Product Manual
Momentus 7200.4 SATA
ST9500420AS |
ST9500420ASG |
ST9320423AS |
ST9320423ASG |
ST9250410AS |
ST9250410ASG |
ST9160412AS |
ST9160412ASG |
ST9120410AS |
ST9120410ASG |
ST980412AS |
ST980412ASG |
100534376 Rev. C November 2010
© 2010 Seagate Technology LLC. All rights reserved. Publication number: 100534376, Rev. C, November 2010
Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate Technology LLC in the United States and/or other countries. Momentus 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.
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. Seagate reserves the right to change, without notice, product offerings or specifications.
Contents
1.0 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 About the Serial ATA interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.0 Drive specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Specification summary table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Formatted capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.1 LBA mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 Default logical geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4 Physical organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.5 Recording and interface technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.6 Physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.7 Seek time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.8 Start/stop times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.9 Power specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.9.1 Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.9.2 Conducted noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.9.3 Voltage tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.9.4 Power-management modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.10 Environmental specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.10.1 Ambient temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.10.2 Temperature gradient. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.10.3 Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.10.4 Wet bulb temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.10.5 Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.10.6 Shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.10.7 Vibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.11 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.12 Electromagnetic immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.13 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.13.1 Free Fall Protection feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.14 Agency certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.14.1 Safety certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.14.2 Electromagnetic compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.14.3 FCC verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.15 Environmental protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.15.1 European Union Restriction of Hazardous Substances (RoHS) . . . . . . . . . . . . 17 2.15.2 China Restriction of Hazardous Substances (RoHS) Directive . . . . . . . . . . . . . 17
2.16 Corrosive environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.0 Configuring and mounting the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.1 Handling and static-discharge precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.2 Configuring the drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.3 Serial ATA cables and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.0 Serial ATA (SATA) interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.1 Hot-Plug compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.2 Serial ATA device plug connector pin definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.3 Supported ATA commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.3.1 Identify Device command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.3.2 Set Features command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.3.3 S.M.A.R.T. commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.0 Seagate Technology support services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Momentus 7200.4 SATA Product Manual, Rev. C |
i |
ii |
Momentus 7200.4 SATA Product Manual, Rev. C |
List of Figures
Figure 1. Typical +5V only startup and operation current profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 2. Serial ATA connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Figure 3. Attaching SATA cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Figure 4. Mounting dimensions—top, side and end view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Momentus 7200.4 SATA Product Manual, Rev. C |
iii |
This manual describes the functional, mechanical and interface specifications for the following Seagate Momentus® 7200.4 SATA model drives:
Standard models |
Free Fall Protection models |
|
|
ST9500420AS |
ST9500420ASG |
|
|
ST9320423AS |
ST9320423ASG |
|
|
ST9250410AS |
ST9250410ASG |
|
|
ST9160412AS |
ST9160412ASG |
|
|
ST9120410AS |
ST9120410ASG |
|
|
ST980412AS |
ST980412ASG |
|
|
These drives provide the following key features:
•7200-RPM spindle speed.
•16-Mbyte buffer.
•Free Fall Protection (on ST9500420ASG, ST9320423ASG, ST9250410ASG, ST9160412ASG, ST9120410ASG and ST980412ASG models only)
•Quiet operation. Fluid Dynamic Bearing (FDB) motor.
•High instantaneous (burst) data-transfer rates (up to 3.0 Gbits per second).
•Perpendicular recording technology.
•State-of-the-art cache and on-the-fly error-correction algorithms.
•Native Command Queuing (NCQ) with command ordering.
•Full-track multiple-sector transfer capability without local processor intervention.
•1000 Gs nonoperating shock and 350 Gs of operating shock.
•SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
•The 3D Defense System™, which includes Drive Defense, Data Defense and Diagnostic Defense, offers the industry’s most comprehensive protection for disc drives.
•Support for S.M.A.R.T. drive monitoring and reporting.
•Support for Read Multiple and Write Multiple commands.
Momentus 7200.4 SATA Product Manual, Rev. C |
1 |
The Serial ATA 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 normally 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, Serial ATA makes the transition from parallel ATA easy by providing legacy software support. Serial ATA was designed to allow you to install a Serial ATA host adapter and Serial ATA disc drive in your current system and expect all of your existing applications to work as normal.
The Serial ATA interface connects each disc drive in a point-to-point configuration with the Serial ATA host adapter. There is no master/slave relationship with Serial ATA devices like there is with parallel ATA. If two drives are attached on one Serial ATA 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.
Note. The host adapter may, optionally, emulate a master/slave environment to host software where two devices on separate Serial ATA 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 Serial ATA environment.
The Serial ATA 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 Serial ATA host adapter contains a set of registers that shadow the contents of the traditional device registers, referred to as the Shadow Register Block. All Serial ATA devices behave like Device 0 devices. For additional information about how Serial ATA emulates parallel ATA, refer to the “Serial ATA: High Speed Serialized AT Attachment” specification. The specification can be downloaded from http://www.serialata.org.
2 |
Momentus 7200.4 SATA Product Manual, Rev. C |
2.0Drive specifications
Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal power.
The specifications listed in this table are for quick reference. For details on specification measurement or definition, see the appropriate section of this manual.
Table 1: |
Drive specifications |
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
||
|
|
ST9500420AS |
ST9320423AS |
ST9250410AS |
ST9160412AS |
ST9120410AS |
ST980412AS |
||
Drive specification |
ST9500420ASG |
ST9320423ASG |
ST9250410ASG |
ST9160412ASG |
ST9120410ASG |
ST980412ASG |
|||
|
|
|
|
|
|
|
|
|
|
Formatted GB (512 bytes/sector)* |
500 |
|
320 |
250 |
|
160 |
120 |
80 |
|
|
|
|
|
|
|
|
|
|
|
Guaranteed sectors |
976,773,168 |
|
625,142,448 |
488,397,168 |
|
312,581,808 |
234,441,648 |
156,301,488 |
|
|
|
|
|
|
|
|
|
|
|
Bytes per sector |
512 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Physical read/write heads |
4 |
|
3/4 |
2 |
|
2 |
1/2 |
1 |
|
|
|
|
|
|
|
|
|
|
|
Discs |
|
2 |
|
2 |
1 |
|
1 |
1 |
1 |
|
|
|
|
|
|
|
|
|
|
Cache (Mbytes) |
16 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
Recording density in BPI (max) |
1490k |
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
||
Track density TPI (max) |
265k |
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
Areal density (Gb/in2 max) |
394 |
|
|
|
|
|
|
|
|
Spindle speed (RPM) |
7200 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Average latency (msec) |
4.17 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Internal transfer rate (Gb/s max) |
1.23 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
I/O data transfer rate (Gb/s max) |
3.0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
ATA data-transfer modes supported |
SATA 1.0, Serial ATA Revision 2.6 |
|
|
|
|||||
|
|
PIO modes 0–4 |
|
|
|
|
|
|
|
|
|
Multiword DMA modes 0–2 |
|
|
|
|
|
||
|
|
Ultra DMA modes 0–6 |
|
|
|
|
|
||
|
|
|
|
|
|
||||
Height (max) |
|
9.5 +/- 0.2 mm (0.370 +/- .008 in) |
|
|
|
||||
|
|
|
|
|
|
||||
Width (max) |
|
69.85 +/- 0.25 mm (2.750 +/- 0.010 in) |
|
|
|
||||
|
|
|
|
|
|
||||
Length (max) |
|
100.35 +0.20 / -0.25 mm (3.951 +0 .008 / -0.010 |
in) |
|
|
||||
|
|
|
|
|
|
|
|||
Weight (max) |
|
110 grams (0.238 lb) |
105 grams (0.227 lb) |
|
|
||||
|
|
|
|
|
|
|
|
|
|
Power-on to ready (sec typical) |
4.5 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Standby to ready (sec typical) |
3.0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Track-to-track seek time, read |
1.5 |
|
|
|
|
|
|
|
|
(ms typical) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Average seek, read (ms typical) |
11.0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Average seek, write (ms typical) |
13.0 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
Startup current, +5V (max) |
1.0 amps |
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
||
Seek power (typical) |
2.2 watts |
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
Momentus 7200.4 SATA Product Manual, Rev. C |
3 |
Table 1: |
Drive specifications |
|
|||||
|
|
|
|
|
|
|
|
|
|
ST9500420AS |
ST9320423AS |
ST9250410AS |
ST9160412AS |
ST9120410AS |
ST980412AS |
Drive specification |
ST9500420ASG |
ST9320423ASG |
ST9250410ASG |
ST9160412ASG |
ST9120410ASG |
ST980412ASG |
|
|
|
|
|
|
|
|
|
Read power (typical) |
2.1 watts |
|
|||||
|
|
|
|||||
Write power (typical) |
2.2 watts |
|
|||||
|
|
|
|||||
Idle mode, low power (typical) |
0.69 watts |
|
|||||
|
|
|
|
||||
Standby mode |
|
0.20 watts (typical)*** |
|
||||
|
|
|
|
||||
Sleep mode |
|
0.20 watts (typical)*** |
|
||||
|
|
|
|||||
Voltage tolerance (including noise) |
+5V ± 5% |
|
|||||
|
|
|
|||||
Ambient temperature |
0°C to 60°C (operating) |
|
|||||
|
|
–40°C to 70°C (nonoperating) |
|
||||
|
|
|
|||||
Temperature gradient |
20°C (operating), 35°C (nonoperating) |
|
|||||
(°C per hour max) |
|
|
|
|
|
|
|
|
|
|
|||||
Relative humidity |
5% to 95% (operating and nonoperating |
|
|||||
|
|
|
|||||
Relative humidity gradient |
30% per hour max |
|
|||||
|
|
|
|||||
Wet bulb temperature (°C max) |
37.7 (operating) |
|
|||||
|
|
40 (nonoperating) |
|
||||
|
|
|
|||||
Altitude, operating |
–304.8 m to 3048 m (–1000 ft to 10,000+ ft) |
|
|||||
Altitude, nonoperating |
–304.8 m to 12,192 m (–1000 ft to 40,000+ ft) |
|
|||||
(meters below mean sea level, max) |
|
|
|
|
|
|
|
Shock, operating (Gs max at 2 msec) |
350 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Shock, nonoperating |
800 |
|
|
|
|
|
|
(Gs max at 2 msec) |
|
|
|
|
|
|
|
Shock, nonoperating |
1,000 |
|
|
|
|
|
|
(Gs max at 1 msec) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Shock, nonoperating |
600 |
|
|
|
|
|
|
(Gs max at 0.5 msec) |
|
|
|
|
|
|
|
|
|
|
|||||
Vibration, operating |
1.0 G (0 to peak, 5–500 Hz) |
|
|||||
|
|
|
|||||
Vibration, nonoperating |
5 Gs (0 to peak, 5–500 Hz) |
|
|||||
|
|
|
|
|
|
|
|
Drive acoustics, sound power (bels) |
|
|
|
|
|
|
|
Idle** |
|
2.3 (typical) |
|
||||
|
|
2.5 (max) |
|
||||
Performance seek |
2.6 (typical) |
|
|||||
|
|
2.7 (max) |
|
||||
|
|
|
|||||
Nonrecoverable read errors |
1 per 1014 bits read |
|
|||||
Annualized Failure Rate (AFR) |
0.5% |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Load/Unload (U/UL) cycles |
|
|
|
|
|
|
|
25°C, 50% relative humidity |
600,000 software-controlled power on/off cycles |
|
|||||
|
|
50,000 hard power on/off cycles |
|
||||
32°C, 80% relative humidity |
600,000 software-controlled power on/off cycles |
|
|||||
5°C, 80% relative humidity |
50,000 hard power on/off cycles |
|
|||||
5°C, 10% relative humidity |
|
|
|
|
|
|
|
55°C, 16% relative humidity |
|
|
|
|
|
|
|
|
|
|
|
||||
Warranty |
|
For information regarding Warranty Support, visit |
|
||||
|
|
http://www.seagate.com/www/en-us/support/warranty_&_returns_assistance |
|
||||
|
|
|
|||||
Supports Hotplug operation per |
Yes (requires COMRESET from host after a hotplug event) |
|
|||||
Serial ATA Revision 2.6 specification |
|
|
|
|
|
|
*One Gbyte equals one billion 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.
***Typical notebooks will pull power to the drive when entering S3 and S4; while in the S3 and S4 states, drive sleep and drive standby modes will not contribute to battery power consumption.
4 |
Momentus 7200.4 SATA Product Manual, Rev. C |
Model |
Formatted capacity* |
Guaranteed sectors |
Bytes per sector |
|
|
|
|
ST9500420AS and ST9500420ASG |
500 Gbytes |
976,773,168 |
512 |
|
|
|
|
ST9320423AS and ST9320423ASG |
320 Gbytes |
625,142,448 |
512 |
|
|
|
|
ST9250410AS and ST9250410ASG |
250 Gbytes |
488,397,168 |
512 |
|
|
|
|
ST9160412AS and ST9160412ASG |
160 Gbytes |
312,581,808 |
512 |
|
|
|
|
ST9120410AS and ST9120410ASG |
120 Gbytes |
234,441,648 |
512 |
|
|
|
|
ST980412AS and ST980412ASG |
80 Gbytes |
156,301,488 |
512 |
|
|
|
|
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting.
2.2.1LBA 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 48bit addressing support of drives with capacities over 137 Gbytes.
Cylinders |
Read/write heads |
Sectors per track |
|
|
|
16,383 |
16 |
63 |
|
|
|
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.
Drive model |
Read/write heads |
Number of discs |
|
|
|
ST9500420AS and ST9500420ASG |
4 |
2 |
|
|
|
ST9320423AS and ST9320423ASG |
3/4 |
2 |
|
|
|
ST9250410AS and ST9250410ASG |
2 |
1 |
|
|
|
ST9160412AS and ST9160412ASG |
2 |
1 |
|
|
|
ST9120410AS and ST9120410ASG |
1/2 |
1 |
|
|
|
ST980412AS and ST980412ASG |
1 |
1 |
|
|
|
Momentus 7200.4 SATA Product Manual, Rev. C |
5 |
Interface |
Serial ATA (SATA) |
|
|
Recording method |
Perpendicular |
|
|
Recording density BPI (bits/inch max) |
1490k |
|
|
Track density TPI (tracks/inch max) |
265k |
|
|
Areal density (Gbits/inch2 max) |
394 |
Spindle speed (RPM) (± 0.2%) |
7200 |
|
|
Maximum Internal transfer rate (Gbits/sec) |
1.23 |
|
|
I/O data-transfer rate (Gbits/sec max) |
3.0 |
|
|
Interleave |
1:1 |
|
|
Cache buffer |
16 Mbytes (16,384 kbytes) |
|
|
Drive specification |
|
|
|
|
|
Height |
(mm) |
9.5 +/-0.2 |
|
(inches) |
0.370 +/-0.008 |
|
|
|
Width |
(mm) |
69.85 +/-0.25 |
|
(inches) |
2.750 +/-0.010 |
|
|
|
Length |
(mm) |
100.35 +0.20 / -0.25 |
|
(inches) |
3.951 +0.008 / -.010 |
Typical weight |
110 grams |
|
|
ST9500420AS |
|
|
ST9500420ASG |
0.238 pounds |
|
ST9320423AS |
|
|
ST9320423ASG |
|
|
ST9250410AS |
105 grams |
|
ST9250410ASG |
0.227 pounds |
|
ST9160412AS |
|
|
ST9160412ASG |
|
|
ST9120410AS |
|
|
ST9120410ASG |
|
|
ST980412AS |
|
|
ST980412ASG |
|
|
|
|
6 |
Momentus 7200.4 SATA Product Manual, Rev. C |
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.
Table 2: Typical seek times
Typical seek times (msec) |
Read |
|
|
Track-to-track |
1.5 |
|
|
Average |
11.0 |
|
|
Full-stroke |
22.0 |
|
|
Average latency |
4.17 |
|
|
Note. These drives are designed to consistently meet the seek times represented in this manual. Physical seeks, 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.
Time to ready |
Typical |
Max @ 25°C |
|
|
|
Power-on to Ready (sec) |
4.5 |
5.0 |
|
|
|
Standby to Ready (sec) |
3.0 |
3.5 |
|
|
|
Momentus 7200.4 SATA Product Manual, Rev. C |
7 |
The drive receives DC power (+5V) through a native SATA power connector.
Power requirements for the drives are listed in the table on page 8. Typical power measurements are based on an average of drives tested, under nominal conditions, 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 is measured based on three random seek operations every 100 msecs. This mode is not typical.
•Read/write power and current
Read/write power is measured with the heads on track, based on three 63 sector read or write operations every 100 msecs.
•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 model
Table 3: |
DC power |
|
|
|
|
Power dissipation |
+5V input average (25° C) |
|
|
|
|
Spinup (max) |
1.0 amps |
|
|
|
|
Seek |
|
2.2 watts |
|
|
|
Read |
|
2.1 watts |
|
|
|
Write |
|
2.2 watts |
|
|
|
Idle, performance* |
1.4 watts |
|
|
|
|
Idle, active* |
|
1.0 watts |
|
|
|
Idle, low power mode* |
0.69 watts |
|
|
|
|
Standby |
|
0.20 watts |
|
|
|
Sleep |
|
0.20 watts |
|
|
|
*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.
8 |
Momentus 7200.4 SATA Product Manual, Rev. C |