Seagate ST1000NC000, ST2000NC001, ST3000NC000, ST3000NC002 User Manual
Product Manual
®
Constellation CS Serial ATA
Standard Models Seagate Instant Secure
Erase Models
ST3000NC002 ST3000NC000
ST2000NC001 ST2000NC000
ST1000NC001 ST1000NC000
100695091
Rev. C
November 2012
Document Revision History
Revision Date Description of Change
Rev. A 07/18/2012 Initial release.
Rev. B 10/05/2012 8-10 & 18.
Rev. C 11/13/2012 5, 16 & 19.
© 2012 Seagate Technology LLC. All rights reserved.
Publication number: 100695091, Rev. C November 2012
Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate Technology LLC in the United States and/
or other countries. Constellation CS 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. The FIPS logo is a certification mark of NIST, which
does not imply product endorsement by NIST, the U.S., or Canadian governments. 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 reserves the right to change, without notice,
product offerings or specifications.
Contents
Seagate® Technology Support Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.0 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 About the SATA interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.0 Drive Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Specification summary tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Formatted capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2.1 LBA mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Default logical geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Recording and interface technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.5 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.6 Seek time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.7 Start/stop times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.8 Power specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.8.1 Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.8.2 Conducted noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.8.3 Voltage tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.8.4 Power-management modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.9 Environmental limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.9.1 Ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.9.2 Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.9.3 Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.9.4 Shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.9.5 Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.10 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.11 Test for Prominent Discrete Tones (PDTs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.12 Electromagnetic immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.13 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.13.1 Annualized Failure Rate (AFR) and Mean Time Between Failures (MTBF). . . . . 19
2.14 Agency certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.14.1 Safety certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.14.2 Electromagnetic compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.14.3 FCC verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.15 Environmental protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.15.1 European Union Restriction of Hazardous Substances (RoHS) Directive . . . . . 21
2.15.2 China Restriction of Hazardous Substances (RoHS) Directive . . . . . . . . . . . . 21
2.16 Corrosive environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2.17 Product warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.0 Configuring and Mounting the Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1 Handling and static-discharge precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2 Configuring the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.3 SATA cables and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.0 About Seagate Instant Secure Erase drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1 Data encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.2 Cryptographic erase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3 Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.4 RevertSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.5 ATA Security Erase Unit Command on SED SATA drives. . . . . . . . . . . . . . . . . . . . . . . . . 25
4.6 Sanitize Feature Set on SED Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Constellation CS Serial ATA Product Manual, Rev. C
Contents
5.0 SATA Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.1 Hot-Plug compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.2 SATA device plug connector pin definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3 Supported ATA commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.3.1 Identify Device command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.3.2 Set Features command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.3.3 S.M.A.R.T. commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Constellation CS Serial ATA Product Manual, Rev. C
Figures
Figure 1 Typical 3TB model 5V - 6Gb/s startup and operation current profile . . . . . . . . . . . . . . . . . . . 9
Figure 2 Typical 3TB model 12V - 6Gb/s startup and operation current profile . . . . . . . . . . . . . . . . . . 9
Figure 3 Typical 2TB model 12V - 6Gb/s startup and operation current profiles . . . . . . . . . . . . . . . . 10
Figure 4 Typical 1TB model 12V - 6Gb/s startup and operation current profiles . . . . . . . . . . . . . . . . 11
Figure 5 Location of the HDA temperature check point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 6 Attaching SATA cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 7 Mounting dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Constellation CS Serial ATA Product Manual, Rev. C
Seagate® Technology Support Services
For information regarding online support and services, visit
http://www.seagate.com/about/contact-us/technical-support/
Available services include:
• Presales & Technical support
• Global Support Services telephone numbers & business hours
• Authorized Service Centers
For information regarding Warranty Support, visit http://www.seagate.com/support/warranty-and-returns/
For information regarding data recovery services, visit http://www.seagate.com/services-software/data-recovery-services/
For Seagate OEM and Distribution partner portal, visit https://direct.seagate.com/portal/system
For Seagate reseller portal, visit http://spp.seagate.com
Constellation CS Serial ATA Product Manual, Rev. C 1
www.seagate.com
1.0 Introduction
This manual describes the functional, mechanical and interface specifications for the following Seagate
Constellation® CS Serial ATA model drives:
Model Number Seagate Instant Secure Erase (ISE)
ST3000NC002 No
ST3000NC000 Yes
ST2000NC001 No
ST2000NC000 Yes
ST1000NC001 No
ST1000NC000 Yes
These drives provide the following key features:
• 7200 RPM spindle speed.
• PowerChoice™ for selectable power savings
• High instantaneous (burst) data-transfer rates (up to 600MB per second).
• Perpendicular recording technology provides the drives with increased areal density.
• State-of-the-art cache and on-the-fly error-correction algorithms.
• Native Command Queueing with command ordering to increase performance in demanding applications.
• Full-track multiple-sector transfer capability without local processor intervention.
• SeaTools™ diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
• Support for S.M.A.R.T. drive monitoring and reporting.
• Supports latching SATA cables and connectors.
• Worldwide Name (WWN) capability uniquely identifies the drive.
Constellation CS Serial ATA Product Manual, Rev. C 2
www.seagate.com
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.
• Thinner and more flexible cabling for improved enclosure airflow and ease of installation.
• Scalability to higher performance levels.
In addition, SATA makes the transition from parallel ATA easy by providing legacy software support. SATA was designed to
allow you to install a SATA host adapter and SATA disk drive in your current system and expect all of your 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 host adapter may, optionally, emulate a master/slave environment to host software where two devices on
Note
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 3.0”. The specification can be
downloaded from
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.
www.sata-io.org.
Constellation CS Serial ATA Product Manual, Rev. C 3
www.seagate.com
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:
Standard models Seagate In(SED) models
ST3000NC002 ST3000NC000
ST2000NC001 ST2000NC000
ST1000NC001 ST1000NC000
2.1 Specification summary tables
The specifications listed in Table 1.
For details on specification measurement or definition, refer to the appropriate section of this manual.
Table 1 Drive specifications summary for 3TB, 2TB and 1TB models
Drive Specification*
Formatted capacity (512 bytes/sector)* 3000GB (3TB) 2000GB (2TB) 1000GB (1TB)
Guaranteed sectors 5,860,533,168 3,907,029,168 1,953,525,168;
Heads 6 4 2
Disks 3 2 1
Bytes per sector 4096 (512 byte emulation)
Default sectors per track 63
Default read/write heads 16
Default cylinders 16,383
Recording density, KBPI (Kb/in max) 1807
Track density, KTPI (ktracks/in avg.) 340
Areal density, (Gb/in2 avg) 625
Spindle speed (RPM) 7200
Internal data transfer rate (Mb/s max) 2147
Sustained data transfer rate OD (MB/s) 150 to 180
I/O data-transfer rate MB/s max) 600
ATA data-transfer modes supported
Cache buffer 64MB
Height (max) 26.1mm / 1.028 in 20.17mm / 0.7825 in
Width (max) 101.85mm /4.010 in
Length (max) 147.00mm / 5.787 in
Weight (typical) 626g (1.38 lb) 535g (1.18 lb) 400g (0.88 lb)
Average latency 4.16ms
Power-on to ready (sec max) 15.0 10.0 7.0
Standby to ready (sec max) 15.0 10.0 7.0
Track-to-track seek time (ms typical)
Average seek, read (ms typical)
Average seek, write (ms typical)
Startup current (typical) 12V (peak)
Voltage tolerance (including noise)
ST3000NC002
ST3000NC000
2.0A (optional configuration through Smart Command Transport)
ST2000NC001
ST2000NC000
PIO modes 0–4
Multiword DMA modes 0–2
Ultra DMA modes 0–6
0.5 read
0.8 write
9.5
10.5
2.8A
5V: ± 5%
12V: ± 10%
ST1000NC001
ST1000NC000
Constellation CS Serial ATA Product Manual, Rev. C 4
www.seagate.com
Table 1 Drive specifications summary for 3TB, 2TB and 1TB models (Continued)
Drive Specification*
Temperature gradient (°C per hour max)
Relative humidity
Relative humidity gradient (per hour max) 30%
Altitude, operating
Altitude, non-operating
(below mean sea level, max)
Operational Shock (max @ 2 ms) Read 70 Gs / Write 40 Gs
Non-Operational Shock (max @ 2 ms)) 300 Gs 350 Gs
Vibration, operating
Vibration, non-operating
Drive acoustics, sound power (bels)
Idle**
Performance seek
Non-recoverable read errors 1 per 10
Annualized Failure Rate (AFR) 1.095% based on 8760 POH
Warranty
ST3000NC002
ST3000NC000
5–22 Hz: 0.25 Gs, Limited displacement
2.5 (typical)
2.6 (max)
2.5 (typical)
2.6 (max)
To determine the warranty for a specific drive, use a web browser to access the
following web page:
http://www.seagate.com/support/warranty-and-returns/
From this page, click on the “Verify Your Warranty” link. You will be asked to
provide the drive serial number, model number (or part number) and country of
purchase. The system will display the warranty information for your drive.
ST2000NC001
ST2000NC000
20°C (operating)
30°C (non-operating)
5% to 90% (operating)
5% to 95% (non-operating)
–304.80 m to 3048 m
(–1000 ft to 10,000+ ft)
–304.80 m to 12,192 m
(–1000 ft to 40,000+ ft)
22–350 Hz: 0.50 Gs
350–500 Hz: 0.25 Gs
5Hz to 22Hz: 3.0 Gs
22Hz to 350Hz: 3.0 Gs
350Hz to 500Hz: 3.0 Gs
2.4 (typical)
2.5 (max)
2.4 (typical)
2.5 (max)
14
bits read
ST1000NC001
ST1000NC000
2.2 (typical)
2.3 (max)
2.2 (typical)
2.3 (max)
Load/Unload cycles (25°C, 50% rel. humidity) 300,000
Supports Hotplug operation per the Serial ATA Rev. 3.0
specification
* 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.
** 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.
Yes
2.2 Formatted capacity
Model Formatted capacity* Guaranteed sectors Bytes per sector
ST3000NC002
ST3000NC000
ST2000NC001
ST2000NC000
ST1000NC001
ST1000NC000
*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.
3TB 5,860,533,168
2TB 3,907,029,168
1TB 1,953,525,168
(512 byte emulation)
4096
Constellation CS Serial ATA Product Manual, Rev. C 5
www.seagate.com
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 5.3.1, "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 Serial ATA (SATA)
Recording method Perpendicular
Recording density, KBPI (Kb/in max) 1807
Track density, KTPI (ktracks/in avg) 340
Areal density (Gb/in2 avg) 625
Spindle speed (RPM) (± 0.2%) 7200
Internal data transfer rate (Mb/s max) 2147
Sustained data transfer rate (MB/s) 150 to 180
I/O data-transfer rate (MB/s max) 600 (Ultra DMA mode 5)
2.5 Physical characteristics
Weight: (maximum)
3TB models 626g (1.38 lb)
2TB models 535g (1.18 lb)
1TB models 400g (0.88lb)
Cache buffer 64MB (64,768KB)
Constellation CS Serial ATA Product Manual, Rev. C 6
www.seagate.com
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 0.5 0.8
Average 9.5 10.5
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.
2.7 Start/stop times
3TB models 2TB models 1TB models
Power-on to ready (sec) 15 (max) 10 (max) 7.0 (max)
Standby to ready (sec) 15 (max) 10 (max) 7.0 (max)
Ready to spindle stop (sec) 20 (max)
2.8 Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. Refer to Figure 6 on page 23.
2.8.1 Power consumption
Power requirements for the drives are listed in Table 2:. Typical power measurements are based on an average of drives tested,
under nominal conditions, using 5.0V and 12.0V input voltage at 25°C ambient temperature.
• Spinup power
Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating speed.
• Seek mode
During seek mode, the read/write actuator arm moves toward a specific position on the disc surface and does not execute a
read or write operation. Servo electronics are active. Seek mode power represents the worst-case power consumption, using
only random seeks with read or write latency time. This mode is not typical and is provided for worst-case information.
• Read/write power and current
Read/write power is measured with the heads on track, based on a 16-sector write followed by a 32-ms delay, then a 16sector read followed by a 32-ms delay.
• Operating power and current
Operating power is measured using 40 percent random seeks, 40 percent read/write mode (1 write for each 10 reads) and
20 percent drive idle mode.
• Idle mode power
Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in a random track
location.
• Standby mode
During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/write electronics
are in power-down mode..
Constellation CS Serial ATA Product Manual, Rev. C 7
www.seagate.com
Table 2: 3TB Drive DC power requirements
3.0Gb mode 6.0Gb mode
Voltage
Regulation
Avg Idle Current *
+5V +12V +5V +12V
±5% ±5% ±5% ±5%
0.28 0.34 0.29 0.34
Advanced Idle Current *
Idle_A 0.17 0.34 0.18 0.34
Idle_B 0.15 0.30 0.16 0.30
Idle_C 0.15 0.19 0.16 0.19
Standby 0.12 0.01 0.13 0.01
Average Sleep Current
0.12 0.01 0.13 0.01
Maximum Start Current
DC (peak DC) 3σ 0.45 1.16 0.45 1.16
AC (peak DC) 3σ 0.68 1.94 0.70 1.95
Delayed Motor Start (DC max)
0.13 0.01 0.14 0.01
3σ
Peak operating current (random read):
Typical DC 0.31 0.52 0.32 0.52
Maximum DC 3σ 0.33 0.53 0.34 0.53
Maximum DC(peak) 3σ 1.83 1.56 1.80 1.56
Peak operating current (random write)
Typical DC 0.31 0.37 0.33 0.37
Maximum DC 3σ 0.33 0.38 0.34 0.39
Maximum DC(peak) 3σ 2.32 2.49 2.29 1.46
Peak operating current (sequential read)
Typical DC 0.61 0.37 0.62 0.37
Maximum DC 3σ 0.64 0.38 0.65 0.39
Maximum DC(peak) 3σ 1.20 2.24 1.19 1.84
Peak operating current (sequential write)
Typical DC 0.54 0.42 0.55 0.42
Maximum DC 3σ 0.57 0.43 0.58 0.43
Maximum DC(peak) 3σ 0.79 1.77 0.90 2.40
*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.
Constellation CS Serial ATA Product Manual, Rev. C 8
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