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.
For information regarding products and services, visit http://www.seagate.com/www/en-us/about/contact_us/
Available services include:
Presales & Technical support
Global Support Services telephone numbers & business hours
Authorized Service Centers
For information regarding Warranty Support, visit
http://www.sea
For information regarding Data Recovery Services, visit http://www.i365.com
For Seagate OEM & Distribution partner portal, visit https://direct.seagate.com/portal/system
For Seagate reseller portal, visit http://spp.seagate.com
• High instantaneous (burst) data-transfer rates (up to 3Gb/s).
• 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 th e
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.
• Worldwide Name (WWN) capability uniquely identifies the drive.
2Momentus Product Manual, Rev. B
2.1About the Serial ATA interface
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 op tio ns .
• 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 AT A ho st 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.
Momentus Product Manual, Rev. B3
3.0Drive specifications
Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal
power.
3.1Specification summary table
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 for 750, 640 and 500 GB models
ST9640424AS
ST9750423AS
Drive specification
Formatted GB750640750500
Guaranteed sectors1,465,149,1681,250,263,7281,465,149,168976,773,168
Bytes per sector (logical/physical)512/4K
Physical read/write heads44/3
Discs2
Cache (MB)16
Recording density in BPI (max)1,586k
Track density TPI (tracks/inch max)341k
Areal density (Gb/in
Spindle speed (RPM)54007200
Average latency (ms)5.64.2
Internal transfer rate (Gb/s max)113095013051305
I/O data transfer rate (Gb/s max)3.0
ATA data-transfer modes supportedSATA 1.0, Serial ATA Revision 2.6
Height9.5 +/- 0.2 mm (0.370 +/-.008 in)
Width69.85 +/- 0.25 mm (2.750 +/- 0.010 in)
Length100.35 +0.20 / -0.25 mm (3.951 +0.008 / -0.010 in)
Weight115 g (0.254 lb)
Power-on to ready (sec typical)3.64.0
Standby to ready (sec typical)2.53.0
Track-to-track seek time, read (ms typ)1.5
Average seek, read (ms typical)11.0
Average seek, write (ms typical)13.0
Startup current, +5V (max)1.0A
Seek power (typical)1.9W2.5W
Read power (typical)1.6W2.1W
Table 1: Drive specifications for 750, 640 and 500 GB models
ST9640424AS
ST9750423AS
Drive specification
Write power (typical)1.85W2.4W
Idle mode, low power (typical)0.55W0.70W
Standby mode (typical)0.15W ***
Sleep mode (typical)0.15W ***
Voltage tolerance (including noise)+5V ± 5%
Ambient temperature 0°C to 60°C (operating)
Temperature gradient (°C/hour max)20°C (operating), 35°C (nonoperating)
Relative humidity5% to 95% (operating and nonoperating)
Relative humidity gradient30% per hour max
Wet bulb temperature (°C max)37.7 °C (operating), 40 °C (nonoperating)
Altitude, operating–304.8 m to 3,048 m (–1,000 ft to 10,000
Altitude, nonoperating
(meters below mean sea level, max)
Shock, operating (Gs max at 2 ms)350
Shock, nonoperating (Gs max at 2 ms)800
Shock, nonoperating (Gs max at 1 msec) 1000
Shock, nonoperating (Gs max at 0.5 ms) 1000
Vibration, operating2.0 G (0 to peak, 5–200 Hz)
Vibration, nonoperating5 Gs (0 to peak, 5–500 Hz)
Drive acoustics, sound power (bels)
Idle**2.3 (typical)
WarrantyTo determine the warranty for a specific drive, use a web browser to access the following
Supports Hotplug operation per
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 incr ease 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.
ST9750423ASG
–40°C to 70°C (nonoperating)
–304.8 m to 12,192 m (–1000 ft to 40,000
1.0 G (0 to peak, 200–500 Hz)
2.5 (max)
2.7 (max)
14
bits read
600,000 software-controlled power on/off cycles
50,000 hard power on/off cycles
600,000 software-controlled power on/off cycles
50,000 hard power on/off cycles
web page: http://www.seagate.com/www/en-us/support/warranty_&_returns_assistance
From this page, click on the “Verify Your Warranty” link. Y ou 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.
Yes (requires COMRESET from host after a hotplug event)
ST9640423AS
ST9640423ASG
ST9750422AS
ST9750420AS
ST9750420ASG
+ ft)
+ ft)
ST9500424AS
ST9500423AS
ST9500423ASG
Momentus Product Manual, Rev. B5
3.2Formatted capacity
ModelForma tte d capacity*Guara nteed sectors
ST9750423AS, ST9750423ASG,
ST9750422AS, ST9750420AS and
ST9750420ASG
9640423ASG
ST
ST9500424AS, ST9500423AS and
9500423ASG
ST
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
750GB1,465,149,168
640GB1,250,263,728
500GB976,773,168
Bytes per sector
ical)
(log
512 ST9640424AS, ST9640423AS and
3.2.1LBA 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 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.
3.3Default logical geometry
CylindersRead/write headsSectors per track
16,3831663
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.
3.4Physical organization
Drive modelRead/write headsNumber of discs
ST9750423AS, ST9750423ASG, ST9750422AS,
ST9750420AS and ST9750420ASG
ST9640424AS, ST9640423AS and ST9640423ASG
ST9500424AS, ST9500423AS and ST9500423ASG4/3
4
2
6Momentus Product Manual, Rev. B
3.5Recording and interface technology
InterfaceSerial ATA (SATA)
Recording methodPerpendicular
Recording density BPI (bits/in max)1,586k
Track density TPI (tracks/in max)341k
Areal density (Gb/in2 max)541
Spindle speed (RPM) (± 0.2%)
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
• Average seek time is a true statistical random aver age
random tracks, less overhead.
Table 2: Typical seek times
Typical seek times (ms)Read
Track-to-track1.5
Average11.0
possible single-track seeks in both directions.
of at least 5000 measurements of seeks between
Full-stroke (ST9750423AS, ST9750423ASG, ST9640424AS,
ST9640423AS and ST9640423ASG models only)
Full-stroke (all other models)22.0
Average latency (ST9750423AS, ST9750423ASG, ST9640424AS,
9640423AS and ST9640423ASG models only)
ST
Average latency (all other models)4.2
27.0
5.6
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.
3.8Start/stop times
ST9750423AS, ST9750423ASG,
ST9640424AS, ST9640423AS
and ST9640423ASG,
Time to readyT ypical
Power-on to Ready (sec)3.65.14.05.5
Standby to Ready (sec)2.54.03.04.5
Max @ 25
°C
ST9750422AS, ST9750420AS,
ST9750420ASG, ST9500424AS,
ST9500423AS and ST9500423ASG
Typical
Max @ 25°C
8Momentus Product Manual, Rev. B
Loading...
+ 30 hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.