
Cheetah 15K.7 SAS Product Manual, Rev. A  
27  
ST3300657SS model  
Typical power dissipation under idle conditions in 6Gb operation is 8.71 watts (29.72 BTUs per hour).  
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure  
4). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5  
volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by  
3.4123.  
Figure 6.  
ST3300657SS DC current and power vs. input/output operations per second  
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  
a. Operating  
The maximum allowable continuous or sustained HDA case temperature for the rated Annualized Failure  
Temperature  
Rate (AFR) is 122°F (50°C) The maximum allowable HDA case temperature is 60°C. Occasional excur-  
sions of HDA case temperatures above 122°F (50°C) or below 41°F (5°C) may occur without impact to the  
specified AFR. Continual or sustained operation at HDA case temperatures outside these limits may  
degrade AFR.  
Provided the HDA case temperatures limits are met, the drive meets all specifications over a 41°F to 131°F  
(5°C to 55°C) drive ambient temperature range with a maximum temperature gradient of 86°F (30°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.  
28  
Cheetah 15K.7 SAS Product Manual, Rev. A  
           
b. Non-operating  
–40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 86°F (30°C) per hour. This  
specification assumes that the drive is packaged in the shipping container designed by Seagate for use with  
drive.  
HDA Temp.  
1.0"  
Check Point  
.5"  
Figure 7.  
Location 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.  
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 8, and in accordance with the restrictions of Section 9.3.  
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 duration of 11 msec (half sinewave)  
• 20 Gs at a duration of 2 msec (half sinewave)  
• 60 Gs at a duration of 2 msec (half sinewave) when performing reads only  
Cheetah 15K.7 SAS Product Manual, Rev. A  
29  
                             
Shock may be applied in the X, Y, or Z axis. Shock is not to be repeated more than once every 2 seconds.  
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 duration of 11 msec (half sinewave). Shock occurring at abnormal lev-  
els may promote degraded operational performance during the abnormal shock period. Specified  
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 once every 2 seconds.  
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 the three values below, shall not exhibit device  
damage or performance degradation.  
• 80 Gs at a duration of 11 msec (half sinewave)  
• 300 Gs at a duration of 2 msec (half sinewave)  
• 150 Gs at a duration of 0.5 msec (half sinewave)  
Shock may be applied in the X, Y, or Z axis.  
d. Packaged  
disk 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.  
30  
Cheetah 15K.7 SAS Product Manual, Rev. A  
         
Z
X
Y
X
Z
Y
Figure 8.  
6.4.4.2  
Recommended mounting  
Vibration  
a. Operating—normal  
The drive as installed for normal operation, shall comply with the complete specified performance while  
subjected to continuous vibration not exceeding  
10 – 300 Hz  
301– 500 Hz  
1.0 G RMS (0 to peak)  
0.5 G RMS (0 to peak)  
Vibration may be applied in the X, Y, or Z axis.  
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  
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  
5 – 500 Hz  
10 - 300 Hz  
0.75 G (0 to peak)  
0.0029 G2/Hz  
c. Non-operating  
Cheetah 15K.7 SAS Product Manual, Rev. A  
31  
         
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  
22 - 350 Hz  
350 - 500 Hz  
0.25 G (0 to peak, linear, swept sine, 0.5 octive/min)  
3 G (0 to peak, linear, swept sine, 0.5 octive/min)  
1 G (0 to peak, linear, swept sine, 0.5 octive/min)  
Vibration may be applied in the X, Y, or Z axis.  
6.4.5  
Acoustics  
Sound power during idle mode shall be 3.4 bels typical when measured to ISO 7779 specification. Sound  
power while operating shall be 3.8 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.  
6.4.6  
Air cleanliness  
The drive is designed to operate in a typical office environment with minimal environmental control.  
6.4.7  
Corrosive environment  
Seagate electronic drive components pass accelerated corrosion testing equivalent to 10 years exposure to  
light industrial environments containing sulfurous gases, chlorine and nitric oxide, classes G and H per ASTM  
B845. However, this accelerated testing cannot duplicate every potential application environment.  
Users should use caution exposing any electronic components to uncontrolled chemical pollutants and corro-  
sive chemicals as electronic drive component reliability can be affected by the installation environment. The sil-  
ver, copper, nickel and gold films used in Seagate products are especially sensitive to the presence of sulfide,  
chloride, and nitrate contaminants. Sulfur is found to be the most damaging. In addition, electronic components  
should never be exposed to condensing water on the surface of the printed circuit board assembly (PCBA) or  
exposed to an ambient relative humidity greater than 95%. Materials used in cabinet fabrication, such as vulca-  
nized rubber, that can outgas corrosive compounds should be minimized or eliminated. The useful life of any  
electronic equipment may be extended by replacing materials near circuitry with sulfide-free alternatives.  
6.4.8  
RoHS compliance statement  
The European Union Restriction of Hazardous Substances (RoHS) Directive restricts the presence of chemical  
substances, including Lead (Pb), in electronic products effective July 2006.  
A number of parts and materials in Seagate products are procured from external suppliers. We rely on the  
representations of our suppliers regarding the presence of RoHS substances in these parts and materials. Our  
supplier contracts require compliance with our chemical substance restrictions, and our suppliers document  
their compliance with our requirements by providing material content declarations for all parts and materials for  
the disc drives documented in this publication. Current supplier declarations include disclosure of the inclusion  
of any RoHS-regulated substance in such parts or materials.  
Seagate also has internal systems in place to ensure ongoing compliance with the RoHS Directive and all laws  
and regulations which restrict chemical content in electronic products. These systems include standard operat-  
ing procedures that ensure that restricted substances are not utilized in our manufacturing operations, labora-  
tory analytical validation testing, and an internal auditing process to ensure that we comply with all standard  
operating procedures.  
32  
Cheetah 15K.7 SAS Product Manual, Rev. A  
                               
6.4.9  
Electromagnetic susceptibility  
See Section 2.1.1.1.  
6.5  
Mechanical specifications  
Refer to Figure 9 for detailed physical dimensions. See Section 9.3, “Drive mounting.”  
Height: 1.03 in  
Width: 4.00 in  
26.10 mm  
101.60 mm  
147 mm  
Depth: 5.79 in  
Weight (max): 1.76 pounds  
0.80 kilograms  
26.11 MAX  
(1.028 MAX)  
2X 20.14  
(2X .793)  
24.00  
(.945)  
6.35 (.250)  
4.22 X 90 ( .166 X 90 )  
0.36  
2X 28.45  
(2X 1.120)  
(
.014)  
2X 70.05 (2X 2.758)  
122.00 (4.803)  
2X 130.05 (2X 5.120)  
UNITS OF MEASURE: mm (inches)  
146.99 MAX (5.787 MAX)  
131.17 (5.164)  
4.57 MIN BLIND  
( .18 MIN BLIND)  
85.60 (3.370)  
41.15 (1.620)  
4.22 X 90 ( .166 X 90 )  
20.14  
(.793)  
0.36  
2X 29.21  
(2X 1.150)  
(
.014)  
1.45 (.057)  
3.17 (.125)  
DRIVE  
CENTER  
LINE  
101.60 +/- .25  
(4.000 +/- .010)  
50.80  
(2.000)  
2X 100.13  
(2X 3.942)  
20.68 (.814)  
98.42  
(3.875)  
33.40  
(1.315)  
0.76  
.030)  
(
0.13  
(.005)  
36.37  
(1.432)  
0.13  
(.005)  
3.50 +/- .38  
(.138 +/- .015)  
0.99  
(.039)  
0.41  
0.25  
(.010)  
(.016)  
Figure 9.  
Physical dimensions  
Cheetah 15K.7 SAS Product Manual, Rev. A  
33  
             
7.0  
About self-encrypting drives  
Self-encrypting drives (SEDs) offer encryption and security services for the protection of stored data, com-  
monly known as “protection of data at rest.” These drives are compliant with the Trusted Computing Group  
(TCG) Enterprise Storage Specifications as detailed in Section 2.4.  
The Trusted Computing Group (TCG) is an organization sponsored and operated by companies in the com-  
puter, storage and digital communications industry. Seagate’s SED models comply with the standards pub-  
lished by the TCG.  
To use the security features in the drive, the host must be capable of constructing and issuing the following two  
SCSI commands:  
• Security Protocol Out  
• Security Protocol In  
These commands are used to convey the TCG protocol to and from the drive in their command payloads.  
7.1  
Data encryption  
Encrypting drives use one inline encryption engine for each port, employing AES-128 data encryption in Cipher  
Block Chaining (CBC) mode to encrypt all data prior to being written on the media and to decrypt all data as it  
is read from the media. The encryption engines are always in operation, cannot be disabled, and do not detract  
in any way from the performance of the drive.  
The 32-byte Data Encryption Key (DEK) is a random number which is generated by the drive, never leaves the  
drive, and is inaccessible to the host system. The DEK is itself encrypted when it is stored on the media and  
when it is in volatile temporary storage (DRAM) external to the encryption engine. A unique data encryption  
key is used for each of the drive's possible16 data bands (see Section 7.5).  
7.2  
Controlled access  
The drive has two security partitions (SPs) called the "Admin SP" and the "Locking SP." These act as gate-  
keepers to the drive security services. Security-related commands will not be accepted unless they also supply  
the correct credentials to prove the requester is authorized to perform the command.  
7.2.1  
Admin SP  
The Admin SP allows the drive's owner to enable or disable firmware download operations (see Section 7.4).  
Access to the Admin SP is available using the SID (Secure ID) password or the MSID (Makers Secure ID)  
password.  
7.2.2  
Locking SP  
The Locking SP controls read/write access to the media and the cryptographic erase feature. Access to the  
Locking SP is available using the BandMasterX or EraseMaster passwords. Since the drive owner can define  
up to 16 data bands on the drive, each data band has its own password called BandMasterX where X is the  
number of the data band (0 through 15).  
34  
Cheetah 15K.7 SAS Product Manual, Rev. A  
                                                             
7.2.3  
Default password  
When the drive is shipped from the factory, all passwords are set to the value of MSID. This 32-byte random  
value is printed on the drive label and it can be read by the host electronically over the I/O. After receipt of the  
drive, it is the responsibility of the owner to use the default MSID password as the authority to change all other  
passwords to unique owner-specified values.  
7.3  
Random number generator (RNG)  
The drive has a 32-byte hardware RNG that it is uses to derive encryption keys or, if requested to do so, to pro-  
vide random numbers to the host for system use, including using these numbers as Authentication Keys (pass-  
words) for the drive’s Admin and Locking SPs.  
7.4  
Drive locking  
In addition to changing the passwords, as described in Section 7.2.3, the owner should also set the data  
access controls for the individual bands.  
The variable "LockOnReset" should be set to "PowerCycle" to ensure that the data bands will be locked if  
power is lost. This scenario occurs if the drive is removed from its cabinet. The drive will not honor any data  
read or write requests until the bands have been unlocked. This prevents the user data from being accessed  
without the appropriate credentials when the drive has been removed from its cabinet and installed in another  
system.  
When the drive is shipped from the factory, the firmware download port is locked and the drive will reject any  
attempt to download new firmware. The drive owner must use the SID credential to unlock the firmware down-  
load port before firmware updates will be accepted.  
7.5  
Data bands  
When shipped from the factory, the drive is configured with a single data band called Band 0 (also known as  
the Global Data Band) which comprises LBA 0 through LBA max. The host may allocate Band1 by specifying a  
start LBA and an LBA range. The real estate for this band is taken from the Global Band. An additional 14 Data  
Bands may be defined in a similar way (Band2 through Band15) but before these bands can be allocated LBA  
space, they must first be individually enabled using the EraseMaster password.  
Data bands cannot overlap but they can be sequential with one band ending at LBA (x) and the next beginning  
at LBA (x+1).  
Each data band has its own drive-generated encryption key and its own user-supplied password. The host may  
change the Encryption Key (see Section 7.6) or the password when required. The bands should be aligned to  
4K LBA boundaries.  
7.6  
Cryptographic erase  
A significant feature of SEDs is the ability to perform a cryptographic erase. This involves the host telling the  
drive to change the data encryption key for a particular band. Once changed, the data is no longer recoverable  
since it was written with one key and will be read using a different key. Since the drive overwrites the old key  
with the new one, and keeps no history of key changes, the user data can never be recovered. This is tanta-  
mount to an instantaneous data erase and is very useful if the drive is to be scrapped or redispositioned.  
7.7  
Authenticated firmware download  
In addition to providing a locking mechanism to prevent unwanted firmware download attempts, the drive also  
only accepts download files which have been cryptographically signed by the appropriate Seagate Design  
Center.  
Three conditions must be met before the drive will allow the download operation:  
1. The download must be an SED file. A standard (base) drive (non-SED) file will be rejected.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
35  
                                       
2. The download file must be signed and authenticated.  
3. As with a non-SED drive, the download file must pass the acceptance criteria for the drive. For example it  
must be applicable to the correct drive model, and have compatible revision and customer status.  
7.8  
Power requirements  
The standard drive models and the SED drive models have identical hardware, however the security and  
encryption portion of the drive controller ASIC is enabled and functional in the SED models. This represents a  
small additional drain on the 5V supply of about 30mA and a commensurate increase of about 150mW in  
power consumption. There is no additional drain on the 12V supply. See the tables in Section 6.2 for power  
requirements on the standard (non-SED) drive models.  
7.9  
Supported commands  
The SED models support the following two commands in addition to the commands supported by the standard  
(non-SED) models as listed in Table 19:  
• Security Protocol Out (B5h)  
• Security Protocol In (A2h)  
36  
Cheetah 15K.7 SAS Product Manual, Rev. A  
   
8.0  
Defect and error management  
Seagate continues to use innovative technologies to manage defects and errors. These technologies are  
designed to increase data integrity, perform drive self-maintenance, and validate proper drive operation.  
SCSI defect and error management involves drive internal defect/error management and SAS system error  
considerations (errors in communications between the initiator and the drive). In addition, Seagate provides  
the following technologies used to increase data integrity and drive reliability:  
• Background Media Scan (see Section 8.4)  
• Media Pre-Scan (see Section 8.5)  
• Deferred Auto-Reallocation (see Section 8.6)  
• Idle Read After Write (see Section 8.7)  
The read error rates and specified storage capacities are not dependent on host (initiator) defect management  
routines.  
8.1  
Drive internal defects/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 SAS Interface Manual. Also, more  
information on the drive Error Recovery philosophy is presented in the SAS Interface Manual.  
8.2  
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 SAS 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 13 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.7 SAS Product Manual, Rev. A  
37  
                 
Table 16 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  
38  
Cheetah 15K.7 SAS Product Manual, Rev. A  
Table 16:  
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  
35.91  
39.9  
1
59.85  
1
2
203.49  
231.42  
295.26  
327.18  
359.10  
446.88  
538.65  
570.57  
598.50  
1,534.97  
2
3
3
51.87  
79.8  
4
4
5
5 (default)  
107.73  
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 degradation of the unrecov-  
ered error rate which may exceed the value given in this product manual. A setting of zero (0) will result in  
the drive not performing error recovery.  
For example, suppose the read/write recovery page has the RC bit set to 0, read retry count set to 4, and  
the recovery time limit field (Mode Sense page 01, bytes 10 and 11) set to FF FF hex (maximum). A four  
LBA Read command is allowed to take up to 253.11 msec recovery time for each of the four LBAs in the  
command. If the recovery time limit is set to 00 C8 hex (200 msec decimal) a four LBA read command is  
allowed to take up to 200 msec for all error recovery within that command. The use of the Recovery Time  
Limit field allows finer granularity on control of the time spent in error recovery. The recovery time limit  
only starts counting when the drive is executing error recovery and it restarts on each command. There-  
fore, 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.  
8.3  
SAS system errors  
Information on the reporting of operational errors or faults across the interface is given in the SAS Interface  
Manual. The SSP 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 SAS Interface Manual. Status reporting plays a  
role in systems error management and its use in that respect is described in sections where the various com-  
mands are discussed.  
8.4  
Background Media Scan  
Background Media Scan (BMS) is a self-initiated media scan. BMS is defined in the T10 document SPC-4  
available from the T10 committee. BMS performs sequential reads across the entire pack of the media while  
the drive is idle. In RAID arrays, BMS allows hot spare drives to be scanned for defects prior to being put into  
service by the host system. On regular duty drives, if the host system makes use of the BMS Log Page, it can  
avoid placing data in suspect locations on the media. Unreadable and recovered error sites will be logged or  
reallocated per ARRE/AWRE settings.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
39  
       
With BMS, the host system can consume less power and system overhead by only checking BMS status and  
results rather than tying up the bus and consuming power in the process of host-initiated media scanning activ-  
ity.  
Since the background scan functions are only done during idle periods, BMS causes a negligible impact to sys-  
tem performance. The first BMS scan for a newly manufactured drive is performed as quickly as possible to  
verify the media and protect data by setting the “Start time after idle” to 5ms, all subsequent scans begin after  
500ms of idle time. Other features that normally use idle time to function will function normally because BMS  
functions for bursts of 800ms and then suspends activity for 100ms to allow other background functions to  
operate.  
BMS interrupts immediately to service host commands from the interface bus while performing reads. BMS will  
complete any BMS-initiated error recovery prior to returning to service host-initiated commands. Overhead  
associated with a return to host-servicing activity from BMS only impacts the first command that interrupted  
BMS, this results in a typical delay of about 1 ms.  
8.5  
Media Pre-Scan  
Media Pre-Scan is a feature that allows the drive to repair media errors that would otherwise have been found  
by the host system during critical data accesses early in the drive’s life. The default setting for Media Pre-Scan  
is enabled on standard products. Media Pre-Scan checks each write command to determine if the destination  
LBAs have been scanned by BMS. If the LBAs have been verified, the drive proceeds with the normal write  
command. If the LBAs have not been verified by BMS, Pre-Scan will convert the write to a write verify to certify  
that the data was properly written to the disk.  
Note. During Pre-Scan write verify commands, write performance may decrease by 50% until Pre-Scan  
completes. Write performance testing should be performed after Pre-Scan is complete. This may  
be checked by reading the BMS status.  
To expedite the scan of the full pack and subsequently exit from the Pre-Scan period, BMS will begin scanning  
immediately when the drive goes to idle during the Pre-Scan period. In the event that the drive is in a high  
transaction traffic environment and is unable to complete a BMS scan within 24 power on hours BMS will dis-  
able Pre-Scan to restore full performance to the system.  
8.6  
Deferred Auto-Reallocation  
Deferred Auto-Reallocation (DAR) simplifies reallocation algorithms at the system level by allowing the drive to  
reallocate unreadable locations on a subsequent write command. Sites are marked for DAR during read oper-  
ations performed by the drive. When a write command is received for an LBA marked for DAR, the auto-reallo-  
cation process is invoked and attempts to rewrite the data to the original location. If a verification of this rewrite  
fails, the sector is re-mapped to a spare location.  
This is in contrast to the system having to use the Reassign Command to reassign a location that was unread-  
able and then generate a write command to rewrite the data. DAR is most effective when AWRE and ARRE  
are enabled—this is the default setting from the Seagate factory. With AWRE and ARRE disabled DAR is  
unable to reallocate the failing location and will report an error sense code indicating that a write command is  
being attempted to a previously failing location.  
8.7  
Idle Read After Write  
Idle Read After Write (IRAW) utilizes idle time to verify the integrity of recently written data. During idle periods,  
no active system requests, the drive reads recently written data from the media and compares it to valid write  
command data resident in the drives data buffer. Any sectors that fail the comparison result in the invocation of  
a rewrite and auto-reallocation process. The process attempts to rewrite the data to the original location. If a  
verification of this rewrite fails, the sector is re-mapped to a spare location.  
40  
Cheetah 15K.7 SAS Product Manual, Rev. A  
               
9.0  
Installation  
Cheetah 15K.7 disk drive installation is a plug-and-play process. There are no jumpers, switches, or termina-  
tors on the drive.  
SAS drives are designed to be used in a host system that provides a SAS-compatible backplane with bays  
designed to accommodate the drive. In such systems, the host system typically provides a carrier or tray into  
which you need to mount the drive. Mount the drive to the carrier or tray provided by the host system using four  
6-32 UNC screws. Do not over-tighten or force the screws. You can mount the drive in any orientation.  
Note. SAS drives are designed to be attached to the host system without I/O or power cables. If you  
intend the use the drive in a non-backplane host system, connecting the drive using high-quality  
cables is acceptable as long as the I/O cable length does not exceed 4 meters (13.1 feet).  
Slide the carrier or tray into the appropriate bay in your host system using the instructions provided by the host  
system. This connects the drive directly to your system’s SAS connector. The SAS connector is normally  
located on a SAS backpanel. See Section 10.4.1 for additional information about these connectors.  
Power is supplied through the SAS connector.  
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.  
9.1  
Drive orientation  
The drive may be mounted in any orientation. All drive performance characterizations, however, have been  
done with the drive in horizontal (disks level) and vertical (drive on its side) orientations, which are the two pre-  
ferred mounting orientations.  
9.2  
Cooling  
Cabinet cooling must be designed by the customer so that the ambient temperature immediately surrounding  
the drive will not exceed temperature conditions specified in Section 6.4.1, "Temperature."  
The rack, cabinet, or drawer environment for the drive must provide heat removal from the electronics and  
head and disk assembly (HDA). You should confirm that adequate heat removal is provided using the temper-  
ature measurement guidelines described in Section 6.4.1.  
Forced air flow may be required to keep temperatures at or below the temperatures specified in Section 6.4.1  
in which case the drive should be oriented, or air flow directed, so that the least amount of air flow resistance is  
created while providing air flow to the electronics and HDA. Also, the shortest possible path between the air  
inlet and exit should be chosen to minimize the travel length of air heated by the drive and other heat sources  
within the rack, cabinet, or drawer environment.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
41  
                                   
If forced air is determined to be necessary, possible air-flow patterns are shown in Figure 10. The air-flow pat-  
terns are created by one or more 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 guide-  
lines 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 10. Air flow  
9.3  
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.  
9.4  
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.  
42  
Cheetah 15K.7 SAS Product Manual, Rev. A  
                               
10.0  
Interface requirements  
This section partially describes the interface requirements as implemented on Cheetah 15K.7 drives. Addi-  
tional information is provided in the SAS Interface Manual (part number 100293071).  
10.1  
SAS features  
This section lists the SAS-specific features supported by Cheetah 15K.7 drives.  
10.1.1  
task management functions  
Table 17 lists the SAS task management functions supported.  
Table 17:  
SAS task management functions supported  
Task name  
Abort Task  
Supported  
Yes  
Clear ACA  
Yes  
Clear task set  
Abort task set  
Yes  
Yes  
Logical Unit Reset  
Query Task  
Yes  
Yes  
10.1.2  
task management responses  
Table 18 lists the SAS response codes returned for task management functions supported.  
Table 18:  
Task management response codes  
Function name  
Function complete  
Invalid frame  
Response code  
00  
02  
04  
05  
08  
09  
Function not supported  
Function failed  
Function succeeded  
Invalid logical unit  
Cheetah 15K.7 SAS Product Manual, Rev. A  
43  
                                 
10.2  
Dual port support  
Cheetah 15K.7 SAS drives have two independent ports. These ports may be connected in the same or differ-  
ent SCSI domains. Each drive port has a unique SAS address.  
The two ports have the capability of independent port clocking (e.g. both ports can run at 6Gbit/sec or the first  
port can run at 6Gbit/sec while the second port runs at 3Gbit/sec.) The supported link rates are 1.5, 3.0, or 6.0  
Gbits/sec.  
Subject to buffer availability, the Cheetah 15K.7 drives support:  
• Concurrent port transfers—The drive supports receiving COMMAND, TASK management transfers on both  
ports at the same time.  
Full duplex—The drive supports sending XFER_RDY, DATA and RESPONSE transfers while receiving frames  
on both ports.  
10.3  
SCSI commands supported  
Table 19 lists the SCSI commands supported by Cheetah 15K.7 drives.  
Table 19: Commands supported by Cheetah 15K.6 SAS family drives  
Command name  
Command code  
Supported  
Change Definition  
Compare  
40h  
39h  
18h  
3Ah  
04h  
N
N
N
N
Y
N
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
Y
N
Y
Copy  
Copy and Verify  
Format Unit [1]  
DPRY bit supported  
DCRT bit supported  
STPF bit supported  
IP bit supported  
DSP bit supported  
IMMED bit supported  
VS (vendor specific)  
Inquiry  
12h  
Date Code page (C1h)  
Device Behavior page (C3h)  
Firmware Numbers page (C0h)  
Implemented Operating Def page (81h)  
Jumper Settings page (C2h)  
Supported Vital Product Data page (00h)  
Unit Serial Number page (80h)  
Lock-unlock cache  
Log Select  
36h  
4Ch  
PCR bit  
DU bit  
DS bit  
44  
Cheetah 15K.7 SAS Product Manual, Rev. A  
       
Table 19:  
Commands supported by Cheetah 15K.6 SAS family drives (continued)  
Command name  
Command code  
Supported  
TSD bit  
Y
ETC bit  
N
N
N
Y
TMC bit  
LP bit  
Log Sense  
4Dh  
Application Client Log page (0Fh)  
Buffer Over-run/Under-run page (01h)  
Cache Statistics page (37h)  
Factory Log page (3Eh)  
Y
N
Y
Y
Last n Deferred Errors or Asynchronous Events page (0Bh)  
Last n Error Events page (07h)  
Non-medium Error page (06h)  
Pages Supported list (00h)  
Read Error Counter page (03h)  
Read Reverse Error Counter page (04h)  
Self-test Results page (10h)  
Background Medium Scan page (15h)  
Start-stop Cycle Counter page (0Eh)  
Temperature page (0Dh)  
N
N
Y
Y
Y
N
Y
Y
Y
Y
Verify Error Counter page (05h)  
Write error counter page (02h)  
Mode Select (same pages as Mode Sense 1Ah)  
Mode Select (10) (same pages as Mode Sense 1Ah)  
Mode Sense  
Y
Y
15h  
55h  
1Ah  
Y [2]  
Y
Y [2]  
Y
Caching Parameters page (08h)  
Control Mode page (0Ah)  
Y
Disconnect/Reconnect (02h)  
Error Recovery page (01h)  
Format page (03h)  
Y
Y
Y
Information Exceptions Control page (1Ch)  
Background Scan mode subpage (01h)  
Notch and Partition Page (0Ch)  
Protocol-Specific Port page (19h)  
Power Condition page (1Ah)  
Rigid disk Drive Geometry page (04h)  
Unit Attention page (00h)  
Y
Y
N
Y
Y
Y
Y
Verify Error Recovery page (07h)  
Xor Control page (10h)  
Y
N
Cheetah 15K.7 SAS Product Manual, Rev. A  
45  
Table 19:  
Commands supported by Cheetah 15K.6 SAS family drives (continued)  
Command name  
Command code  
Supported  
Mode Sense (10) (same pages as Mode Sense 1Ah)  
Prefetch  
5Ah  
34h  
08h  
3Ch  
25h  
37h  
B7h  
28h  
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
Y
N
Y
N
N
N
Y
Y
Y
Y
Y
N
Y
Y
Read  
Read Buffer (modes 0, 2, 3, Ah and Bh supported)  
Read Capacity  
Read Defect Data (10)  
Read Defect Data (12)  
Read Extended  
DPO bit supported  
FUA bit supported  
Read Long  
3Eh  
07h  
1Ch  
Reassign Blocks  
Receive Diagnostic Results  
Supported Diagnostics pages (00h)  
Translate page (40h)  
Release  
17h  
57h  
03h  
Release (10)  
Request Sense  
Actual Retry Count bytes  
Extended Sense  
Field Pointer bytes  
Reserve  
16h  
56h  
3rd Party Reserve  
Extent Reservation  
Reserve (10)  
3rd Party Reserve  
Extent Reservation  
Rezero Unit  
01h  
31h  
30h  
32h  
0Bh  
2Bh  
1Dh  
Search Data Equal  
Search Data High  
Search Data Low  
Seek  
Seek Extended  
Send Diagnostics  
Supported Diagnostics pages (00h)  
Translate page (40h)  
Set Limits  
33h  
1Bh  
35h  
Start Unit/Stop Unit (spindle ceases rotating)  
Synchronize Cache  
46  
Cheetah 15K.7 SAS Product Manual, Rev. A  
Table 19:  
Commands supported by Cheetah 15K.6 SAS family drives (continued)  
Command name  
Test Unit Ready  
Verify  
Command code  
Supported  
00h  
2Fh  
Y
Y
Y
Y
Y
Y
Y
Y
BYTCHK bit  
Write  
0Ah  
2Eh  
Write and Verify  
DPO bit  
Write Buffer (modes 0, 2, supported)  
3Bh  
2Ah  
Firmware Download option  
(modes 5, 7, Ah and Bh supported) [3]  
Write Extended  
DPO bit  
Y
Y
Y
Y
Y
N
N
N
N
N
FUA bit  
Write Long  
Write Same  
PBdata  
3Fh  
41h  
LBdata  
XDRead  
XDWrite  
52h  
50h  
51h  
XPWrite  
[1] Cheetah 15K.7 drives can format to 512, 520, 524, or 528 bytes per logical block.  
[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.7 SAS Product Manual, Rev. A  
47  
   
10.3.1  
Inquiry data  
Table lists the Inquiry command data that the drive should return to the initiator per the format given in the SAS  
Interface Manual.  
Table 20:  
Bytes  
Cheetah 15K.7 inquiry data  
Data (hex)  
0-15  
00  
[53  
R#  
00  
00  
00  
00  
00  
54  
R#  
00  
00  
00  
43  
xx**  
33  
12  
36  
R#  
00  
00  
00  
70  
20  
68  
8B  
30  
S#  
00  
00  
00  
79  
53  
74  
00  
30  
S#  
00  
00  
00  
72  
65  
73  
PP  
30  
S#  
00  
00  
00  
69  
61  
20  
02  
35  
S#  
00  
00  
00  
67  
67  
72  
53  
37  
S#  
00  
00  
00  
68  
61  
65  
45  
53  
S#  
00  
00  
00  
74  
74  
73  
41  
53]  
S#  
00  
00  
00  
20  
65  
65  
47  
20  
S#  
00  
00  
00  
28  
20  
72  
41  
20  
00  
00  
00  
00  
63  
41  
76  
54  
20  
00  
00  
00  
00  
29  
6C  
65  
45  
20  
00  
00  
00  
00  
20  
6C  
64  
20  
20  
00  
00  
00  
00  
Vendor ID  
Product ID  
1
16-31  
32-47  
48-63  
64-79  
80-95  
96-111  
112-127  
128-143  
R#  
00  
00  
00  
6F  
32* *Copyright  
30* 30* 39*  
72 69 67  
20  
20  
notice  
*
Copyright year (changes with actual year).  
**  
SCSI Revision support. Refer to the appropiate SPC release documentation for definitions.  
PP 10 = Inquiry data for an Inquiry command received on Port A.  
30 = 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 ST3600057SS.  
48  
Cheetah 15K.7 SAS Product Manual, Rev. A  
   
10.3.2  
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.  
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 10.3.2.1, 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 SAS Interface Manual).  
Definitions:  
DEF = Default value. Standard OEM drives are shipped configured this way.  
CHG = Changeable bits; indicates if default value is changeable.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
49  
   
10.3.2.1  
ST3600057SS and ST3600957SS Mode Sense data  
MODE DATA HEADER:  
01 6e 00 10 00 00 00 08  
BLOCK DESCRIPTOR:  
45 dd 2f b0 00 00 02 00  
MODE PAGES:  
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  
DEF 82 0e 00 00 00 00 00 00 00 00 01 3a 00 00 00 00  
CHG 82 0e 00 00 00 00 00 00 00 00 ff ff 00 00 00 00  
DEF 83 16 bb d0 00 00 00 00 03 80 04 c4 02 00 00 01 00 c0 00 4c 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  
DEF 84 16 01 8a 9a 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  
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  
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00  
CHG 88 12 a5 00 00 00 ff ff ff ff 00 00 20 00 00 00 00 00 00 00  
DEF 8a 0a 02 00 00 00 00 00 00 00 19 00  
CHG 8a 0a 03 f0 00 00 00 00 00 00 00 00  
DEF 18 06 06 00 00 00 00 00  
CHG 18 06 00 00 00 00 00 00  
DEF 99 06 06 00 07 d0 00 00  
CHG 99 06 10 00 ff ff ff ff  
DEF d9 01 00 64 00 06 00 02 00 00 00 00 10 29 0e 00 50 00 c5 00 00 68 64 a9 50 06 05 b0 00  
29 2d d5 07 00 00 00 00 00 00 00 88 aa 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00  
00 10 29 0e 00 50 00 c5 00 00 68 64 aa 50 06 05 b0 00 29 2d d4 06 00 00 00 00 00 00 00 88  
aa 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
CHG d9 01 00 64 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 f0 f0 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 00 00 00 00 f0  
f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
DEF 59 02 00 0c 00 06 03 e8 00 00 00 00 00 00 00 00  
CHG 59 02 00 0c 00 00 ff ff 00 00 00 00 00 00 00 00  
DEF 59 03 00 2c 00 06 00 02 00 00 00 10 80 ac 00 01 80 ac 00 01 00 00 00 00 00 00 09 00 00  
01 00 10 80 ac 00 01 80 ac 00 01 00 00 00 00 00 00 09 00  
CHG 59 03 00 2c 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 00 00  
DEF 9a 0a 00 02 00 00 00 05 00 00 8c a0  
50  
Cheetah 15K.7 SAS Product Manual, Rev. A  
 
CHG 9a 0a 00 03 ff ff ff ff ff ff ff ff  
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  
DEF dc 01 00 0c 01 01 00 18 00 18 00 00 00 00 00 00  
CHG dc 01 00 0c 00 01 ff ff ff ff 00 00 00 00 00 00  
DEF 80 06 00 80 0f 00 00 00  
CHG 80 06 b7 c0 8f 00 00 00  
READ CAPACITY DATA:  
READ BUFFER  
0 1 2 3 4 5 6 7 8 9 A B C D E F  
ASCII  
000000: 45 DD 2F AF 00 00 02 00 __ __ __ __ __ __ __ __  
Cheetah 15K.7 SAS Product Manual, Rev. A  
51  
10.3.2.2  
ST3450857SS and ST3450757SS Mode Sense data  
MODE DATA HEADER:  
01 76 00 10 00 00 00 08  
BLOCK DESCRIPTOR:  
34 65 f8 70 00 00 02 00  
MODE PAGES:  
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  
DEF 82 0e 00 00 00 00 00 00 00 00 01 3a 00 00 00 00  
CHG 82 0e 00 00 00 00 00 00 00 00 ff ff 00 00 00 00  
DEF 83 16 bb d0 00 00 00 00 03 80 04 c4 02 00 00 01 00 c0 00 4c 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  
DEF 84 16 01 8a 9a 06 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  
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  
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00  
CHG 88 12 a5 00 00 00 ff ff ff ff 00 00 20 00 00 00 00 00 00 00  
DEF 8a 0a 02 00 00 00 00 00 00 00 12 c0  
CHG 8a 0a 03 f0 00 00 00 00 00 00 00 00  
DEF 18 06 06 00 00 00 00 00  
CHG 18 06 00 00 00 00 00 00  
DEF 99 0e 06 00 07 d0 00 00 00 00 00 00 00 00 00 00  
CHG 99 0e 10 00 ff ff ff ff 00 00 00 00 00 00 00 00  
DEF d9 01 00 64 00 06 00 02 00 00 00 00 10 29 0e 00 50 00 c5 00 00 15 4b 65 50 06 05 b0 00  
29 28 55 07 00 00 00 00 00 00 00 88 aa 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00  
00 10 29 0e 00 50 00 c5 00 00 15 4b 66 50 06 05 b0 00 29 28 54 06 00 00 00 00 00 00 00 88  
aa 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
CHG d9 01 00 64 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 f0 f0 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 00 00 00 00 f0  
f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
DEF 59 02 00 0c 00 06 03 e8 00 00 00 00 00 00 00 00  
CHG 59 02 00 0c 00 00 ff ff 00 00 00 00 00 00 00 00  
DEF 59 03 00 2c 00 06 00 02 00 00 00 10 80 ac 00 01 80 ac 00 01 00 00 00 00 00 00 09 00 00  
01 00 10 80 ac 00 01 80 ac 00 01 00 00 00 00 00 00 09 00  
CHG 59 03 00 2c 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 00 00  
DEF 9a 0a 00 02 00 00 00 05 00 00 8c a0  
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00  
52  
Cheetah 15K.7 SAS Product Manual, Rev. A  
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  
DEF dc 01 00 0c 01 01 00 18 00 18 00 00 00 00 00 00  
CHG dc 01 00 0c 00 01 ff ff ff ff 00 00 00 00 00 00  
DEF 80 06 00 80 0f 00 00 00  
CHG 80 06 b7 c0 8f 00 00 00  
READ CAPACITY DATA:  
READ BUFFER  
0 1 2 3 4 5 6 7 8 9 A B C D E F  
000000: 34 65 F8 6F 00 00 02 00  
Cheetah 15K.7 SAS Product Manual, Rev. A  
53  
10.3.2.3  
ST3300657SS and ST3300557SS Mode Sense data  
MODE DATA HEADER:  
01 76 00 10 00 00 00 08  
BLOCK DESCRIPTOR:  
22 ec b2 5c 00 00 02 00  
MODE PAGES:  
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  
DEF 82 0e 00 00 00 00 00 00 00 00 01 3a 00 00 00 00  
CHG 82 0e 00 00 00 00 00 00 00 00 ff ff 00 00 00 00  
DEF 83 16 bb d0 00 00 00 00 03 80 04 c4 02 00 00 01 00 c0 00 4c 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  
DEF 84 16 01 8a 9a 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  
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  
DEF 88 12 14 00 ff ff 00 00 ff ff ff ff 80 20 00 00 00 00 00 00  
CHG 88 12 a5 00 00 00 ff ff ff ff 00 00 20 00 00 00 00 00 00 00  
DEF 8a 0a 02 00 00 00 00 00 00 00 0c 80  
CHG 8a 0a 03 f0 00 00 00 00 00 00 00 00  
DEF 18 06 06 00 00 00 00 00  
CHG 18 06 00 00 00 00 00 00  
DEF 99 0e 06 00 07 d0 00 00 00 00 00 00 00 00 00 00  
CHG 99 0e 10 00 ff ff ff ff 00 00 00 00 00 00 00 00  
DEF d9 01 00 64 00 06 00 02 00 00 00 00 14 0a 0e 00 50 00 c5 00 00 5f 66 d5 50 00 00  
00 80 00 00 00 01 00 00 00 00 00 00 00 88 aa 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
00 01 00 00 14 2a 0e 00 50 00 c5 00 00 5f 66 d6 50 00 00 00 80 00 00 01 03 00 00 00 00  
00 00 00 88 aa 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
CHG d9 01 00 64 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 f0 f0 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 00  
00 00 00 f0 f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00  
DEF 59 02 00 0c 00 06 03 e8 00 00 00 00 00 00 00 00  
CHG 59 02 00 0c 00 00 ff ff 00 00 00 00 00 00 00 00  
DEF 59 03 00 2c 00 06 00 02 00 00 00 10 80 ac 00 01 80 ac 00 01 80 a8 00 00 00 00 0a  
00 00 01 00 10 80 ac 00 01 80 ac 00 01 80 a8 00 00 00 00 0a 00  
CHG 59 03 00 2c 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 00 00  
54  
Cheetah 15K.7 SAS Product Manual, Rev. A  
DEF 9a 0a 00 02 00 00 00 05 00 00 8c a0  
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00  
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  
DEF dc 01 00 0c 01 01 00 18 00 18 00 00 00 00 00 00  
CHG dc 01 00 0c 00 01 ff ff ff ff 00 00 00 00 00 00  
DEF 80 06 00 80 0f 00 00 00  
CHG 80 06 b7 c0 8f 00 00 00  
READ CAPACITY DATA:  
READ BUFFER  
0 1 2 3 4 5 6 7 8 9 A B C D E F  
ASCII  
00000: 22 EC B2 5B 00 00 02 00 __ __ __ __ __ __ __ __  
10.4  
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  
N
N
N
Y
N
Y
Y
Y
Y
N
Y
Automatic contingent allegiance  
Asynchronous event notification  
Synchronized (locked) spindle operation  
Segmented caching  
Zero latency read  
Queue tagging (up to 64 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
Good  
Check condition  
Condition met/good  
Busy  
Cheetah 15K.7 SAS Product Manual, Rev. A  
55  
                                 
Table 22:  
Miscellaneous status  
Supported  
Status  
Y
Y
Y
Y
N
N
Intermediate/good  
Intermediate/condition met/good  
Reservation conflict  
Task set full  
ACA active  
ACA active, faulted initiator  
10.4.1  
SAS physical interface  
Figure 11 shows the location of the SAS device connector J1. Figures 12 and 13 provide the dimensions of the  
SAS device.  
Details of the physical, electrical, and logical characteristics are provided within this section. The operational  
aspects of Seagate’s SAS drives are provided in the SAS Interface Manual..  
SAS Interface  
connector  
Figure 11.  
Physical interface  
56  
Cheetah 15K.7 SAS Product Manual, Rev. A  
                   
0.80 (6X)  
5.92  
7.62  
4.65  
0.52 0.08 x 45  
2.00 (3X)  
0.45 0.03 (7X)  
0.10 M E  
5.08  
42.73 REF.  
41.13 0.15  
0.20B  
0.30 0.05 (2X)  
C
A
B
1.10  
4.00 0.08  
0.15D  
C OF DATUM D  
L
R0.30 0.08 (4X)  
A
0.30 0.05 (4X)  
B
C
SEE Detail1  
B
33.43 0.05  
15.875  
15.875  
1.27 (14X)  
1.27 (6X)  
0.84 0.05 (22X)  
5.08  
0.15B  
4.90 0.08  
0.35MIN  
P15  
S1  
P1  
S7  
C OF DATUM B  
L
Figure 12. SAS connector dimensions  
Cheetah 15K.7 SAS Product Manual, Rev. A  
57  
 
Detail A  
6.10  
S14  
S8  
0.30 0.05 x 45 (5X)  
2.25 0.05  
0.40 0.05 X 45 (3X)  
4.85 0.05  
0.10B  
CORING ALLOWED  
IN THIS AREA.  
E
4.40 0.15  
R0.30 0.08  
45  
C
SEE Detail 2  
1.95 0.08  
A
0.35 0.05  
SECTION C - C  
3.90 0.15  
SECTION A - A  
CONTACT SURFACE FLUSH  
TO DATUM A 0.03  
0.08 0.05  
65  
1.90 0.08  
1.23 0.05  
0.08 0.05  
30  
Detail 2  
2.40 0.08  
0.10 A  
SECTION B - B  
D
Figure 13. SAS connector dimensions  
10.4.2  
Physical characteristics  
This section defines physical interface connector.  
10.4.3  
Connector requirements  
The SAS connector on the drive complies with SFF-8482. Contact your preferred connector manufacturer for  
mating part information.  
The SAS device connector is illustrated in Figures 12 and 13.  
58  
Cheetah 15K.7 SAS Product Manual, Rev. A  
         
10.4.4  
Electrical description  
SAS drives use the device connector for:  
• DC power  
• SAS interface  
• Activity LED  
This connector is designed to either plug directly into a backpanel or accept cables.  
10.4.5  
Pin descriptions  
This section provides a pin-out of the SAS device and a description of the functions provided by the pins.  
Table 23:  
SAS pin descriptions  
Pin  
S1  
Signal name  
Signal type  
Pin  
P1*  
P2*  
P3  
Signal name  
NC (reserved 3.3Volts)  
NC (reserved 3.3Volts)  
NC (reserved 3.3Volts)  
Ground  
Signal type  
Port A Ground  
+Port A_in  
S2*  
S3*  
S4  
Diff. input pair  
Diff output pair  
-Port A_in  
Port A Ground  
-Port A_out  
+Port A_out  
Port A Ground  
Port B Ground  
+Port B_in  
P4  
S5*  
S6*  
S7  
P5  
Ground  
P6  
Ground  
P7  
5 Volts charge  
5 Volts  
S8  
P8*  
P9*  
P10  
S9*  
Diff. input pair  
Diff output pair  
5 Volts  
S10* -Port B_in  
Ground  
S11  
Port A Ground  
P11* Ready LED  
Open collector out  
S12* -Port B_out  
S13* +Port B_out  
P12  
P13  
Ground  
12 Volts charge  
S14  
Port B Ground  
P14* 12 Volts  
P15* 12 Volts  
* - Short pin to support hot plugging  
NC - No connection in the drive.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
59  
                   
10.4.6  
SAS transmitters and receivers  
A typical SAS differential copper transmitter and receiver pair is shown in Figure 14. The receiver is AC cou-  
pling to eliminate ground shift noise.  
.01  
TX  
TY  
RX  
Differential  
Transfer Medium  
Transmitter  
100  
Receiver  
100  
RY  
.01  
Figure 14. SAS transmitters and receivers  
10.4.7  
Power  
The drive receives power (+5 volts and +12 volts) through the SAS device connector.  
Three +12 volt pins provide power to the drive, 2 short and 1 long. 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 possible among the pins.  
Three +5 volt pins provide power to the drive, 2 short and 1 long. The current return for the +5 volt power sup-  
ply is through the common ground pins. The supply current and return current must be distributed as evenly as  
possible among the pins.  
Current to the drive through the long power pins may be limited by the system to reduce inrush current to the  
drive during hot plugging.  
10.5  
Signal characteristics  
This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 23  
for signal type and signal name information.  
10.5.1  
Ready LED Out  
The Ready LED Out signal is driven by the drive as indicated in Table 24.  
Table 24:  
Ready LED Out conditions  
Normal command activity  
LED status  
0
1
Ready LED Meaning bit mode page 19h  
Spun down and no activity  
Off  
On  
On  
Off  
Off  
On  
Off  
On  
Spun down and activity (command executing)  
Spun up and no activity  
Spun up and activity (command executing)  
Spinning up or down  
Blinks steadily  
(50% on and 50% off, 0.5 seconds on and off for 0.5 seconds)  
Format in progress  
Toggles on/off  
Toggles on/off  
Write Same command in progress  
60  
Cheetah 15K.7 SAS Product Manual, Rev. A  
                               
The Ready LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the  
proper +3.3 volt supply through an appropriate current limiting resistor. The LED and the current limiting resis-  
tor are external to the drive. See Table 25 for the output characteristics of the LED drive signals.  
Table 25:  
LED drive signal  
State  
Test condition  
0 V VOH 3.6 V  
= 15 mA  
Output voltage  
LED off, high  
LED on, low  
-100 µA < I < 100 µA  
OH  
I
0 VOL 0.225 V  
OL  
10.5.2  
Differential signals  
The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS  
standard.  
Table 26 defines the general interface characteristics.  
Table 26:  
General interface characteristics  
Characteristic  
Units  
Mbaud  
ps  
1.5 Gbps  
1,500  
666.6  
100  
3.0 Gbps  
3,000  
333.3  
100  
6.0 Gbps  
6,000  
166.6  
100  
Bit rate (nominal)  
Unit interval (UI)(nominal)  
Impedance (nominal, differential )  
Transmitter transients, maximum  
Receiver transients, maximum  
ohm  
V
1.2  
1.2  
1.2  
V
1.2  
1.2  
1.2  
10.6  
SAS-2 Specification compliance  
Seagate SAS-2 drives are entirely compatible with the latest SAS-2 Specification (T10/1760-D) Revision 16.  
The most important characteristic of the SAS-2 drive at 6 Gbps is that the receiver is capable of adapting the  
equalizer to optimize the receive margins. The SAS-2 drive has two types of equalizers:  
1. A Decision Feedback Equalizer (DFE) which utilizes the standard SAS-2 training pattern transmitted dur-  
ing the SNW-3 training gap. The DFE circuit can derive an optimal equalization characteristic to compen-  
sate for many of the receive losses in the system.  
2. A Feed Forward Equalizer (FFE) optimized to provide balanced receive margins over a range of channels  
bounded by the best and worst case channels as defined by the relevant ANSI standard.  
10.7  
Additional information  
Please contact your Seagate representative for SAS electrical details, if required.  
For more information about the Phy, Link, Transport, and Applications layers of the SAS interface, refer to the  
Seagate SAS Interface Manual, part number 100293071.  
For more information about the SCSI commands used by Seagate SAS drives, refer to the Seagate SCSI  
Commands Reference Manual, part number 100293068.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
61  
                   
11.0  
Seagate Technology support services  
Internet  
For information regarding Seagate products and services, visit www.seagate.com.  
Worldwide support is available 24 hours daily by email for your questions.  
Presales Support:  
Technical Support:  
Warranty Support:  
http://www.seagate.com/www/en-us/support/warranty_&_returns_assistance  
mySeagate  
my.seagate.com is the industry's first Web portal designed specifically for OEMs and distributors. It provides  
self-service access to critical applications, personalized content and the tools that allow our partners to man-  
age their Seagate account functions. Submit pricing requests, orders and returns through a single, password-  
protected Web interface-anytime, anywhere in the world.  
spp.seagate.com  
spp.seagate.com supports Seagate resellers with product information, program benefits and sales tools. You  
may register for customized communications that are not available on the web. These communications contain  
product launch, EOL, pricing, promotions and other channel-related information. To learn more about the ben-  
efits or to register, go to spp.seagate.com, any time, from anywhere in the world.  
Global Customer Support  
Presales Support  
Our Presales Support staff can help you determine which Seagate products are best suited for your specific  
application or computer system, as well as product availability and compatibility.  
Technical Support  
Seagate technical support is available to assist you online at support.seagate.com or through one of our call  
centers. Have your system configuration information and your "ST" model/product number available.  
62  
Cheetah 15K.7 SAS Product Manual, Rev. A  
   
Customer Service Operations  
Warranty Service  
Seagate offers worldwide customer support for Seagate products. Seagate distributors, OEMs and other direct  
customers should contact their Seagate Customer Service Operations (CSO) representative for warranty-  
related issues. Resellers or end users of drive products should contact their place of purchase or Seagate war-  
ranty service for assistance. Have your serial number and model or part number available.  
Data Recovery Services  
Seagate offers data recovery services for all formats and all brands of storage media. Our data recovery ser-  
vices labs are currently located throughout the world. . Additional information, including an online request form  
and data loss prevention resources, is available at http://services.seagate.com/index.aspx.  
Authorized Service Centers  
Seagate Service Centers are available on a global basis for the return of defective products. See www.sea-  
gate.com for the service center near you.  
USA/Canada/Latin America support services  
For an extensive list of telephone numbers to technical support, presales and warranty service in USA/  
Canada/Latin America, including business hours, go to the "Contact Us" page on www.seagate.com.  
Global Customer Support  
Presales, Technical, and Warranty Support  
Call CenterToll-freeDirect dial  
USA, Canada,  
and Mexico1-800-SEAGATE+1-405-324-4700  
Data Recovery Services  
Call CenterToll-freeDirect dialFAX  
USA, Canada, 1-800-475-0143+1-905-474-21621-800-475-0158  
and Mexico +1-905-474-2459  
Europe, the Middle East and Africa Support Services  
For an extensive list of telephone numbers to technical support, presales and warranty service in Europe, the  
Middle East and Africa, go to the "Contact Us" page on www.seagate.com.  
Asia/Pacific Support Services  
For an extensive list of telephone numbers to technical support, presales and warranty service in Asia/Pacific,  
go to the "Contact Us" page on www.seagate.com.  
Cheetah 15K.7 SAS Product Manual, Rev. A  
63  
64  
Cheetah 15K.7 SAS Product Manual, Rev. A  
cache segments 10  
caching write data 11  
Canadian Department of Communications 2  
capacity  
unformatted 8  
CBC 34  
check condition status 55  
chemical pollutants 32  
Cipher Block Chaining 34  
class B limit 2  
clear ACA function 43  
clear task set function 43  
commands supported 44  
condensation 29  
Index  
Numerics  
12 volt  
pins 60  
5 volt pins 60  
6 Gbps 61  
A
abort task set function 43  
AC coupling 60  
AC power requirements 19  
ACA active status 56  
ACA active, faulted initiator status 56  
acoustics 32  
condition met/good status 55  
connector  
illustrated 58  
requirements 58  
continuous vibration 32  
cooling 41  
corrosive environment 32  
CRC  
active LED Out signal 60  
actuator  
assembly design 5  
adaptive caching 55  
Admin SP 34  
error 13  
AES-128 data encryption 34  
AFR 7  
air cleanliness 32  
Cryptographic erase 35  
Current profiles 23  
customer service 18  
air flow 41, 42  
illustrated 42  
air inlet 41  
altitude 29  
ambient 29  
ambient temperature 41  
ANSI documents  
Serial Attached SCSI 4  
asynchronous event notification 55  
audible noise 2  
auto write and read reallocation  
programmable 6  
automatic contingent allegiance 55  
average idle current 20, 21, 22  
average rotational latency 8  
D
DAR 40  
Data Bands 35  
data bands 34  
Data encryption 34  
Data Encryption Key 34  
data heads  
read/write 8  
data rate  
internal 8  
data transfer rate 9  
DC power 59  
requirements 19  
Decision Feedback Equalizer 61  
decrypt 34  
B
default MSID password 35  
defect and error management 37  
defects 37  
Background Media Scan 39  
backpanel 59  
Band 0 35  
Deferred Auto-Reallocation 40  
deferred error handling 55  
DEK 34  
BandMasterX 34  
BMS 39  
buffer  
description 5  
data 6  
DFE 61  
space 10  
dimensions 33  
busy status 55  
disc rotation speed 8  
drive 32  
drive characteristics 8  
Drive Locking 35  
C
cache operation 10  
Cheetah 15K.7 SAS Product Manual, Rev. A  
65  
drive mounting 33, 42  
drive select 59  
heat removal 41  
heat source 41  
dual port support 44  
host equipment 42  
hot plugging the drive 13  
humidity 29  
E
humidity limits 28  
electrical  
description of connector 59  
signal characteristics 60  
specifications 19  
electromagnetic compatibility 2  
electromagnetic susceptibility 33  
EMI requirements 2  
encryption engine 34  
encryption key 35  
environment 41  
I
Idle Read After Write 40  
inquiry data 48  
installation 41  
interface  
commands supported 44  
error rate 12  
errors 13  
environmental  
illustrated 56  
limits 28  
physical 56  
requirements 12  
environmental control 32  
EraseMaster 34  
error  
management 37  
rates 12  
errors 37  
requirements 43  
intermediate/condition met/good status 56  
intermediate/good status 56  
internal data rate 8  
internal defects/errors 37  
internal drive characteristics 8  
IRAW 40  
F
J
FCC rules and regulations 2  
features 6  
jumpers 41  
interface 43  
feed forward equalizer 61  
FFE 61  
L
latency  
average rotational 8, 9  
Locking SP 34  
LockOnReset 35  
logical block address 10  
logical block reallocation scheme 6  
logical block size 6, 9  
logical segments 10  
firmware 6  
corruption 47  
firmware download port 35  
flawed sector reallocation 6  
Format command execution time 9  
function  
complete, code 00 43  
not supported, code 05 43  
reject, code 04 43  
M
maintenance 12  
Makers Secure ID 34  
G
maximum delayed motor start 20, 21, 22  
maximum start current 20, 21, 22  
media description 6  
Media Pre-Scan 40  
miscellaneous feature support  
Adaptive caching 55  
Global Data Band 35  
Good status 55  
gradient 29  
ground shift noise 60  
grounding 42  
Asynchronous event notification 55  
Automatic contingent allegiance 55  
Deferred error handling 55  
Parameter rounding 55  
H
HDA 41, 42  
heads  
Queue tagging 55  
read/write data 8  
Reporting actual retry count 55  
66  
Cheetah 15K.7 SAS Product Manual, Rev. A  
Segmented caching 55  
SMP = 1 in Mode Select command 55  
Synchronized (locked) spindle operation 55  
Zero latency read 55  
miscellaneous status support  
ACA active 56  
physical dimensions 33  
physical interface 56  
physical specifications 19  
pin descriptions 59  
power 60  
dissipation 26  
ACA active, faulted initiator 56  
Busy 55  
Check condition 55  
Condition met/good 55  
Good 55  
requirements, AC 19  
requirements, DC 19  
sequencing 23  
power distribution 2  
PowerCycle 35  
Intermediate/condition met/good 56  
Intermediate/good 56  
Reservation conflict 56  
Task set full 56  
prefetch/multi-segmented cache control 10  
preventive maintenance 12  
protection of data at rest 34  
miscorrected media data 12  
Mode sense  
Q
queue tagging 55  
data, table 49  
mounting 42  
R
holes 42  
orientations 41  
MSID 34, 35  
radio interference regulations 2  
Random number generator 35  
RCD bit 10  
read error rates 12, 37  
read/write data heads 8  
receivers 60  
recommended mounting 31  
Recoverable Errors 12  
recovered media data 12  
reference  
N
noise  
audible 2  
noise immunity 23  
non-operating 29, 30, 31  
temperature 29  
non-operating vibration 32  
documents 4  
relative humidity 29  
reliability 7  
O
office environment 32  
operating 29, 31  
specifications 12  
reliability and service 13  
repair and return information 18  
reporting actual retry count 55  
reservation conflict status 56  
resonance 29  
return information 18  
RNG 35  
rotation speed 8  
option selection 59  
out-of-plane distortion 42  
P
package size 30  
package test specification 4  
packaged 30  
parameter rounding 55  
password 34, 35  
passwords 34  
S
safety 2  
PCBA 42  
SAS  
peak bits per inch 8  
peak operating current 20, 21, 22  
peak-to-peak measurements 23  
performance characteristics  
detailed 8  
interface 59  
physical interface 56  
task management functions 43  
SAS documents 4  
SAS Interface Manual 2, 4  
SCSI interface  
general 9  
performance degradation 30  
performance highlights 6  
physical damage 32  
commands supported 44  
Secure ID 34  
security partitions 34  
Cheetah 15K.7 SAS Product Manual, Rev. A  
67  
Security Protocol In 34  
Security Protocol Out 34  
seek error  
non-operating 29  
regulation 2  
See also cooling  
defined 13  
rate 12  
terminate task function 43  
terminators 41  
seek performance characteristics 8  
seek time  
tracks per inch 8  
transmitters 60  
average typical 8  
full stroke typical 8  
single track typical 8  
segmented caching 55  
self-encrypting drives 34  
Self-Monitoring Analysis and Reporting Technology  
transporting the drive 18  
Trusted Computing Group 34  
U
unformatted 7  
Unrecoverable Errors 12  
unrecovered media data 12  
Serial Attached SCSI (SAS) Interface Manual 1  
shielding 2  
V
shipping 18  
shipping container 29  
shock 29, 30  
vibration 29, 31, 32  
and vibration 29  
W
shock mount 42  
SID 34  
warranty 18  
signal  
Z
characteristics 60  
single-unit shipping pack kit 7  
SMART 7, 14  
zero latency read 55  
zone bit recording (ZBR) 6  
SMP = 1 in Mode Select command 55  
SNW-3 training gap 61  
spindle brake 6  
standards 2  
start/stop time 9  
Sulfur 32  
support services 62  
surface stiffness  
allowable for non-flat surface 42  
switches 41  
synchronized spindle  
operation 55  
system chassis 42  
T
task management functions 43  
Abort task set 43  
Clear ACA 43  
Clear task set 43  
terminate task 43  
task management response codes 43  
Function complete 00 43  
Function not supported 05 43  
Function reject 04 43  
task set full status 56  
TCG 34  
technical support services 62  
temperature 28, 41  
limits 28  
68  
Cheetah 15K.7 SAS Product Manual, Rev. A  
Seagate Technology LLC  
920 Disc Drive, Scotts Valley, California 95066-4544, USA  
Publication Number: 100516226, Rev. A, Printed in USA  

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