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Product Manual
®
Cheetah NS SAS
ST3400755SS
100453994
Rev. B
August 2007
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Copyright © 2007 Seagate Technology LLC. All rights reserved. Printed in U.S.A. Publication number: 100453994, Rev. B, August 2007 Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate Technology LLC in the United States and/or other countries. Cheetah, SeaTools and SeaTDD are either trademarks or reg- istered trademarks of Seagate Technology LLC or one of its affiliated companies in the United States and/ or other countries. All other trademarks or registered trade
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Contents 1.0 Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2.0 Standards, compliance and reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1 Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1.1 Electromagnetic compatibility. . . . . . . . . . . . . . . . . . . .
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6.4.2 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.4.3 Effective altitude (sea level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.4.4 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 6.4.5 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6.4.6 Air
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List of Figures Figure 1. Typical ST3400755SS drive +5V and +12V current profiles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 Figure 2. ST3400755SS (3 Gbit) DC current and power vs. input/output operations per second . . . . . . . . . . . . . . . . .25 Figure 3. Location of the HDA temperature check point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 Figure 4. Recommended mounting . . . . . . . . . . . . . . . .
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2 Cheetah NS SAS Product Manual, Rev. B
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1.0 Scope ® ® This manual describes Seagate Technology LLC, Cheetah NS SAS (Serial Attached SCSI) disk drives. Cheetah drives support the SAS Protocol specifications to the extent described in this manual. The SAS Inter- face Manual (part number 100293071) describes the general SAS characteristics of Cheetah NS and other Seagate SAS drives. Cheetah NS SAS Product Manual, Rev. B 1
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2 Cheetah NS SAS Product Manual, Rev. B
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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 mu
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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 � 3.5-inch floppy disk drive � Keyboard � Monitor/display �Printer � External modem �Mouse Al
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2.3 Reference documents SAS Installation Guide Seagate part number: 100453998 SCSI Commands Reference Manual Seagate part number: 100293068 SAS Interface Manual Seagate part number: 100293071 Applicable ANSI SAS documents SFF-8323 3.5” Drive Form Factor with Serial Connector SFF-8460 HSS Backplane Design Guidelines SFF-8470 Multi Lane Copper Connector SFF-8482 SAS Plug Connector ANSI INCITS.xxx Serial Attached SCSI (SAS) Standard (T10/1562-D) ISO/IEC 14776-xxx SCSI Architecure Model-3 (S
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6 Cheetah NS SAS Product Manual, Rev. B
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3.0 General description Cheetah drives combine Tunneling Magnetoresistive (TMR) heads and a Serial Attached SCSI (SAS) interface to provide high performance, high capacity data storage for a variety of systems including engineering worksta- tions, network servers, mainframes, and supercomputers. The Serial Attached SCSI interface is designed to meet next-generation computing demands for performance, scalability, flexibility and high-density storage requirements. Cheetah drives are random acce
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3.1 Standard features Cheetah NS SAS drives have the following standard features: � Perpendicular recording technology � 1.5 / 3 Gbit Serial Attached SCSI (SAS) interface � Integrated dual port SAS controller � Support for SAS expanders and fanout adapters � Downloadable firmware using the SAS interface � 128 - deep task set (queue) � Supports up to 32 initiators � Jumperless configuration. � User-selectable logical block size (512, 520, 524, or 528 bytes per logical block) � Programmable logica
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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 a multiple of 4 bytes. Users having the necessary equipment may modify the data block size before issuing a format command and obtain different formatted capacities than those listed. To provide a stable target capacity environment and at the same time provide users with flexibility if they choose, Seagate recommends product planning in one of two modes: 1
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10 Cheetah NS SAS Product Manual, Rev. B
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4.0 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Cheetah NS SAS drives. 4.1 Internal drive characteristics ST3400755SS * Drive capacity 400.0 Gbytes (formatted, rounded off value) Read/write data heads 8 Tracks per surface (total) 92,200 Tracks (user accessible) Tracks per inch 155,000 TPI Peak bits per inch 979k BPI 2 Areal Density 151.7 Gbits/inch Internal data rate 725 to 1,211 Mbits/sec (variable with
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4.2.2 Format command execution time (minutes) ST3400755SS 180 Maximum (with verify) 100 Maximum (without verify) 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 54 Mbytes/sec Maximum 97 Mbytes/sec SAS Interface maximum instantaneous transfer rate 300 Mbytes/sec* per port (dual p
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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 di
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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 previ
