Seagate ST4000DX001,ST1000DX001,ST2000DX001 Product Manual
Desktop SSHD
Product Manual
ST4000DX001
ST2000DX001
ST1000DX001
100726566, Rev. K
May 2016
Document Revision History
Revision Date Pages affected and Description of Change
Rev. A 04/30/2013 Initial release
Rev. B 06/07/2013 Added 4TB model and related specifications throughout.
Rev. C 03/18/2014
4 & 12: Revised: Copyright text (below); Warranty URL & text
4: Replaced MTBF w/AFR in Rated Workload text
Rev. D 05/08/2014 16-17) Add metric “mm” values to mechanical drawings
Rev. E 07/17/2014 22-23: Edit Words 82, 83, 85 & 86 values, add Word 91 and edit AAM note
Rev. F 08/18/2015
FC & BC: New logo & cover design
19-20: Replaced mechanical drawings to correct side hole dimension
Rev. G 09/22/2015 7: Revised Rated Workload statement & Added “AFR <1.0% based on 2400 POH”
4: Updated Support page URL’s
Rev. H 10/20/2015
19-20: Revised Fastener Depth Penetration to “.14 max” & in Mechanical Drawing and
corrected Figure 3 & 4 Mechanical Drawing titles
7: Corrected Op Shock to 80Gs at 2 ms
Rev. J 04/14/2016
14: Removed last sentence in Section 2.9.5.1
20: Updated Mechanical Drawing for 2TB model
6 & 13: Revised to Op & Non-Op temp descriptions & Updated Wet Bulb values
lb values
Rev. K 05/20/2016
7 & 13: Updated Wet Bu
15: Added Section 2.12.1 Storage
16: Updated to Korean RRA & Australian RCM
19 & 21: Revised Fastener Penetration Depth to 0.120” in text and Figures 3 & 4 Mechanical
Drawings
© 2016 Seagate Technology LLC. All rights reserved.
Publication number: 100726566, Rev. K May 2016
Seagate, Seagate Technology and the Swirl logo are registered trademarks of Seagate Technology LLC in the United States and/or other countries. Seagate AcuTrac, OptiCache, SmartAlign
and SeaTools are either trademarks or registered trademarks of Seagate Technology LLC or one of its affiliated companies in the United States and/or other countries. All other trademarks
or registered trademarks are the property of their respective owners.
No part of this publication may be reproduced in any form without written permission of Seagate Technology LLC.
Call 877-PUB-TEK1(877-782-8351) to request permission.
When referring to drive capacity, one gigabyte, or GB, equals one billion bytes and one terabyte, or TB, equals one trillion bytes. Your computer’s operating system may use a different
standard of measurement and report a lower capacity. In addition, some of the listed capacity is used for formatting and other functions, and thus will not be available for data storage.
Actual quantities will vary based on various factors, including file size, file format, features and application software. Actual data rates may vary depending on operating environment and
other factors. The export or re-export of hardware or software containing encryption may be regulated by the U.S. Department of Commerce, Bureau of Industry and Security (for more
information, visit www.bis.doc.gov), and controlled for import and use outside of the U.S. Seagate reser ves the right to change, without notice, product offerings or specifications.
Contents
Seagate® Technology Support Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 About the SATA interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.0 Drive Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Specification summary tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Formatted capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.1 LBA mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Default logical geometry. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Recording and interface technology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.6 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.7 Start/stop times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.8 Power specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.8.1 Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.8.2 Conducted noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.8.3 Voltage tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.8.4 Power-management modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.9 Environmental specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.9.1 Ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.9.2 Temperature gradient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.9.3 Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.9.4 Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.9.5 Shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.9.6 Vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.10 Acoustics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.10.1 Test for Prominent Discrete Tones (PDTs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.11 Electromagnetic immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.12 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.12.1 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.13 Agency certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.13.1 Safety certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.13.2 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.13.3 FCC verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.14 Environmental protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.14.1 European Union Restriction of Hazardous Substances (RoHS) Directive. . . . . . . . . . . . . . 17
2.14.2 China Restriction of Hazardous Substances (RoHS) Directive . . . . . . . . . . . . . . . . . . . . . . . 17
2.15 Corrosive environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.0 Configuring and Mounting the Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1 Handling and static-discharge precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2 Configuring the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.3 SATA cables and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.0 SATA Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.1 Hot-Plug compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.2 SATA device plug connector pin definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3 Supported ATA commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3.1 Identify Device command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3.2 Set Features command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.3.3 S.M.A.R.T. commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Seagate Desktop SSHD Product Manual, Rev. K 2
Figures
Figure 1 DC power requirements (4-disk: 4TB model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 2 Attaching SATA cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 3 Mounting dimensions (4TB model). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 4 Mounting dimensions (2TB model). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 5 Mounting dimensions (1TB model). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Seagate Desktop SSHD Product Manual, Rev. K 3
Seagate® Technology Support Services
For information regarding online support and services, visit: http://www.seagate.com/contacts/
For information regarding Warranty Support, visit: http://www.seagate.com/support/warranty-and-replacements/
For information regarding data recovery services, visit: http://www.seagate.com/services-software/data-recovery-services/
For Seagate OEM, Distribution partner and reseller portals, visit: http://www.seagate.com/partners/
Seagate Desktop SSHD Product Manual, Rev. K 4
1.0 Introduction
This manual describes the functional, mechanical and interface specifications for the following
Seagate
®
Desktop SSHD model drives:
ST4000DX001 ST2000DX001 ST1000DX001
These drives provide the following key features:
• 5900 and 7200 RPM spindle speed
•8GB NAND flash
• Compliant with RoHS requirements in China and Europe
• Full-track multiple-sector transfer capability without local processor intervention
• High instantaneous (burst) data-transfer rates (up to 600MB per second)
• Native Command Queuing with command ordering to increase performance in demanding applications
•Quiet operation
• Seagate AcuTrac™ servo technology delivers dependable performance, even with hard drive track widths of only 75
nanometers.
• Seagate OptiCache™ technology boosts overall performance by as much as 45% over the previous generation.
• Seagate SmartAlign™ technology provides a simple, transparent migration to Advanced Format 4K sectors.
• SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
• State-of-the-art cache and on-the-fly error-correction algorithms
• Support for S.M.A.R.T. drive monitoring and reporting
• Supports latching SATA cables and connectors
• TGMR recording technology provides the drives with increased areal density.
• Worldwide Name (WWN) capability uniquely identifies the drive
1.1 About the SATA interface
The Serial ATA (SATA) interface provides several advantages over the traditional (parallel) ATA interface. The primary
advantages include:
• Easy installation and configuration with true plug-and-play connectivity. It is not necessary to set any jumpers or other
configuration options.
• Scalability to higher performance levels.
• Thinner and more flexible cabling for improved enclosure airflow and ease of installation.
In addition, SATA makes the transition from parallel ATA easy by providing legacy software support. SATA was designed to
allow users to install a SATA host adapter and SATA disk drive in the current system and expect all of the existing
applications to work as normal.
The SATA interface connects each disk drive in a point-to-point configuration with the SATA host adapter. There is no
master/slave relationship with SATA devices like there is with parallel ATA. If two drives are attached on one SATA host
adapter, the host operating system views the two devices as if they were both “masters” on two separate ports. This
essentially means both drives behave as if they are Device 0 (master) devices.
The SATA host adapter and drive share the function of emulating parallel ATA device behavior to provide backward
compatibility with existing host systems and software. The Command and Control Block registers, PIO and DMA data
transfers, resets, and interrupts are all emulated.
The SATA host adapter contains a set of registers that shadow the contents of the traditional device registers, referred to as
the Shadow Register Block. All SATA devices behave like Device 0 devices. For additional information about how SATA
emulates parallel ATA, refer to the “Serial ATA International Organization: Serial ATA Revision 3.2. The specification can be
downloaded from www.sata-io.or
The host adapter may, optionally, emulate a master/slave environment to host software where two devices
Note
on separate SATA ports are represented to host software as a Device 0 (master) and Device 1 (slave)
accessed at the same set of host bus addresses. A host adapter that emulates a master/slave environment
manages two sets of shadow registers. This is not a typical SATA environment.
g.
Seagate Desktop SSHD Product Manual, Rev. K 5
www.seagate.com Drive Specifications
2.0 Drive Specifications
Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal power. For
convenience, the phrases the drive and this drive are used throughout this manual to indicate the following drive models:
ST4000DX001 ST2000DX001 ST1000DX001
2.1 Specification summary tables
The specifications listed in Table 1 are for quick reference. For details on specification measurement or definition, refer to
the appropriate section of this manual.
Table 1 Drive specifications summary for 4TB, 2TB and 1TB models
Drive Specification* ST4000DX001 ST2000DX001 ST1000DX001
Formatted capacity (512 bytes/sector)** 4000GB (4TB) 2000GB (2TB) 1000GB (1TB)
Guaranteed sectors 7,814,037,168 3,907,029,168 1,953,525,168
Heads 8 4 2
Disks 4 2 1
NAND flash Commercial Multilevel Cell
(cMLC)/size
Bytes per sector
(4K physical emulated at 512-byte sectors)
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Recording density (max) 1807kFCI
Track density (avg) 340ktracks/in
Areal density (avg) 625Gb/in
Spindle speed 5900 RPM 7200 RPM
Internal data transfer rate (max) 1813Mb/s 2147Mb/s
Average data rate, read/write 146MB/s 156MB/s
Maximum sustained data rate, OD read 180MB/s 210MB/s
I/O data-transfer rate (max) 600MB/s
Cache buffer 64MB
Height (max) 26.1mm / 1.028 in 20.17mm / 0.7825 in
Width (max) 101.6mm /4.0 in (+
Length (max) 146.99mm / 5.787 in
Weight (typical) 610g / 1.345 lb 535g / 1.18 lb 400g / 0.88 lb
Average latency 5.1ms 4.16ms
Power-on to ready (max)
Standby to ready (max)
Average seek, read (typical)
Average seek, write (typical)
Startup current 12V 2.0A
Voltage tolerance (including noise)
Non-Operating (Ambient °C) –40° to 70°
Operating ambient temperature (min °C) 0°
Operating temperature (Drive case max °C) 60°
Temperature gradient
‡
‡
<1.0s <1.0s
<1.0s <1.0s
<12.0ms typical
<12.0ms typical
5V: ±5%
12V: ±10%
20°C per hour max (operating)
30°C per hour max (non-operating)
cMLC/8GB
4096
2
0.010 in)
<8.5ms (read)
<9.5ms (write)
5V: ±5%
12V: +10% / -7.5%
Seagate Desktop SSHD Product Manual, Rev. K 6
Table 1 Drive specifications summary for 4TB, 2TB and 1TB models (continued)
Drive Specification* ST4000DX001 ST2000DX001 ST1000DX001
Relative humidity
5% to 90% (operating)
5% to 95% (non-operating)
5% to 95% (operating)
5% to 95% (non-operating)
Relative humidity gradient (max) 30% per hour
Wet bulb temperature (max)
Altitude, operating
Altitude, nonoperating
(below mean sea level, max)
26°C (operating)
29°C (nonoperating)
–304m to 3048m
(–1000 ft to 10,000 ft)
–304m to12,192m
(–1000 ft to 40,000+ ft)
Operational shock (max) 80 Gs at 2ms
Non-operational shock (max) 300 Gs at 2ms 350 Gs at 2ms
2Hz to 22Hz: 0.25 Gs, Limited displacement
Vibration, operating
22Hz to 350Hz: 0.50 Gs
350Hz to 500Hz: 0.25 Gs
5Hz to 22Hz: 3.0 Gs
Vibration, non-operating
22Hz to 350Hz: 3.0 Gs
350Hz to 500Hz: 3.0 Gs
Drive acoustics, sound power
Idle***
Seek
2.3 bels (typical)
2.5 bels (max)
2.8 bels (typical)
3.0 bels (max)
Non-recoverable read errors 1 per 10
2.4 bels (typical)
2.6 bels (max)
2.6 bels (typical)
2.7 bels (max)
14
bits read
2.2 bels (typical)
2.4 bels (max)
2.4 bels (typical)
2.5 bels (max)
Annualized Failure Rate (AFR) <1.0% based on 2400 POH
Average annualized workload rating: <55 TB/year.
The AFR specification for the product assumes the I/O workload does not exceed
Rated Workload
the average annualized workload rate limit of 55 TB/year. Workloads exceeding the
annualized rate may degrade the product AFR and impact reliability as experienced
by the particular application. The average annualized workload rate limit is in units
of TB per calendar year.
To determine the warranty for a specific drive, use a web browser to access the
following web page:
Warranty
http://www.sea
From this page, click on “Is my Drive under Warranty”. Users will be asked to provide
gate.com/support/warranty-and-replacements/
the drive serial number, model number (or part number) and country of purchase.
The system will display the warranty information for the drive.
Load/Unload cycles (25°C, 50% rel. humidity) 300,000
Supports Hotplug operation per the
Serial ATA Revision 3.2 specification
Ye s
* All specifications above are based on native configurations.
** One GB equals one billion bytes and 1TB equals one trilli on bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
*** During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and power to operational levels.
‡
Hybrid time-to-ready specification assumes all needed data files are pinned to flash, Windows 8 environment, and fast BIOS implemented.
2.2 Formatted capacity
Model Formatted capacity* Guaranteed sectors Bytes per sector
ST4000DX001 4000GB 7,814,037,168
ST1000DX001 1000GB 1,953,525,168
*One GB equals one billion bytes and 1TB equals one trillion bytes when referring to hard drive capacity. Accessible capacity may vary depending on
operating environment and formatting.
Seagate Desktop SSHD Product Manual, Rev. K 7
4KST2000DX001 2000GB 3,907,029,168
www.seagate.com Drive Specifications
2.2.1 LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1, where n is the
number of guaranteed sectors as defined above.
See Section 4.3.1, "Identify Device command" (words 60-61 and 100-103) for additional information about 48-bit
addressing support of drives with capacities over 137GB.
2.3 Default logical geometry
• Cylinders: 16,383
• Read/write heads: 16
• Sectors per track: 63
LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1, where n is the
number of guaranteed sectors as defined above.
2.4 Recording and interface technology
Interface SATA
Recording method TGMR
Recording density (kFCI) 1807
Track density (ktracks/inch avg)
Areal density (Gb/in
Spindle speed (RPM)
Internal data transfer rate (Mb/s max)
Maximum sustained data transfer rate, OD read (MB/s
Average data rate, read/write (MB/s)
2
)625
1TB and 2TB 352
4TB 340
1TB and 2TB 7200 ± 0.2%
4TB 5900 ± 0.2%
1TB and 2TB 2147
4TB 1813
1TB and 2TB 210
4TB 180
1TB and 2TB 156
I/O data-transfer rate (MB/s max) 600
Seagate Desktop SSHD Product Manual, Rev. K 8
4TB 146
www.seagate.com Drive Specifications
2.5 Physical characteristics
Maximum height
4TB and 2TB 26.1mm / 1.028 in
1TB 20.17mm / 0.7825 in
Maximum width (all models)
Maximum length (all models)
Typic al weig ht
101.6mm / 4.0 in (± 0.010 in)
146.99mm / 5.787 in
4TB 610g / 1.345 lb
2TB 535g / 1.18 lb
1TB 400g / 0.88 lb
Cache buffer
64MB (64,768kb)
2.6 Seek time
Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive
diagnostics. The specifications in the table below are defined as follows:
• Track-to-track seek time is an average of all possible single-track seeks in both directions.
• Average seek time is a true statistical random average of at least 5000 measurements of seeks between random tracks,
less overhead.
Typical seek times (ms) Read Write
Track-to-track 1.0 1.2
Average 8.5 9.5
Average latency 4.16
These drives are designed to consistently meet the seek times represented in this manual. Physical seeks,
Note
regardless of mode (such as track-to-track and average), are expected to meet the noted values. However, due
to the manner in which these drives are formatted, benchmark tests that include command overhead or
measure logical seeks may produce results that vary from these specifications.
Seagate Desktop SSHD Product Manual, Rev. K 9
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