States and/or other countries. Barracuda, SeaTools and SeaTDD are either trademarks or registered trademarks of Sea
gate 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 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 stor
age. Seagate reserves the right to change, without notice, product offerings or specifications.
Barracuda XT Series SATA Product Manual, Rev. C iii
ivBarracuda XT Series SATA Product Manual, Rev. C
1.0Introduction
This manual describes the functional, mechanical and interface specifications for the following Seagate
Barracuda
ST32000641AS
These drives provide the following key features:
• The SATA 6Gb/s interface enables the use of the industry’s newest and fastest hard drive controllers while providing
backward compatibility to legacy SATA 1.5Gb/s or 3Gb/s systems.
• 7,200 RPM spindle speed.
• 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.
• 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.
®
XT model drives:
Barracuda XT Series SATA Product Manual, Rev. C 1
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 pr oviding legacy so ftware support. Serial ATA was
designed to allow you to install a Serial ATA host adapter and Serial ATA disk drive in your current system and expect all
of your existing applications to work as normal.
The Serial ATA interface connects each disk drive in a point-to-p oint configuratio n with the Serial ATA host adap ter. There
is no master/slave relationship with Serial ATA devices like there is with parallel ATA. If two drives are attached on on e
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 addr esses. 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 a ddi tional in form ation
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 XT Series SATA Product Manual, Rev. C
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:
ST32000641AS
The specification summaries listed in the following tables are for quick refe rence. For details on specification measur e-
ment or definition, see the appropriate section of this manual.
Table 1: Drive specifications summary for 2000GB models
Drive specificationST32000641AS
Formatted capacity (512 bytes/sector)*2000GB
Guaranteed sectors3,907,029,168
Heads8
Disks4
Bytes per sector512
Default sectors per track63
Default read/write heads16
Default cylinders16,383
Recording density1421 kb/in
Track density(avg)240 ktracks/in
Areal density (avg)347Gb/in
Spindle speed7200 RPM
Internal data transfer rate (max)1300Mb/s
Sustained data transfer rate OD(max)138MB/s
I/O data-transfer rate (max)600MB/s
ATA data-transfer modes supportedPIO modes: 0 to 4
Multiword DMA modes: 0 to 2
Ultra DMA modes 0 to 6
Cache buffer64MB
Height (max)26.1mm / 1.028 in
Width (max)101.85mm / 4.010 in
Length (max)146.99mm / 5.787 in
Weight (typical)700g / 1.543 lb
Average latency4.16ms
Power-on to ready (typical)15s
Standby to ready (typical)15s
Startup current (typical) 12V (peak)2.8A
2
Barracuda XT Series SATA Product Manual, Rev. C 3
Drive specificationST32000641AS
Voltage tolerance (including noise)5V + 5%
Operating temperature
(Drive Case temperature)
Nonoperating temperature (Ambient)–40° to 70°C
Temperature gradient (max)20°C per hour max (operating)
Relative humidity5% to 95% (operating)
Relative humidity gradient (max)30% per hour
Wet bulb temperature (max)37.7°C max (operating)
Altitude, operating–60.96m to 3,048m
Altitude, nonoperating
(below mean sea level, max)
Operational Shock (max)63 Gs at 2ms
Non-Operational Shock (max)300 Gs at 2ms
Vibration, operating5 to 350Hz: 0.50 Gs
Vibration, nonoperating5 to 350Hz: 5.0 Gs
Drive acoustics, sound power
Idle**2.7 bels (typical)
Performance2.9 bels (typical)
Nonrecoverable read errors1 per 10
WarrantyTo determine the warranty for a specific drive, use a web browser to access the following web
Load-unload cycles300,000 at 25°C, 50% rel. humidity
Supports Hotplug operation per the
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 war
ranty information for your drive.
Yes
-
*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.
4Barracuda XT Series SATA Product Manual, Rev. C
2.1Formatted capacity
Model
ST32000641AS2000GB3,907,029,168512
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depe nding on operating environment and
formatting.
Formatted
capacity*
Guaranteed
sectors
Bytes per sector
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 info rmation about 48 -bit address-
ing support of drives with capacities over 137GB.
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)1421kb/in
Track density (ktracks/inch avg)240 ktracks/in
2
Areal density (Gbits/inch
Spindle speed (RPM)7200 + 0.2%
Internal data transfer rate (Mb/s max)1300Mb/s
Sustained data transfer rate (MB/s max)138MB/s
I/O data-transfer rate (MB/s max)600MB/s
avg)347Gb/in
2
Barracuda XT Series SATA Product Manual, Rev. C 5
2.4Physical characteristics
ST32000641AS
Maximum height26.1mm / 1.028 in
Maximum width101.85mm / 4.010 in
Maximum length146.99mm / 5.787 in
Typical weight700g / 1.543 lb
Cache buffer64 MB (6 4,768kb)
2.5Start/stop times
Power-on to ready (s) max.15.0
Standby to ready (s) max.15.0
Ready to spindle stop (s) max.20.0
2000GB model
6Barracuda XT Series SATA Product Manual, Rev. C
2.6Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 1 on page 17.
2.6.1Power consumption
Power requirements for the drives are listed in the table on page 9. Typical power measurements are based on an avera
ge of drives tested, under nominal conditions, using 5.0V and 12.0V input voltage at 25°C ambient temperature.
• Spinup power
Spinup power is me asured from the time of power-on to th
• Seek mode
During seek mode, the read/write actuator a rm moves towar d a
cute a read or write operation. Servo electronics ar e active. Seek mode powe r 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 worstcase information.
• Read/write power and current
Read/write power is measured with the head
s on track, based on a 16-sector write followed by a 32-ms delay, then a
16-sector 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)
nd 20 percent drive idle mode.
a
e time that the drive spindle reaches operating speed.
specific position on the disk surface and does not exe-
• 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 n
ot spinning, and the servo and read/write elec-
tronics are in power-down mode.
Table 2: DC power requirements
Power dissipation Avg (watts 25° C )Avg 5V typ ampsAvg 12V typ amps