Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate Technology LLC
in the United States and/or other countries. Barracuda LP Series, SeaTools and SeaTDD are either trade
marks 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.
When referring to hard 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 measure
ment 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.
Barracuda LP Series SATA Product Manual, Rev. Aiii
1.0Introduction
This manual describes the functional, mechanical and interface specifications for the following Seagate
Barracuda
ST32000542ASST31500541ASST31000520AS
These drives provide the following key features:
• 5,900 RPM spindle speed.
• High instantaneous (burst) data-transfer rates (up to 300 Mbytes per second).
• Perpendicular recording, Tunneling Magnetoresistive (TMR) recording heads and EPRML technology, for
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.
• Quiet operation.
• Compliant with RoHS requirements in China and Europe.
• 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.
®
LP Series model drives:
Barracuda LP Series SATA Product Manual, Rev. A1
1.1About 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 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 International
Organization: Serial ATA Revision 2.6”. The specification can be downloaded from www.sata-io.org.
2Barracuda LP Series SATA Product Manual, Rev. A
2.0Drive 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:
ST32000542ASST31500541ASST31000520AS
Specification summary tables
The specifications listed in the following tables are for quick reference. For details on specification measurement or definition, see the appropriate section of this manual.
Barracuda LP Series SATA Product Manual, Rev. A3
Table 1: Drive specifications summary for 2000 and 1500 Gbyte models
WarrantyTo determine the warranty for a specific drive, use a web browser to access the following
Contact start-stop cycles50,000 at 25°C, 50% rel. humidity
Supports Hotplug operation per the
Serial ATA Revision 2.5 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.
350–500 Hz: 0.25 Gs
350–500 Hz: 2.0 Gs
2.6 bels (max)
2.8 bels (max)
14
bits read
web page:
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.
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
Formatted
capacity*
Guaranteed
sectors
Bytes per sector
512ST31500541AS1500 Gbytes2,930,277,168
2.1.1LBA 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.
2.2Default 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.
2.3Recording and interface technology
InterfaceSerial ATA (SATA)
Recording methodPerpendicular
Recording density (kbits/inch max)1417 kbits/in max
Track density (ktracks/inch avg)236 ktracks/in avg
Areal density (Gbits/inch2 avg)341.5 Gbits/in2 avg
Spindle speed (RPM)5,900 +/- 0.2%
Internal data transfer rate (Mbits/sec max)1285 Mbits/sec max
Sustained data transfer rate (Mbytes/sec max)95 Mbytes/sec max
Access time 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 access time is an average of all possible single-track seeks in both directions.
• Average access time is a true statistical random average of at least 5,000 measurements of seeks between
random tracks, less overhead.
Typical access times (msec)Read Write
Track-to-track<1.0<1.2
Average<16.0<16.0
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.
2.6Start/stop times
2000 and 1500 GB models1000 GB models
Power-on to Ready (sec)<13.0 (typical)<8.0 (typical)
Standby to Ready (sec)<8.0 (typical)<6.0 (typical)
Ready to spindle stop (sec)10 (max)
Barracuda LP Series SATA Product Manual, Rev. A7
2.7Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 4 on page 20.
2.7.1Power consumption
Power requirements for the drives are listed in the table on page 9. 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.
• 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-msec
delay, then a 16-sector read followed by a 32-msec 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.
8Barracuda LP Series SATA Product Manual, Rev. A
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