LLC in the United States and/or other countries. Momentus XT 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 megabyte, or
MB, equals one million 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 format
ting 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 6Gbs).
• Perpendicular recording technology.
• State-of-the-art cache and on-the-fly error-correction algorithms.
• Addition of NAND Flash memory to enhance drive performance.
• Native Command Queuing (NCQ) with command ordering.
• Full-track multiple-sector transfer capability without local processor intervention.
• 800 Gs nonoperating shock and 350 Gs of operating shock @ 2ms.
• SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
• Support for S.M.A.R.T. drive monitoring and reporting.
• Support for Read Multiple and Write Multiple commands.
2Momentus XT Product Manual, Rev. D
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 XT Product Manual, Rev. D3
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
Drive specificationST750LX003ST500LX003
Formatted GB (512 bytes/sector)*750500
Guaranteed sectors1,465,149,168976,773,168
Bytes per sector4K emulation @ 512
Physical read/write heads4
Discs2
Cache (MB)32
Recording density in BPI (bits/in max)1778k
Track density TPI (tracks/in max)317k
2
Areal density (Gb/in
Spindle speed (RPM)7200
Average latency (ms)4.20
Internal transfer rate (Gb/s max)1.23
I/O data transfer rate (Gb/s max)6.0
ATA data-transfer modes supportedSATA 1.0, Serial ATA Revision 2.6
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)100.30 ± 0.25 mm (3.949 ± 0.010 in)
Weight (max)115 g (0.253 lb)
Power-on to ready (sec typical)5.0
Standby to ready (sec typical)3.5
Track-to-track seek time, read (msec typical) 1.5
Average seek, read (ms typical)11.0
Average seek, write (ms typical)13.0
Startup current, +5V amps (max)1.2
Read power (watts typical)3.3
Write power (watts typical)3.2
Idle mode, low power (watts typical)1.1
Standby mode (watts typical)0.6 ***
Sleep mode (watts typical)0.6 ***
Voltage tolerance (including noise)+5V ± 5%
Ambient temperature (°C)0 to 60 (operating)
Temperature gradient (°C per hour max)20 (operating), 35 (nonoperating)
Relative humidity5% to 95% (operating and nonoperating
Relative humidity gradient30% per hour max
Wet bulb temperature (°C max)37.7 (operating)
Altitude, operating–304.8 m to 3048 m (–1000 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 ms)1000
Shock, nonoperating (Gs max at 0.5 ms)1000
Vibration, operating1.0 G (0 to peak, 5–500 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.
–40 to 70 (nonoperating)
40 (nonoperating)
+ ft)
–304.8 m to 12,192 m (–1000 ft to 40,000
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. 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.
Yes (requires COMRESET from host after a hotplug event)
+ ft)
Momentus XT Product Manual, Rev. D5
3.2Formatted capacity
ModelFormatted capacity*Guaranteed sectors Bytes per sector
*One GB equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
4K emulated @ 512
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.
3.2.2Solid State Hybrid feature
The Solid State Hybrid feature utilizes the addition o
f NAND Flash memory to enhance the performance of the
drive. Short random accesses to the NAND Flash are faster than disc accesses due to the elimination of seek
and rotational latencies and therefore it is used to store more frequently accessed data. The Momentus XT
uses a proprietary algorithm whic h monitors dr ive activity a nd determine s the optimu m data to maintain in the
NAND Flash for peak respons iveness. The Solid State Hybrid feature is self contained in the drive firm ware
and functions independent of the host hardware or operating system. There are no special host system
requirements. Momentus XT can be installed in any standard SATA environment and will automatically optimize.
Specifics of the Solid State Hybrid Feature:
• Powerful ECC correction on data read from the NAND Flash.
• Maintains a list of defective NAND Flash blocks and maps them out of use.
• Additional bad blocks added during
• Storage functionality is preserved with no dat
use will be added to the list of defective blocks and taken out of use.
a loss with any wear out of the NAND Flash.
• No user intervention required.
6Momentus XT Product Manual, Rev. D
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
750GB
500GB
42
3.5Recording and interface technology
InterfaceSerial ATA (SATA)
Recording methodPerpendicular
Recording density BPI (bits/in max)1778k
Track density TPI (tracks/in max)317k
Areal density (Gb/in2 max)563.6
Spindle speed (RPM) (± 0.2%)7200
Maximum Internal transfer rate (Gb/s)1.23
I/O data-transfer rate (Gb/s max)6.0
Interleave1:1
Cache buffer - ST750LX003 and ST500LX00332MB (32,768KB)
3.6Physical characteristics
Drive specification
Height(mm)
(in)
Width(mm)
(in)
Length(mm)
(in)
Typical weight115 g
9.50 ± 0.20
0.370 ± 0.008
69.85 ± 0.25
2.750 ± 0.010
± 0.25
100.30
3.949
± 0.010
0.253 lb
Momentus XT Product Manual, Rev. D7
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