Seagate Cheetah ST3146854LC User Manual
Product Manual  
Cheetah 15K.6 SAS  
ST3450856SS  
ST3300656SS  
ST3146356SS  
ST3450056SS (FDE)  
ST3300056SS (FDE)  
ST3146756SS (FDE)  
100466193  
Rev. B  
September 2008  
Contents  
1.0  
2.0  
Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Standards, compliance and reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
2.1  
2.2  
Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
2.1.1 Electromagnetic compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
2.2.1 Electromagnetic compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
2.3  
2.4  
European Union Restriction of Hazardous Substances (RoHS) . . . . . . . . . . . . . . . . . . . . . 4  
Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
3.0  
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
3.1  
3.2  
3.3  
3.4  
3.5  
3.6  
3.7  
Standard features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Media description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
Formatted capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
Programmable drive capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
Factory-installed options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
4.0  
Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
4.1  
4.2  
Internal drive characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Seek time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
4.2.1  
4.2.2  
4.2.3  
Access time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Format command execution time (minutes). . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
General performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
4.3  
4.4  
4.5  
Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Prefetch/multi-segmented cache control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
Cache operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
4.5.1  
4.5.2  
Caching write data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
Prefetch operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
5.0  
Reliability specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
5.1  
Error rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
5.1.1  
5.1.2  
5.1.3  
5.1.4  
Recoverable Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Unrecoverable Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Seek errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Interface errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
5.2  
Reliability and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
5.2.1  
5.2.2  
5.2.3  
5.2.4  
5.2.5  
5.2.6  
5.2.7  
Annualized Failrue Rate (AFR) and Mean time between failure (MTBF). . . . . . 16  
Preventive maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
Hot plugging the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
S.M.A.R.T. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
Thermal monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Drive Self Test (DST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
Product warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
6.0  
Physical/electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
6.1  
6.2  
AC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
DC power requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
6.2.1  
6.2.2  
6.2.3  
Conducted noise immunity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
Power sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
Current profiles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
6.3  
6.4  
Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
Environmental limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
6.4.1  
Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
Cheetah 15K.6 SAS Product Manual, Rev. B  
i
6.4.2  
6.4.3  
6.4.4  
6.4.5  
6.4.6  
6.4.7  
6.4.8  
Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37  
Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37  
Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37  
Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39  
Air cleanliness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39  
Corrosive environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39  
Electromagnetic susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40  
6.5  
Mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40  
7.0  
Defect and error management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43  
7.1  
7.2  
7.3  
7.4  
7.5  
7.6  
7.7  
Drive internal defects/errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43  
Drive error recovery procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43  
SAS system errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45  
Background Media Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45  
Media Pre-Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45  
Deferred Auto-Reallocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46  
Idle Read After Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46  
8.0  
9.0  
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47  
8.1  
8.2  
8.3  
8.4  
Drive orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47  
Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47  
Drive mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49  
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49  
Interface requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51  
9.1  
SAS features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51  
9.1.1  
9.1.2  
task management functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51  
task management responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51  
9.2  
9.3  
Dual port support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52  
SCSI commands supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53  
9.3.1  
9.3.2  
Inquiry data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57  
Mode Sense data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57  
9.4  
Miscellaneous operating features and conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62  
9.4.1  
9.4.2  
9.4.3  
9.4.4  
9.4.5  
9.4.6  
9.4.7  
SAS physical interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62  
Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65  
Connector requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65  
Electrical description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66  
Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66  
SAS transmitters and receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67  
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67  
9.5  
Signal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67  
9.5.1  
9.5.2  
Ready LED Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67  
Differential signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68  
10.0  
Seagate Technology support services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79  
ii  
Cheetah 15K.6 SAS Product Manual, Rev. B  
1.0  
Scope  
This manual describes Seagate Technology® LLC, Cheetah® SAS (Serial Attached SCSI) disk drives.  
Cheetah 15K.6 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.6 and  
other Seagate SAS drives.  
Model Number  
ST3450856SS  
ST3300656SS  
ST3146356SS  
ST3450056SS  
ST3300056SS  
ST3146756SS  
Full Disk Encryption (FDE)  
No  
No  
No  
Yes  
Yes  
Yes  
Cheetah 15K.6 SAS Product Manual, Rev. B  
1
   
2
Cheetah 15K.6 SAS Product Manual, Rev. B  
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 8.3.  
2.1  
Standards  
The Cheetah 15K.6 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 Cheetah 15K.6 disk drive is a UL recognized component per UL1950, CSA certified to CAN/CSA C22.2  
No. 950-95, and VDE certified to VDE 0805 and EN60950.  
The security features of Cheetah 15K.6 SAS FDE 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 12, 14 and 16, for DC power requirements.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
3
                                 
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 MIC  
If this model has the Korean Ministry of Information and Communication (MIC) logo, it complies with paragraph  
1 of Article 11 of the Electromagnetic Compatibility (EMC) Control Regulation and meets the Electromagnetic  
Compatibility Framework requirements of the Radio Research Laboratory (RRL) Ministry of Information and  
Communication Republic of Korea.  
Taiwanese BSMI  
If this model has 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.  
4
Cheetah 15K.6 SAS Product Manual, Rev. B  
     
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  
Applicable 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) Standard (T10/1562-D)  
ISO/IEC 14776-xxx SCSI Architecure Model-3 (SAM-3) 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)  
ANSI Small Computer System Interface (SCSI) Documents  
X3.270-1996(SCSI-3) Architecture Model  
Seagate part number: 30553-001  
Specification for Acoustic Test Requirement and Procedures  
Package Test Specification  
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.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
5
           
6
Cheetah 15K.6 SAS Product Manual, Rev. B  
3.0  
General description  
Cheetah 15K.6 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.6 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.6 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.6 SAS FDE models have provisions for “Security of Data at Rest” based on the standards  
defined by the Trusted Computing Group (see www.trustedcomputinggroup.org).  
Never disassemble the HDA and do not attempt to service items in the sealed enclosure (heads, media, actu-  
ator, etc.) as this requires special facilities. The drive does not contain user-replaceable parts. Opening the  
HDA for any reason voids your warranty.  
Cheetah 15K.6 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.6 SAS Product Manual, Rev. B  
7
     
3.1  
Standard features  
Cheetah 15K.6 drives have the following standard features:  
• 1.5 / 3 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.6 SAS FDE models have the following additional features:  
• Automatic data encryption/decryption on all writes and reads to and from the media  
• Cryptographic erase of user data for a drive that will be repurposed or scrapped  
• Two independent data bands which each have it’s own ownership credential and encryption key  
• 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  
• Firmware-controlled multisegmented cache designed to dynamically adjust segments for enhanced system  
performance.  
• 300 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  
Note. There is no significant performance difference between FDE and non-FDE models.  
8
Cheetah 15K.6 SAS Product Manual, Rev. B  
                           
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:  
Capacity (Blocks)  
ST3450856SS  
ST3300656SS  
ST3146356SS  
ST3450056SS (FDE)  
ST3300056SS (FDE)  
ST3146756SS (FDE)  
Sector Size  
512  
Decimal  
Hex  
Decimal  
Hex  
Decimal  
Hex  
879,097,968  
860,480,771  
836,812,167  
3465F870  
3349E503  
31E0BD87  
585,937,500  
573,653,848  
557,874,778  
22ECB25C  
22314358  
21407E5A  
286,749,488  
280,790,185  
272,662,935  
11177330  
10BC84A9  
10408197  
520  
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.6 SAS Product Manual, Rev. B  
9
                 
10  
Cheetah 15K.6 SAS Product Manual, Rev. B  
4.0  
Performance characteristics  
This section provides detailed information concerning performance-related characteristics and features of  
Cheetah 15K.6 drives.  
4.1  
Internal drive characteristics  
ST3450856SS ST3300656SS ST3146356SS  
ST3450056SS ST3300056SS ST3146756SS  
*
Drive capacity  
450  
300  
146  
Gbytes (formatted, rounded off value)  
Read/write data heads  
Tracks per inch  
8
6
3
150,000  
1,100  
165  
150,000  
1,100  
165  
150,000  
1,100  
165  
TPI  
Peak bits per inch  
Areal Density  
KBPI  
2
Gbits/inch  
Internal data rate  
disk rotation speed  
Avg rotational latency  
1.95  
15k  
1.95  
15k  
1.95  
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 9.4.1, "SAS physical interface" on page 62 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  
0.20  
6.43  
0.44  
7.12  
1.  
2.  
Typical access times are measured under nominal conditions of temperature, voltage, and  
horizontal orientation as measured on a representative sample of drives.  
Access to data = access time + latency time.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
11  
                                             
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.  
ST3450856SS  
ST3450056SS  
ST3300656SS  
ST3300056SS  
ST3146356SS  
ST3146756SS  
176  
88  
144  
72  
100  
50  
Maximum (with verify)  
Maximum (without verify)  
Note. There is no significant difference in the format time between FDE and non-FDE 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  
112 Mbytes/sec (typical)  
171 Mbytes/sec (typical)  
Maximum  
SAS Interface maximum instantaneous transfer rate  
Logical block sizes  
300 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).  
12  
Cheetah 15K.6 SAS Product Manual, Rev. B  
                 
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).  
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 9.3.2.1.  
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.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
13  
                 
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.  
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 9.3.2.1 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  
buffer to the host on subsequent Read commands that request those logical blocks (this is true even if cache  
operation is disabled). Though the prefetch operation uses the buffer as a cache, finding the requested data in  
the buffer is a prefetch hit, not a cache operation hit.  
To enable Prefetch, use Mode Select page 08h, byte 12, bit 5 (Disable Read Ahead - DRA bit). DRA bit = 0  
enables prefetch.  
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.  
14  
Cheetah 15K.6 SAS Product Manual, Rev. B  
     
5.0  
Reliability specifications  
The following reliability specifications assume correct host and drive operational interface, including all inter-  
face timings, power supply voltages, environmental requirements and drive mounting constraints.  
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.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
15  
                                 
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 8.2 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.  
16  
Cheetah 15K.6 SAS Product Manual, Rev. B  
                     
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  
Cheetah 15K.6 SAS Product Manual, Rev. B  
17  
   
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.6 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 11)  
18  
Cheetah 15K.6 SAS Product Manual, Rev. B  
 
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 11:  
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.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
19  
   
A Drive Not Ready condition is reported by the drive under the following conditions:  
• Motor will not spin  
• Motor will not lock to speed  
• Servo will not lock on track  
• Drive cannot read configuration tables from the 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.  
20  
Cheetah 15K.6 SAS Product Manual, Rev. B  
The drive will report the failure condition and LBA (if applicable) in the Self-test Results Log parameter. The  
Sense key, ASC, ASCQ, and FRU are used to report the failure condition.  
5.2.6.2.5  
Abort  
There are several ways to abort a diagnostic. You can use a SCSI Bus Reset or a Bus Device Reset message  
to abort the diagnostic.  
You can abort a DST executing in background mode by using the abort code in the DST Function Code field.  
This will cause a 01 (self-test aborted by the application client) code to appear in the self-test results values  
log. All other abort mechanisms will be reported as a 02 (self-test routine was interrupted by a reset condition).  
5.2.7  
Product warranty  
Beginning on the date of shipment to the customer and continuing for the period specified in your purchase  
contract, Seagate warrants that each product (including components and subassemblies) that fails to function  
properly under normal use due to defect in materials or workmanship or due to nonconformance to the applica-  
ble specifications will be repaired or replaced, at Seagate’s option and at no charge to the customer, if returned  
by customer at customer’s expense to Seagate’s designated facility in accordance with Seagate’s warranty  
procedure. Seagate will pay for transporting the repair or replacement item to the customer. For more detailed  
warranty information, refer to the standard terms and conditions of purchase for Seagate products on your pur-  
chase documentation.  
The remaining warranty for a particular drive can be determined by calling Seagate Customer Service at  
1-800-468-3472. You can also determine remaining warranty using the Seagate web site (www.seagate.com).  
The drive serial number is required to determine remaining warranty information.  
Shipping  
When transporting or shipping a drive, use only a Seagate-approved container. Keep your original box.  
Seagate approved containers are easily identified by the Seagate Approved Package label. Shipping a drive in  
a non-approved container voids the drive warranty.  
Seagate repair centers may refuse receipt of components improperly packaged or obviously damaged in tran-  
sit. Contact your authorized Seagate distributor to purchase additional boxes. Seagate recommends shipping  
by an air-ride carrier experienced in handling computer equipment.  
Product repair and return information  
Seagate customer service centers are the only facilities authorized to service Seagate drives. Seagate does  
not sanction any third-party repair facilities. Any unauthorized repair or tampering with the factory seal voids  
the warranty.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
21  
             
22  
Cheetah 15K.6 SAS Product Manual, Rev. B  
6.0  
Physical/electrical specifications  
This section provides information relating to the physical and electrical characteristics of the drive.  
6.1  
AC power requirements  
None.  
6.2  
DC power requirements  
The voltage and current requirements for a single drive are shown below. Values indicated apply at the drive  
connector.  
Table 12:  
ST3450856SS DC power requirements  
ST3450856SS  
ST3450856SS  
3 Gbit mode  
1.5 Gbit mode  
(Amps)  
+5V  
Notes  
(Amps)  
+12V [2]  
±5% [2]  
0.75  
(Amps)  
+5V  
(Amps)  
+12V [2]  
±5% [2]  
0.75  
Voltage  
Regulation  
[5]  
±5%  
±5%  
Avg idle current DCX  
Maximum starting current  
(peak DC) DC  
(peak AC) AC  
[1] [7]  
0.55  
0.57  
3σ  
[3]  
0.91  
1.13  
0.60  
1.93  
4.18  
0.04  
0.76  
0.87  
0.63  
1.93  
4.36  
0.04  
3σ  
[3]  
Delayed motor start (max) DC 3σ  
[1] [4]  
Peak operating current:  
Typical DCX  
[1][6]  
[1]  
[1]  
0.62  
0.64  
1.16  
1.19  
1.21  
2.70  
0.64  
0.67  
1.14  
1.19  
1.21  
2.74  
Maximum DC  
3σ  
Maximum (peak) DC  
3σ  
Cheetah 15K.6 SAS Product Manual, Rev. B  
23  
                         
Table 13:  
ST3450056SS (FDE) DC power requirements  
ST3450056SS (FDE)  
ST3450056SS (FDE)  
3 Gbit mode  
1.5 Gbit mode  
(Amps)  
+5V  
Notes  
(Amps)  
+12V [2]  
±5% [2]  
0.77  
(Amps)  
+5V  
(Amps)  
Voltage  
+12V [2]  
±5% [2]  
0.77  
Regulation  
[5]  
±5%  
±5%  
Avg idle current DCX  
Maximum starting current  
(peak DC) DC  
(peak AC) AC  
[1] [7]  
0.45  
0.48  
3σ  
[3]  
0.67  
0.97  
0.60  
1.96  
4.57  
0.04  
0.74  
0.84  
0.63  
1.96  
4.40  
0.04  
3σ  
[3]  
Delayed motor start (max) DC 3σ  
[1] [4]  
Peak operating current:  
Typical DCX  
[1][6]  
[1]  
[1]  
0.57  
0.62  
1.14  
1.21  
1.23  
2.70  
0.59  
0.64  
1.16  
1.21  
1.24  
2.72  
Maximum DC  
3σ  
Maximum (peak) DC  
3σ  
Table 14:  
ST3300656SS DC power requirements  
ST3300656SS  
ST3300656SS  
3 Gbit mode  
1.5 Gbit mode  
(Amps)  
+5V  
Notes  
(Amps)  
+12V [2]  
±5% [2]  
0.64  
(Amps)  
+5V  
(Amps)  
+12V [2]  
±5% [2]  
0.63  
Voltage  
Regulation  
[5]  
±5%  
±5%  
Avg idle current DCX  
Maximum starting current  
(peak DC) DC  
(peak AC) AC  
[1] [7]  
0.51  
0.54  
3σ  
[3]  
0.73  
0.91  
0.60  
1.76  
4.08  
0.04  
0.90  
1.07  
0.63  
1.76  
3.96  
0.04  
3σ  
[3]  
Delayed motor start (max) DC 3σ  
Peak operating current:  
Typical DCX  
[1] [4]  
[1][6]  
[1]  
0.58  
0.64  
1.14  
1.06  
1.07  
2.48  
0.60  
0.65  
1.16  
1.06  
1.08  
2.44  
Maximum DC  
3σ  
Maximum (peak) DC  
3σ  
24  
Cheetah 15K.6 SAS Product Manual, Rev. B  
       
Table 15:  
ST3300056SS (FDE) DC power requirements  
ST3300056SS (FDE)  
ST3300056SS (FDE)  
3 Gbit mode  
1.5 Gbit mode  
(Amps)  
+5V  
Notes  
(Amps)  
+12V [2]  
±5% [2]  
0.66  
(Amps)  
+5V  
(Amps)  
Voltage  
+12V [2]  
±5% [2]  
0.66  
Regulation  
[5]  
±5%  
±5%  
Avg idle current DCX  
Maximum starting current  
(peak DC) DC  
(peak AC) AC  
[1] [7]  
0.48  
0.50  
3σ  
[3]  
0.67  
0.82  
0.60  
1.78  
4.02  
0.04  
0.69  
0.88  
0.63  
1.78  
4.06  
0.04  
3σ  
[3]  
Delayed motor start (max) DC 3σ  
Peak operating current:  
Typical DCX  
[1] [4]  
[1][6]  
[1]  
0.59  
0.60  
1.14  
1.09  
1.13  
2.60  
0.62  
0.62  
1.14  
1.09  
1.12  
2.60  
Maximum DC  
3σ  
Maximum (peak) DC  
3σ  
Table 16:  
ST3146356SS DC power requirements  
ST3146356SS  
ST3146356SS  
3 Gbit mode  
1.5 Gbit mode  
(Amps)  
+5V  
Notes  
(Amps)  
+12V [2]  
±5% [2]  
0.53  
(Amps)  
+5V  
(Amps)  
+12V [2]  
±5% [2]  
0.53  
Voltage  
Regulation  
[5]  
±5%  
±5%  
Avg idle current DCX  
Maximum starting current  
(peak DC) DC  
(peak AC) AC  
[1] [7]  
0.52  
0.54  
3σ  
[3]  
0.89  
1.15  
0.60  
1.74  
3.88  
0.04  
0.68  
0.88  
0.63  
1.74  
3.82  
0.04  
3σ  
[3]  
Delayed motor start (max) DC 3σ  
Peak operating current:  
Typical DCX  
[1] [4]  
[1][6]  
[1]  
0.58  
0.61  
1.12  
0.95  
0.96  
2.38  
0.61  
0.64  
1.16  
0.95  
0.96  
2.38  
Maximum DC  
3σ  
Maximum (peak) DC  
3σ  
Cheetah 15K.6 SAS Product Manual, Rev. B  
25  
       
Table 17:  
ST3146756SS (FDE) DC power requirements  
ST3146756SS (FDE)  
ST3146756SS (FDE)  
3 Gbit mode  
1.5 Gbit mode  
(Amps)  
+5V  
Notes  
(Amps)  
+12V [2]  
±5% [2]  
0.55  
(Amps)  
+5V  
(Amps)  
Voltage  
+12V [2]  
±5% [2]  
0.55  
Regulation  
[5]  
±5%  
±5%  
Avg idle current DCX  
Maximum starting current  
(peak DC) DC  
(peak AC) AC  
[1] [7]  
0.49  
0.51  
3σ  
[3]  
0.66  
0.86  
0.60  
1.81  
4.24  
0.04  
0.69  
0.90  
0.63  
1.82  
4.28  
0.04  
3σ  
[3]  
Delayed motor start (max) DC 3σ  
Peak operating current:  
Typical DCX  
[1] [4]  
[1][6]  
[1]  
0.58  
0.59  
1.12  
0.96  
0.97  
2.32  
0.60  
0.62  
1.14  
0.96  
0.97  
2.36  
Maximum DC  
3σ  
Maximum (peak) DC  
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.  
[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 330 I/Os per second for 450GB models, and  
347 I/Os per second for 300GB and 1465GB 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.  
26  
Cheetah 15K.6 SAS Product Manual, Rev. B  
       
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 12, 14, and 16 for maximum current requirements.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
27  
             
Figure 1.  
Typical 450GB current profiles  
Figure 2.  
Typical 300GB current profiles  
28  
Cheetah 15K.6 SAS Product Manual, Rev. B  
 
Figure 3.  
Typical 146GB current profiles  
Cheetah 15K.6 SAS Product Manual, Rev. B  
29  
6.3  
Power dissipation  
ST3450856SS model  
Typical power dissipation under idle conditions in 3Gb operation is 11.85 watts (40.44 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.  
ST3450856SS, 3 Gbit, DC current and power vs. input/output operations per second  
30  
Cheetah 15K.6 SAS Product Manual, Rev. B  
     
ST3450056SS (FDE) model  
Typical power dissipation under idle conditions in 3Gb operation is 11.64 watts (39.72 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 5.  
ST3450056SS (FDE), 3 Gbit, DC current and power vs. input/output operations per second  
Cheetah 15K.6 SAS Product Manual, Rev. B  
31  
ST3300656SS model  
Typical power dissipation under idle conditions in 3Gb operation is 10.26 watts (35.01 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.  
ST3300656SS, 3 Gbit, DC current and power vs. input/output operations per second  
32  
Cheetah 15K.6 SAS Product Manual, Rev. B  
ST3300056SS (FDE) model  
Typical power dissipation under idle conditions in 3Gb operation is 10.42 watts (35.56 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 7.  
ST3300056SS (FDE), 3 Gbit, DC current and power vs. input/output operations per second  
Cheetah 15K.6 SAS Product Manual, Rev. B  
33  
ST3146356SS model  
Typical power dissipation under idle conditions in 3Gb operation is 9.06 watts (30.92 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 8.  
ST3146356SS, 3 Gbit, DC current and power vs. input/output operations per second  
34  
Cheetah 15K.6 SAS Product Manual, Rev. B  
ST3146756SS (FDE) model in 3 Gbit operation  
Typical power dissipation under idle conditions in 3Gb operation is 9.15 watts (31.22 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 9.  
ST3146756SS (FDE), 3 Gbit, DC current and power vs. input/output operations per second  
Cheetah 15K.6 SAS Product Manual, Rev. B  
35  
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 36°F (20°C) per  
hour. Air flow may be needed in the drive enclosure to keep within this range (see Section 8.3). Operation  
at HDA case temperatures outside this range may adversely affect the drives ability to meet specifications.  
To confirm that the required cooling for the electronics and HDA case is provided, place the drive in its final  
mechanical configuration, perform random write/read operations and measure the HDA case temperature  
after it has stabilized.  
b. Non-operating  
–40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This  
specification assumes that the drive is packaged in the shipping container designed by Seagate for use with  
drive.  
HDA Temp.  
1.0"  
Check Point  
.5"  
Figure 10. Location of the HDA temperature check point  
36  
Cheetah 15K.6 SAS Product Manual, Rev. B  
                   
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 11, and in accordance with the restrictions of Section 8.3.  
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)  
• 25 Gs at a duration of 2 msec (half sinewave)  
• 60 Gs at a duration of 2 msec (half sinewave) when performing reads only  
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.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
37  
                         
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.  
Z
X
Y
X
Z
Y
Figure 11. Recommended mounting  
38  
Cheetah 15K.6 SAS Product Manual, Rev. B  
       
6.4.4.2  
Vibration  
a. Operating—normal  
The drive as installed for normal operation, shall comply with the complete specified performance while  
subjected to continuous vibration not exceeding  
10–500 Hz @ 0.5 G (zero to peak)  
Vibration may be applied in the X, Y, or Z axis.  
Operating normal translational random flat profile  
10–500 Hz  
0.4 gRMS  
b. Operating—abnormal  
Equipment as installed for normal operation shall not incur physical damage while subjected to periodic  
vibration not exceeding:  
15 minutes of duration at major resonant frequency  
10–500 Hz @ 0.75 G (X, Y, or Z axis)  
Vibration occurring at these levels may degrade operational performance during the abnormal vibration  
period. Specified operational performance will continue when normal operating vibration levels are  
resumed. This assumes system recovery routines are available.  
Operating abnormal translational random flat profile  
10–500 Hz  
1.2 gRMS  
c. Non-operating  
The limits of non-operating vibration shall apply to all conditions of handling and transportation. This  
includes both isolated drives and integrated drives.  
The drive shall not incur physical damage or degraded performance as a result of continuous vibration not  
exceeding  
5–500 Hz @ 3G  
Amplitudes above 1.0 G in the frequency range of 5–22 Hz may be limited due to shaker  
equipment stroke limitations.  
Vibration may be applied in the X, Y, or Z axis.  
Non-operating translational random flat profile  
10–500 Hz  
1.2 gRMS  
6.4.5  
Acoustics  
Sound power during idle mode shall be 3.5 bels typical when measured to ISO 7779 specification. Sound  
power while operating shall be 3.7 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.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
39  
                             
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  
Electromagnetic susceptibility  
See Section 2.1.1.1.  
6.5  
Mechanical specifications  
Refer to Figure 12 for detailed physical dimensions. See Section 8.3, “Drive mounting.”  
Height:  
Width:  
Depth:  
1.028 in  
4.010 in  
5.787 in  
26.11 mm  
101.85 mm  
146.99 mm  
Weight:  
ST3450856SS: 1.563 pounds 0.709 kilograms  
ST3450056SS  
ST3300656SS: 1.53 pounds  
ST3300056SS  
0.694 kilograms  
ST3146356SS: 1.487 pounds 0.674 kilograms  
ST3146756SS  
40  
Cheetah 15K.6 SAS Product Manual, Rev. B  
               
26.11 MAX  
2X 20.14  
(2X .793)  
(1.028 MAX)  
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 12. Physical dimensions  
Cheetah 15K.6 SAS Product Manual, Rev. B  
41  
 
42  
Cheetah 15K.6 SAS Product Manual, Rev. B  
7.0  
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 7.4)  
• Media Pre-Scan (see Section 7.5)  
• Deferred Auto-Reallocation (see Section 7.6)  
• Idle Read After Write (see Section 7.7)  
The read error rates and specified storage capacities are not dependent on host (initiator) defect management  
routines.  
7.1  
Drive internal defects/errors  
During the initial drive format operation at the factory, media defects are identified, tagged as being unusable,  
and their locations recorded on the drive primary defects list (referred to as the “P’ list and also as the ETF  
defect list). At factory format time, these known defects are also reallocated, that is, reassigned to a new place  
on the medium and the location listed in the defects reallocation table. The “P” list is not altered after factory  
formatting. Locations of defects found and reallocated during error recovery procedures after drive shipment  
are listed in the “G” list (defects growth list). The “P” and “G” lists may be referenced by the initiator using the  
Read Defect Data command.  
Details of the SCSI commands supported by the drive are described in the SAS Interface Manual. Also, more  
information on the drive Error Recovery philosophy is presented in the SAS Interface Manual.  
7.2  
Drive error recovery procedures  
When an error occurs during drive operation, the drive, if programmed to do so, performs error recovery proce-  
dures to attempt to recover the data. The error recovery procedures used depend on the options previously set  
in the Error Recovery Parameters mode page. Error recovery and defect management may involve using sev-  
eral SCSI commands described in the 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.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
43  
                 
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.  
Table 18 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.  
Table 18:  
Read and write retry count maximum recovery times  
Maximum recovery time per  
Maximum recovery time per  
LBA (cumulative, msec)  
Read retry count1 LBA (cumulative, msec)  
Write retry count1  
0
51.87  
0
23.94  
35.91  
55.86  
67.83  
119.79  
147.72  
1
59.85  
1
2
203.49  
219.45  
231.42  
297.38  
323.62  
355.54  
439.39  
507.39  
539.31  
567.24  
1,460.85  
1,468.74  
2
3
3
4
4
5
5 (default)  
6
7
8
9
10  
11  
12  
13 (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.  
44  
Cheetah 15K.6 SAS Product Manual, Rev. B  
 
7.3  
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.  
7.4  
Background Media Scan  
Background Media Scan (BMS) is a self-initiated media scan. BMS is defined in the T10 document SPC-4  
available from the T10 committee. BMS performs sequential reads across the entire pack of the media while  
the drive is idle. In RAID arrays, BMS allows hot spare drives to be scanned for defects prior to being put into  
service by the host system. On regular duty drives, if the host system makes use of the BMS Log Page, it can  
avoid placing data in suspect locations on the media. Unreadable and recovered error sites will be logged or  
reallocated per ARRE/AWRE settings.  
With BMS, the host system can consume less power and system overhead by only checking BMS status and  
results rather than tying up the bus and consuming power in the process of host-initiated media scanning activ-  
ity.  
Since the background scan functions are only done during idle periods, BMS causes a negligible impact to sys-  
tem performance. The first BMS scan for a newly manufactured drive is performed as quickly as possible to  
verify the media and protect data by setting the “Start time after idle” to 5ms, all subsequent scans begin after  
500ms of idle time. Other features that normally use idle time to function will function normally because BMS  
functions for bursts of 800ms and then suspends activity for 100ms to allow other background functions to  
operate.  
BMS interrupts immediately to service host commands from the interface bus while performing reads. BMS will  
complete any BMS-initiated error recovery prior to returning to service host-initiated commands. Overhead  
associated with a return to host-servicing activity from BMS only impacts the first command that interrupted  
BMS, this results in a typical delay of about 1 ms.  
7.5  
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.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
45  
           
7.6  
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.  
7.7  
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.  
46  
Cheetah 15K.6 SAS Product Manual, Rev. B  
           
8.0  
Installation  
Cheetah 15K.6 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 9.4.1 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.  
8.1  
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.  
8.2  
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.6 SAS Product Manual, Rev. B  
47  
                                   
If forced air is determined to be necessary, possible air-flow patterns are shown in Figure 13. 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 13. Air flow  
48  
Cheetah 15K.6 SAS Product Manual, Rev. B  
     
8.3  
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.  
8.4  
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.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
49  
                         
50  
Cheetah 15K.6 SAS Product Manual, Rev. B  
9.0  
Interface requirements  
This section partially describes the interface requirements as implemented on Cheetah 15K.6 drives. Addi-  
tional information is provided in the SAS Interface Manual (part number 100293071).  
9.1  
SAS features  
This section lists the SAS-specific features supported by Cheetah 15K.6 drives.  
9.1.1  
task management functions  
Table 19 lists the SAS task management functions supported.  
Table 19:  
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  
9.1.2  
task management responses  
Table 20 lists the SAS response codes returned for task management functions supported.  
Table 20:  
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.6 SAS Product Manual, Rev. B  
51  
                                 
9.2  
Dual port support  
Cheetah 15K.6 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 run at the same link rate. The first port to successfully complete speed negotiation sets the link  
rate support by both ports. When the second port participates in speed negotiation, it indicates the only sup-  
ported speed is the speed selected by the first port. If the first port to complete speed negotiation looses sync  
before the second port completes speed negotiation, both ports revert back to the power on condition of allow-  
ing either link rate (1.5 or 3.0 Gbits/sec).  
Subject to buffer availability, the Cheetah 15K.6 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.  
52  
Cheetah 15K.6 SAS Product Manual, Rev. B  
   
9.3  
SCSI commands supported  
Table 21 lists the SCSI commands supported by Cheetah 15K.6 drives.  
Table 21: Commands supported by Cheetah 15K.6 SAS family drives  
Command name  
Command code  
Supported  
Change Definition  
40h  
39h  
18h  
3Ah  
04h  
N
Compare  
N
N
N
Y
N
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
Y
N
Y
Y
N
N
N
Y
Y
N
Y
Y
N
N
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  
TSD bit  
ETC bit  
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)  
Last n Deferred Errors or Asynchronous Events page (0Bh)  
Last n Error Events page (07h)  
Cheetah 15K.6 SAS Product Manual, Rev. B  
53  
   
Table 21:  
Commands supported by Cheetah 15K.6 SAS family drives (continued)  
Command name  
Command code  
Supported  
Non-medium Error page (06h)  
Pages Supported list (00h)  
Y
Y
Read Error Counter page (03h)  
Read Reverse Error Counter page (04h)  
Self-test Results page (10h)  
Y
N
Y
Background Medium Scan page (15h)  
Start-stop Cycle Counter page (0Eh)  
Temperature page (0Dh)  
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)  
Y
Y
Format page (03h)  
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
Mode Sense (10) (same pages as Mode Sense 1Ah)  
5Ah  
34h  
08h  
3Ch  
25h  
37h  
B7h  
28h  
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Prefetch  
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  
54  
Cheetah 15K.6 SAS Product Manual, Rev. B  
Table 21:  
Commands supported by Cheetah 15K.6 SAS family drives (continued)  
Command name  
Command code  
Supported  
Reassign Blocks  
Receive Diagnostic Results  
Supported Diagnostics pages (00h)  
Translate page (40h)  
Release  
07h  
1Ch  
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
Y
Y
Y
Y
Y
Y
Y
Y
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  
00h  
2Fh  
Start Unit/Stop Unit (spindle ceases rotating)  
Synchronize Cache  
Test Unit Ready  
Verify  
BYTCHK bit  
Write  
0Ah  
2Eh  
Write and Verify  
DPO bit  
Write Buffer (modes 0, 2, supported)  
3Bh  
2Ah  
Firmware Download option  
(modes 5, 7, Ah and Bh supported) [3]  
Write Extended  
DPO bit  
Y
Y
Cheetah 15K.6 SAS Product Manual, Rev. B  
55  
Table 21:  
Commands supported by Cheetah 15K.6 SAS family drives (continued)  
Command name  
FUA bit  
Command code  
Supported  
Y
Write Long  
Write Same  
PBdata  
3Fh  
41h  
Y
Y
N
N
N
N
N
LBdata  
XDRead  
52h  
50h  
51h  
XDWrite  
XPWrite  
[1] Cheetah 15K.6 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.  
56  
Cheetah 15K.6 SAS Product Manual, Rev. B  
   
9.3.1  
Inquiry data  
Table 22 lists the Inquiry command data that the drive should return to the initiator per the format given in the  
SAS Interface Manual.  
Table 22:  
Inquiry data  
Data (hex)  
Bytes  
0-15  
00  
[53  
R#  
00  
00  
00  
00  
00  
54  
R#  
00  
00  
00  
43  
xx** 12  
8B  
35  
S#  
00  
00  
00  
79  
53  
74  
00  
30  
S#  
00  
00  
00  
72  
65  
73  
10  
38  
S#  
00  
00  
00  
69  
61  
20  
0A  
35  
S#  
00  
00  
00  
67  
67  
72  
53  
36  
S#  
00  
00  
00  
68  
61  
65  
45  
53  
S#  
00  
00  
00  
74  
74  
73  
41  
47  
20  
S#  
00  
00  
00  
28  
20  
72  
41  
20  
00  
00  
00  
00  
63  
41  
76  
54  
20  
00  
00  
00  
00  
29  
6C  
65  
45  
20  
00  
00  
00  
00  
20  
6C  
64  
20  
20  
00  
00  
00  
00  
Vendor ID  
Product ID  
1
16-31  
32-47  
48-63  
64-79  
80-95  
96-111  
112-127  
128-143  
33  
R#  
00  
00  
00  
6F  
34  
R#  
00  
00  
00  
70  
20  
68  
53]  
S#  
00  
00  
00  
20  
65  
65  
32* *Copyright  
30* 30* 37*  
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 ST3450856SS.  
Refer to the values below for the values of bytes 18 through 27 of you particular model:  
ST3450856SS  
53 54 33 34 35 30 38 35 36 53 53  
53 54 33 34 35 30 30 35 36 53 53  
53 54 33 33 30 30 36 35 36 53 53  
53 54 33 33 30 30 30 35 36 53 53  
53 54 33 31 34 36 33 35 56 53 53  
53 54 33 31 34 36 37 35 56 53 53  
ST3450056SS (FDE)  
ST3300656SS  
ST3300056SS (FDE)  
ST3146356SS  
ST3146756SS (FDE)  
Cheetah 15K.6 SAS Product Manual, Rev. B  
57  
     
9.3.2  
Mode Sense data  
The Mode Sense command provides a way for the drive to report its operating parameters to the initiator. The  
drive maintains four sets of mode parameters:  
1. Default values  
Default values are hard-coded in the drive firmware stored in flash E-PROM (nonvolatile memory) on the  
drive’s PCB. These default values can be changed only by downloading a complete set of new firmware  
into the flash E-PROM. An initiator can request and receive from the drive a list of default values and use  
those in a Mode Select command to set up new current and saved values, where the values are change-  
able.  
2. Saved values  
Saved values are stored on the drive’s media using a Mode Select command. Only parameter values that  
are allowed to be changed can be changed by this method. Parameters in the saved values list that are not  
changeable by the Mode Select command get their values from default values storage.  
When power is applied to the drive, it takes saved values from the media and stores them as current val-  
ues in volatile memory. It is not possible to change the current values (or the saved values) with a Mode  
Select command before the drive achieves operating speed and is “ready.” An attempt to do so results in a  
“Check Condition” status.  
On drives requiring unique saved values, the required unique saved values are stored into the saved val-  
ues storage location on the media prior to shipping the drive. Some drives may have unique firmware with  
unique default values also.  
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 9.3.2.1, 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.  
58  
Cheetah 15K.6 SAS Product Manual, Rev. B  
   
9.3.2.1  
ST3450856SS/ST3450056SS Mode Sense data  
MODE DATA HEADER:  
01 2e 00 10 00 00 00 08  
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 01 09 00 5f 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 02 57 08 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 0e c4  
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 9a 0a 00 02 00 00 00 05 00 00 00 04  
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00  
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 80 06 00 80 0f 00 00 00  
CHG 80 06 b7 c0 0f 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: 34 65 F8 6F 00 00 02 00 __ __ __ __ __ __ __ __ 4e.o....  
Cheetah 15K.6 SAS Product Manual, Rev. B  
59  
 
9.3.2.2  
ST3300656SS/ST3300056SS Mode Sense data  
MODE DATA HEADER:  
01 2e 00 10 00 00 00 08  
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 01 09 00 5f 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 02 57 08 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 09 9c  
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 9a 0a 00 02 00 00 00 05 00 00 00 04  
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00  
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 80 06 00 80 0f 00 00 00  
CHG 80 06 b7 c0 0f 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: 22 EC B2 5B 00 00 02 00 __ __ __ __ __ __ __ __ "..[....  
60  
Cheetah 15K.6 SAS Product Manual, Rev. B  
9.3.2.3  
ST3146356SS/ST3146756SS Mode Sense data  
MODE DATA HEADER:  
01 2e 00 10 00 00 00 08  
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 01 09 00 5f 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 02 57 08 03 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 06 cc  
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 9a 0a 00 02 00 00 00 05 00 00 00 04  
CHG 9a 0a 00 03 ff ff ff ff 00 00 00 00  
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 80 06 00 80 0f 00 00 00  
CHG 80 06 b7 c0 0f 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: 11 17 73 2F 00 00 02 00 __ __ __ __ __ __ __ __ ..s/....  
Cheetah 15K.6 SAS Product Manual, Rev. B  
61  
9.4  
Miscellaneous operating features and conditions  
Table 23 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 23:  
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 24:  
Miscellaneous status  
Supported  
Status  
Y
Y
Y
Y
Y
Y
Y
Y
N
N
Good  
Check condition  
Condition met/good  
Busy  
Intermediate/good  
Intermediate/condition met/good  
Reservation conflict  
Task set full  
ACA active  
ACA active, faulted initiator  
9.4.1  
SAS physical interface  
Figure 14 shows the location of the SAS device connector J1. Figures 15 and 16 provide the dimensions of the  
SAS device.  
62  
Cheetah 15K.6 SAS Product Manual, Rev. B  
                                                 
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 14.  
Physical interface  
Cheetah 15K.6 SAS Product Manual, Rev. B  
63  
   
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 15. SAS connector dimensions  
64  
Cheetah 15K.6 SAS Product Manual, Rev. B  
 
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 16. SAS connector dimensions  
9.4.2  
Physical characteristics  
This section defines physical interface connector.  
9.4.3  
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 15 and 16.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
65  
         
9.4.4  
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.  
9.4.5  
Pin descriptions  
This section provides a pin-out of the SAS device and a description of the functions provided by the pins.  
Table 25:  
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.  
66  
Cheetah 15K.6 SAS Product Manual, Rev. B  
                   
9.4.6  
SAS transmitters and receivers  
A typical SAS differential copper transmitter and receiver pair is shown in Figure 17. 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 17. SAS transmitters and receivers  
9.4.7  
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.  
9.5  
Signal characteristics  
This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 25  
for signal type and signal name information.  
9.5.1  
Ready LED Out  
The Ready LED Out signal is driven by the drive as indicated in Table 26.  
Table 26:  
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  
Cheetah 15K.6 SAS Product Manual, Rev. B  
67  
                               
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 27 for the output characteristics of the LED drive signals.  
Table 27:  
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  
9.5.2  
Differential signals  
The drive SAS differential signals comply with the intra-enclosure (internal connector) requirements of the SAS  
standard.  
Table 28 defines the general interface characteristics.  
Table 28:  
General interface characteristics  
Characteristic  
Units  
Mbaud  
ps  
1.5 Gbps  
1,500  
666.6  
100  
3.0 Gbps  
3,000  
333.3  
100  
Bit rate (nominal)  
Unit interval (UI)(nominal)  
Impedance (nominal, differential )  
Transmitter transients, maximum  
Receiver transients, maximum  
ohm  
V
1.2  
1.2  
V
1.2  
1.2  
9.5.2.1  
Eye masks  
9.5.2.1.1  
Eye masks overview  
The eye masks are graphical representations of the voltage and time limits on the signal at the compliance  
-12  
point. The time values between X1 and (1 - X1) cover all but 10 of the jitter population. The random content  
of the total jitter population has a range of 7 standard deviations.  
68  
Cheetah 15K.6 SAS Product Manual, Rev. B  
     
9.5.2.1.2  
Receive eye mask  
Figure 18 describes the receive eye mask. This eye mask applies to jitter after the application of a single pole  
high-pass frequency-weighting function that progressively attenuates jitter at 20 dB/decade below a frequency  
of ((bit rate) / 1.667).  
Absolute  
amplitude  
(in V)  
Z2  
Z1  
0 V  
-Z1  
-Z2  
0
X1  
X2 1-X1  
1-X2  
1
Normalized time (in UI)  
Figure 18. Receive eye mask  
Verifying compliance with the limits represented by the receive eye mask should be done with reverse channel  
traffic present in order that the effects of crosstalk are taken into account.  
9.5.2.1.3  
Jitter tolerance masks  
Figure 19 describes the receive tolerance eye masks and is constructed using the X2 and Z2 values given in  
table 31. X1 is half the value for total jitter intable 31 and X1  
is half the value for total jitter in table 32, for  
OP  
TOL  
jitter frequencies above ((bit rate) / 1.667).  
Absolute  
amplitude  
(additional sinusoidal jitter) / 2  
(in V)  
Z2  
Z1OP  
Z1TOL  
Outline of eye mask  
before adding  
0 V  
-Z1  
sinusoidal jitter  
TOL  
-Z1OP  
Outline of eye mask  
after adding  
-Z2  
sinusoidal jitter  
0
X1OP  
X2  
1
1-X1  
OP  
X1TOL  
1-X1  
TOL  
Normalized time (in UI)  
Figure 19. Receive tolerance eye mask  
Cheetah 15K.6 SAS Product Manual, Rev. B  
69  
   
The leading and trailing edge slopes of figure 18 shall be preserved. As a result the amplitude value of Z1 is  
less than that given in table 30 and Z1  
tion:  
and Z1 shall be defined from those slopes by the following equa-  
TOL  
OP  
X2 – ((0, 5)xadditional sinusoidal jitter) – X1OP  
Z1TOL = Z1OPx---------O---P----------------------------------------------------------------------------------------------------------------------  
X2OP – X1OP  
where:  
Z1  
is the value for Z1 to be used for the tolerance masks; and  
TOL  
Z1 , X1 , and X2 are the values in table 30 for Z1, X1, and X2.  
OP  
OP  
OP  
The X1 points in the receive tolerance masks are greater than the X1 points in the receive masks, due to the  
addition of sinusoidal jitter.  
Figure 20 defines the sinusoidal jitter mask.  
Peak-to-  
peak  
Sinusoidal jitter frequency  
sinusoidal  
(log/log plot)  
jitter  
(in UI)  
FNOM = 1.5 x 10 9 for 1.5 Gbps  
FNOM = 3.0 x 10 9 for 3.0 Gbps  
1.5  
1.0  
0.1  
0
FNOM / 25,000  
FNOM / 1,667  
Frequency (in kHz)  
Figure 20. Sinusoidal jitter mask  
70  
Cheetah 15K.6 SAS Product Manual, Rev. B  
 
9.5.2.2  
Transmitter signal characteristics  
Table 29 specifies the signal requirements at the transmitter end of a TxRx connection as measured into the  
zero-length test load. All specifications are based on differential measurements.  
The OOB sequence is performed at signal voltage levels corresponding to the lowest supported transfer rate.  
Table 29 specifies the signal characteristics.  
Table 29:  
Transmitter signal characteristics  
Signal characteristica  
Units  
ps  
1.5 Gbps  
20  
3.0 Gbps  
15  
b
Skew  
c
Tx Off Voltage  
mV(P-P)  
ps  
< 50  
273  
67  
< 50  
137  
67  
d
Maximum rise/fall time  
d
Minimum rise/fall time  
ps  
e
Maximum transmitter output imbalance  
%
10  
10  
f
OOB offset delta  
mV  
25  
25  
g
OOB common mode delta  
mV  
50  
50  
a All tests in this table shall be performed with zero-length test load shown in figure 22.  
b The skew measurement shall be made at the midpoint of the transition with a repeating 0101b pattern on the physical  
link. The same stable trigger, coherent to the data stream, shall be used for both the Tx+ and Tx- signals. Skew is  
defined as the time difference between the means of the midpoint crossing times of the Tx+ signal and the Tx- signal.  
c The transmitter off voltage is the maximum A.C. voltage measured at compliance points when the transmitter is  
unpowered or transmitting D.C. idle (e.g., during idle time of an OOB signal).  
d Rise/fall times are measured from 20 % to 80 % of the transition with a repeating 0101b pattern on the physical link.  
e The maximum difference between the V+ and V- A.C. RMS transmitter amplitudes measured on a CJTPAT test  
pattern (see 9.5.2.3.3) into the test load shown in figure 22, as a percentage of the average of the V+ and V- A.C.  
RMS amplitudes.  
f
The maximum difference in the average differential voltage (D.C. offset) component between the burst times and the  
idle times of an OOB signal.  
g The maximum difference in the average of the common mode voltage between the burst times and the idle times of  
an OOB signal.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
71  
 
9.5.2.3  
Receiver signal characteristics  
Table 30 defines the compliance point requirements of the signal at the receiver end of a TxRx connection as  
measured into the test loads specified in figure 21 and figure 22.  
Table 30: Receiver signal characteristics  
Signal characteristic  
Units  
1.5 Gbps  
3.0 Gbps  
b
Jitter (see figure 18)  
2 x Z2  
N/A  
See table 31 See table 31  
mV(P-P)  
mV(P-P)  
UI  
1,200  
325  
1,600  
275  
2 x Z1  
a
X1  
0.275  
0.50  
80  
0.275  
0.50  
75  
X2  
UI  
d
Skew  
ps  
Max voltage (non-op)  
mV(P-P)  
mV(P-P)  
mV(P-P)  
mV(P-P)  
2.000  
240  
2.000  
240  
c
Minimum OOB ALIGN burst amplitude  
c
Maximum noise during OOB idle time  
120  
120  
e
Max near-end crosstalk  
100  
100  
a The value for X1 shall be half the value given for total jitter in table 31. The test or analysis shall include the effects of  
a single pole high-pass frequency-weighting function that progressively attenuates jitter at 20 dB/decade below a  
frequency of ((bit rate) / 1,667).  
b The value for X1 applies at a total jitter probability of 10-12. At this level of probability direct visual comparison  
between the mask and actual signals is not a valid method for determining compliance with the jitter output  
requirements.  
c With a measurement bandwidth of 1.5 times the baud rate (i.e. 4.5 GHz for 3.0 Gbps).  
d The skew measurement shall be made at the midpoint of the transition with a repeating 0101b pattern on the physical  
link. The same stable trigger, coherent to the data stream, shall be used for both the Rx+ and Rx- signals. Skew is  
defined as the time difference between the means of the midpoint crossing times of the Rx+ signal and the Rx- signal.  
e Near-end crosstalk is the unwanted signal amplitude at receiver terminals DR, CR, and XR coupled from signals and  
noise sources other than the desired signal. Refer to SFF-8410.  
9.5.2.3.1 Jitter  
Table 31 defines the maximum allowable jitter .  
Table 31: Maximum allowable jitter  
1.5 Gbps m, n  
3.0 Gbps m, n  
Deterministic jitterq  
Total jitterc,d,e,f  
Deterministic jittere  
Total jitterc,d,e,f  
0.35  
0.55  
0.35  
0.55  
a Units are in UI.  
b The values for jitter in this section are measured at the average amplitude point.  
c Total jitter is the sum of deterministic jitter and random jitter. If the actual deterministic jitter is less than the maximum  
specified, then the random jitter may increase as long as the total jitter does not exceed the specified maximum total  
jitter.  
d Total jitter is specified at a probability of 10-12  
.
e The deterministic and total values in this table apply to jitter after application of a single pole high-pass frequency-  
weighting function that progressively attenuates jitter at 20 dB/decade below a frequency of ((bit rate) / 1 667).  
f
If total jitter received at any point is less than the maximum allowed, then the jitter distribution of the signals is allowed  
to be asymmetric. The total jitter plus the magnitude of the asymmetry shall not exceed the allowed maximum total  
jitter. The numerical difference between the average of the peaks with a BER < 10-12 and the average of the  
individual events is the measure of the asymmetry. Jitter peak-to-peak measured < (maximum total jitter -  
|Asymmetry|).  
72  
Cheetah 15K.6 SAS Product Manual, Rev. B  
 
9.5.2.3.2  
Receiver jitter tolerance  
Table 32 defines the amount of jitter the receiver shall tolerate .  
Table 32:  
1.5 Gbpsa  
Receiver jitter tolerance  
3.0 Gbpsa  
Sinusoidal  
jitterb,c  
Deterministic  
jittere,f,h  
Total  
jitterh  
Sinusoidal  
jitterb,d  
Deterministic  
jittere,g,h  
Total  
jitterh  
0.10  
0.35  
0.65  
0.10  
0.35  
0.65  
a Units are in UI.  
b The jitter values given are normative for a combination of deterministic jitter, random jitter, and sinusoidal jitter that  
receivers shall be able to tolerate without exceeding a BER of 10-12. Receivers shall tolerate sinusoidal jitter of  
progressively greater amplitude at lower frequencies, according to the mask in figure 20 with the same deterministic  
jitter and random jitter levels as were used in the high frequency sweep.  
c Sinusoidal swept frequency: 900 kHz to > 5 MHz.  
d Sinusoidal swept frequency: 1.800 kHz to > 5 MHz.  
e No value is given for random jitter. For compliance with this standard, the actual random jitter amplitude shall be the  
value that brings total jitter to the stated value at a probability of 10-12. The additional 0.1 UI of sinusoidal jitter is  
added to ensure the receiver has sufficient operating margin in the presence of external interference.  
f
Deterministic jitter: 900 kHz to 750 MHz.  
g Deterministic jitter: 1.800 kHz to 1.500 MHz.  
h The deterministic and total values in this table apply to jitter after application of a single pole high-pass frequency-  
weighting function that progressively attenuates jitter at 20 dB/decade below a frequency of ((bit rate) / 1.667).  
9.5.2.3.3  
Compliant jitter test pattern (CJTPAT)  
The CJTPAT within a compliant protocol frame is used for all jitter testing unless otherwise specified. See the  
SAS Interface Manual for definition of the required pattern on the physical link and information regarding spe-  
cial considerations for scrambling and running disparity.  
9.5.2.3.4  
Impedance specifications  
Table 33 defines impedance requirements.  
Table 33:  
Impedance requirements (Sheet 1 of 2)  
Requirement  
Units  
1.5 Gbps  
3.0 Gbps  
a,b  
Time domain reflectometer rise time 20 % to 80 %  
ps  
100  
50  
Media (PCB or cable)  
b,c,d  
Differential impedance  
ohm  
ohm  
ohm  
100 ± 10  
5
100 ± 10  
5
b,c,d,g  
Differential impedance imbalance  
b,c,d  
Common mode impedance  
32.5 ± 7.5  
32.5 ± 7.5  
Mated connectors  
b,c,d  
Differential impedance  
ohm  
ohm  
ohm  
100 ± 15  
5
100 ± 15  
5
b,c,d,g  
Differential impedance imbalance  
b,c,d  
Common mode impedance  
32.5 ± 7.5  
32.5 ± 7.5  
Receiver termination  
b,e,f  
Differential impedance  
ohm  
ohm  
ps  
100 ± 15  
5
100 ± 15  
5
b,e,f,g  
Differential impedance imbalance  
b,e,f  
Receiver termination time constant  
150 max  
100 max  
Cheetah 15K.6 SAS Product Manual, Rev. B  
73  
     
Table 33:  
Impedance requirements (Sheet 2 of 2)  
Requirement  
Units  
1.5 Gbps  
3.0 Gbps  
b,e  
Common mode impedance  
ohm  
20 min/40 max 20 min/40 max  
Transmitter source termination  
b
Differential impedance  
ohm  
ohm  
ohm  
60 min/115 max 60 min/115 max  
b,g  
Differential impedance imbalance  
5
5
b
Common mode impedance  
15 min/40 max 15 min/40 max  
a All times indicated for time domain reflectometer measurements are recorded times. Recorded times are twice the  
transit time of the time domain reflectometer signal.  
b All measurements are made through mated connector pairs.  
c The media impedance measurement identifies the impedance mismatches present in the media when terminated in  
its characteristic impedance. This measurement excludes mated connectors at both ends of the media, when  
present, but includes any intermediate connectors or splices. The mated connectors measurement applies only to the  
mated connector pair at each end, as applicable.  
d Where the media has an electrical length of > 4 ns the procedure detailed in SFF-8410, or an equivalent procedure,  
shall be used to determine the impedance.  
e The receiver termination impedance specification applies to all receivers in a TxRx connection and covers all time  
points between the connector nearest the receiver, the receiver, and the transmission line terminator. This  
measurement shall be made from that connector.  
f
At the time point corresponding to the connection of the receiver to the transmission line the input capacitance of the  
receiver and its connection to the transmission line may cause the measured impedance to fall below the minimum  
impedances specified in this table. The area of the impedance dip (amplitude as ρ, the reflection coefficient, and  
duration in time) caused by this capacitance is the receiver termination time constant. The receiver time constant  
shall not be greater than the values shown in this table. An approximate value for the receiver termination time  
constant is given by the product of the amplitude of the dip (as ρ) and its width (in ps) measured at the half amplitude  
point. The amplitude is defined as being the difference in the reflection coefficient between the reflection coefficient at  
the nominal impedance and the reflection coefficient at the minimum impedance point. The value of the receiver  
excess input capacitance is given by the following equation:  
receiver termination time constant  
C = -----------------------------------------------------------------------------------------  
(R0 | RR)  
where (R0 || RR) is the parallel combination of the transmission line characteristic impedance and  
termination resistance at the receiver.  
g The difference in measured impedance to ground on the plus and minus terminals on the interconnect, transmitter or  
receiver, with a differential test signal applied to those terminals.  
9.5.2.4  
Electrical TxRx connections  
TxRx connections may be divided into TxRx connection segments. In a single TxRx connection individual  
TxRx connection segments may be formed from differing media and materials, including traces on printed wir-  
ing boards and optical fibers. This subclause applies only to TxRx connection segments that are formed from  
electrically conductive media.  
Each electrical TxRx connection segment shall comply with the impedance requirements of table 33 for the  
media from which they are formed. An equalizer network, if present, shall be part of the TxRx connection.  
TxRx connections that are composed entirely of electrically conducting media shall be applied only to homoge-  
nous ground applications (e.g., between devices within an enclosure or rack, or between enclosures intercon-  
nected by a common ground return or ground plane).  
9.5.2.4.1  
Transmitter characteristics  
The drive are D.C. coupled.  
74  
Cheetah 15K.6 SAS Product Manual, Rev. B  
A combination of a zero-length test load and the transmitter compliance transfer function (TCTF) test load  
methodology is used for the specification of transmitter characteristics. This methodology specifies the trans-  
mitter signal at the test points on the required test loads. The transmitter uses the same settings (e.g., pre-  
emphasis, voltage swing) with both the zero-length test load and the TCTF test load. The signal specifications  
at IR are met under each of these loading conditions.  
The TCTF is the mathematical statement of the transfer function through which the transmitter shall be capable  
of producing acceptable signals as defined by a receive mask. The transmission magnitude response of the  
TCTF in dB is given by the following equation for 1.5 Gbps:  
S21 = –20 × log10(e) × ((6, 5 × 10–6 × f0, 5) + (2, 0 × 10–10 × f) + (3, 3 × 10–20 × f2)) dB  
for 50 MHz < f < 1.5 GHz, and:  
S21 = –5, 437dB  
for 1.5 GHz < f < 5.0 GHz,  
where:  
a) f is the signal frequency in hertz.  
The transmission magnitude response of the TCTF in dB is given by the following equation for 3.0 Gbps:  
S21 = –20 × log10(e) × ((6, 5 × 10–6 × f0, 5) + (2, 0 × 10–10 × f) + (3, 3 × 10–20 × f2)) dB  
for 50 MHz < f < 3.0 GHz, and:  
S21 = –10, 884dB  
for 3.0 GHz < f < 5.0 GHz,  
where f is the signal frequency in hertz.  
The TCTF is used to specify the requirements on transmitters that may or may not incorporate pre-emphasis or  
other forms of compensation. A compliance interconnect is any physical interconnect with loss equal to or  
greater than that of the TCTF at the above frequencies that also meets the ISI loss requirements shown in fig-  
ure 23 and figure 24.  
Compliance with the TCTF test load requirement is verified by measuring the signal produced by the transmit-  
ter through a physical compliance interconnect attached to the transmitter.  
Compliance with the zero-length test load requirement verified by measurement made across a load equiva-  
lent to the zero-length load shown in figure 22.  
For both test load cases, the transmitter delivers the output voltages and timing listed in table 30 at the desig-  
nated compliance points. The default mask is IR for intra-cabinet TxRx connections. The eye masks are shown  
in 9.5.2.1.  
Figure 21 shows the compliance interconnect test load.  
10 nF  
50 ohm  
50 ohm  
Tx+  
Tx-  
Probe  
points  
TCTF  
10 nF  
SAS internal connector  
Figure 21. Compliance interconnect test load  
Cheetah 15K.6 SAS Product Manual, Rev. B  
75  
 
Figure 22 shows the zero-length test load.  
50 ohm  
50 ohm  
10 nF  
Tx+  
Tx-  
Probe  
points  
10 nF  
SAS internal connector  
Figure 22. Zero-length test load  
Figure 23 shows an ISI loss example at 3.0 Gbps.  
S21 (dB)  
Compliance interconnect magnitude response and  
ISI loss example for 3.0 Gbps  
0
ISI loss  
> 3.9 dB  
-10.9 dB  
Sample compliance interconnect  
Frequency (GHz)  
0.3  
1.5  
3.0  
Figure 23. ISI loss example at 3.0 Gbps  
Figure 24 shows an ISI loss example at 1.5 Gbps.  
S21 (dB)  
Compliance interconnect magnitude response and ISI  
loss example for 1.5 Gbps  
0
ISI loss  
> 2.0 dB  
-5.4 dB  
Sample compliance interconnect  
Frequency (GHz)  
0.15  
0.75  
1.5  
Figure 24. ISI loss example at 1.5 Gbps  
76  
Cheetah 15K.6 SAS Product Manual, Rev. B  
     
9.5.2.5  
Receiver characteristics  
The drive receiver is A.C. coupled. The receive network terminates the TxRx connection by a 100 ohm equiva-  
lent impedance as specified in table 33.  
-12  
The receiver operates within a BER of 10 when a SAS signal with valid voltage and timing characteristics is  
delivered to the compliance point from a 100 ohm source. The received SAS signal are considered valid if it  
meets the voltage and timing limits specified in table 30.  
Additionally the receiver operates within the BER objective when the signal at a receiving phy has the addi-  
tional sinusoidal jitter present that is specified in table 32 and the common mode signal V  
over frequency  
CM  
range F  
as specified in table 28. The jitter tolerance is shown in Figure 20 for all Rx compliance points in a  
CM  
TxRx connection. The figure given assumes that any external interference occurs prior to the point at which the  
test is applied. When testing the jitter tolerance capability of a receiver, the additional 0.1 UI of sinusoidal jitter  
may be reduced by an amount proportional to the actual externally induced interference between the applica-  
tion point of the test and the input to the receiving phy. The additional jitter reduces the eye opening in both  
voltage and time.  
Cheetah 15K.6 SAS Product Manual, Rev. B  
77  
78  
Cheetah 15K.6 SAS Product Manual, Rev. B  
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80  
Cheetah 15K.6 SAS Product Manual, Rev. B  
unformatted 11  
check condition status 62  
chemical pollutants 40  
class B limit 3  
clear ACA function 51  
clear task set function 51  
commands supported 53  
condensation 37  
condition met/good status 62  
connector  
Index  
Numerics  
12 volt  
pins 67  
5 volt pins 67  
A
illustrated 65  
requirements 65  
abort task set function 51  
AC coupling 67  
continuous vibration 39  
cooling 47  
corrosive environment 39  
CRC  
AC power requirements 23  
ACA active status 62  
ACA active, faulted initiator status 62  
acoustics 39  
error 16  
Current profiles 27  
customer service 21  
active LED Out signal 67  
actuator  
assembly design 7  
adaptive caching 62  
AFR 9  
D
air cleanliness 39  
DAR 46  
data heads  
read/write 11  
data rate  
internal 11  
data transfer rate 12  
DC power 66  
requirements 23  
defect and error management 43  
defects 43  
Deferred Auto-Reallocation 46  
deferred error handling 62  
description 7  
dimensions 40  
disc rotation speed 11  
drive 39  
drive characteristics 11  
drive mounting 40, 49  
drive select 66  
air flow 47, 48  
illustrated 48  
air inlet 47  
altitude 37  
ambient 36  
ambient temperature 47  
ANSI documents  
SCSI 5  
Serial Attached SCSI 5  
asynchronous event notification 62  
audible noise 3  
auto write and read reallocation  
programmable 8  
automatic contingent allegiance 62  
average idle current 23, 24, 25, 26  
average rotational latency 11  
B
dual port support 52  
Background Media Scan 45  
backpanel 66  
BMS 45  
E
buffer  
electrical  
data 8  
space 13  
busy status 62  
description of connector 66  
signal characteristics 67  
specifications 23  
electromagnetic compatibility 3  
electromagnetic susceptibility 40  
EMI requirements 3  
environment 47  
C
cache operation 13  
cache segments 13  
environmental  
caching write data 14  
Canadian Department of Communications 3  
capacity  
limits 36  
requirements 15  
Cheetah 15K.6 SAS Product Manual, Rev. B  
81  
environmental control 39  
error  
IRAW 46  
management 43  
rates 15  
errors 43  
J
jumpers 47  
L
latency  
F
FCC rules and regulations 3  
features 8  
average rotational 11, 12  
logical block address 13  
logical block reallocation scheme 8  
logical block size 8, 12  
logical segments 13  
interface 51  
firmware 8  
corruption 56  
flawed sector reallocation 8  
Format command execution time 12  
function  
M
complete, code 00 51  
not supported, code 05 51  
reject, code 04 51  
maintenance 15  
maximum delayed motor start 23, 24, 25, 26  
maximum start current 23, 24, 25, 26  
media description 8  
Media Pre-Scan 45  
miscellaneous feature support  
Adaptive caching 62  
G
Good status 62  
gradient 36, 37  
ground shift noise 67  
grounding 49  
Asynchronous event notification 62  
Automatic contingent allegiance 62  
Deferred error handling 62  
Parameter rounding 62  
Queue tagging 62  
H
HDA 47, 49  
Reporting actual retry count 62  
Segmented caching 62  
SMP = 1 in Mode Select command 62  
Synchronized (locked) spindle operation 62  
Zero latency read 62  
head and disc assembly. See HDA  
heads  
read/write data 11  
heat removal 47  
heat source 47  
host equipment 49  
hot plugging the drive 16  
humidity 37  
miscellaneous status support  
ACA active 62  
ACA active, faulted initiator 62  
Busy 62  
humidity limits 36  
Check condition 62  
Condition met/good 62  
Good 62  
Intermediate/condition met/good 62  
Intermediate/good 62  
Reservation conflict 62  
Task set full 62  
I
Idle Read After Write 46  
inquiry data 57  
installation 47  
interface  
miscorrected media data 15  
Mode sense  
data, table 57  
mounting 49  
commands supported 53  
error rate 15  
errors 16  
illustrated 63  
physical 62  
holes 49  
orientations 47  
requirements 51  
intermediate/condition met/good status 62  
intermediate/good status 62  
internal data rate 11  
internal defects/errors 43  
internal drive characteristics 11  
N
noise  
audible 3  
noise immunity 27  
82  
Cheetah 15K.6 SAS Product Manual, Rev. B  
non-operating 37, 39  
temperature 36  
reliability 9  
specifications 15  
non-operating vibration 39  
reliability and service 16  
repair and return information 21  
reporting actual retry count 62  
reservation conflict status 62  
resonance 37  
O
office environment 39  
operating 37, 39  
option selection 66  
out-of-plane distortion 49  
return information 21  
rotation speed 11  
S
P
safety 3  
SAS  
package size 38  
package test specification 5  
packaged 38  
interface 66  
physical interface 62  
task management functions 51  
SAS documents 5  
SAS Interface Manual 3, 5  
SCSI interface  
commands supported 53  
seek error  
defined 16  
rate 15  
seek performance characteristics 11  
seek time  
average typical 11  
full stroke typical 11  
single track typical 11  
segmented caching 62  
Self-Monitoring Analysis and Reporting Technology  
9, 17  
Serial Attached SCSI (SAS) Interface Manual 1  
shielding 3  
shipping 21  
shipping container 36  
shock 37  
and vibration 37  
shock mount 49  
parameter rounding 62  
PCBA 49  
peak bits per inch 11  
peak operating current 23, 24, 25, 26  
peak-to-peak measurements 27  
performance characteristics  
detailed 11  
general 12  
performance degradation 37  
performance highlights 8  
physical damage 39  
physical dimensions 40  
physical interface 62  
physical specifications 23  
pin descriptions 66  
power 67  
dissipation 30  
requirements, AC 23  
requirements, DC 23  
sequencing 27  
power distribution 3  
prefetch/multi-segmented cache control 13  
preventive maintenance 15  
signal  
Q
characteristics 67  
single-unit shipping pack kit 9  
SMART 9, 17  
queue tagging 62  
SMP = 1 in Mode Select command 62  
spindle brake 8  
standards 3  
start/stop time 12  
Sulfur 40  
support services 79  
surface stiffness  
allowable for non-flat surface 49  
switches 47  
synchronized spindle  
operation 62  
R
radio interference regulations 3  
RCD bit 13  
read error rates 15, 43  
read/write data heads 11  
receivers 67  
recommended mounting 38  
Recoverable Errors 15  
recovered media data 15  
reference  
documents 5  
system chassis 49  
relative humidity 37  
Cheetah 15K.6 SAS Product Manual, Rev. B  
83  
T
task management functions 51  
Abort task set 51  
Clear ACA 51  
Clear task set 51  
terminate task 51  
task management response codes 51  
Function complete 00 51  
Function not supported 05 51  
Function reject 04 51  
task set full status 62  
technical support services 79  
temperature 36, 47  
limits 36  
non-operating 36  
regulation 3  
See also cooling  
terminate task function 51  
terminators 47  
tracks per inch 11  
transmitters 67  
transporting the drive 21  
U
unformatted 9  
Unrecoverable Errors 15  
unrecovered media data 15  
V
vibration 37, 39  
W
warranty 21  
Z
zero latency read 62  
zone bit recording (ZBR) 8  
84  
Cheetah 15K.6 SAS Product Manual, Rev. B  
Seagate Technology LLC  
920 Disc Drive, Scotts Valley, California 95066-4544, USA  
Publication Number: 100466193, Rev. B, Printed in USA  

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