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in the United States and/or other countries. Barracuda, SeaTools and SeaTDD are either trademarks or
registered trademarks of Seagate Technology LLC or one of its affiliated companies in the United States
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owners.
One gigabyte, or GB, equals one billion bytes when referring to hard drive capacity. Accessible capacity
may vary depending on operating environment and formatting. Quantitative usage examples for various
applications are for illustrative purposes. Actual quantities will vary based on various factors, including file
size, file format, features and application software. Seagate reserves the right to change, without notice,
product offerings or specifications.
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
1
1.0Introduction
This manual describes the functional, mechanical and interface specifications for the following Seagate
Barracuda® 7200.8 Serial ATA model drives:
Barracuda 7200.8 Serial ATA
• ST3400832AS
• ST3400632AS
• ST3300831AS
• ST3300631AS
• ST3250823AS
• ST3250623AS
• ST3200826AS
These drives provide the following key features:
• 7,200 RPM spindle speed.
• 8 Mbyte buffer (ST3400832AS, ST3300831AS, ST3250823AS, and ST3200826AS models).
• 16 Mbyte buffer (ST3400632AS, ST3300631AS, and ST3250623AS models).
• High instantaneous (burst) data-transfer rates (up to 150 Mbytes per second).
• Tunneling Magnetoresistive (TMR) recording heads provide 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.
• Quiet operation.
• 300 Gs nonoperating shock.
• 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.
2
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
1.1About the Serial A TA 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 transiti o n from pa rallel ATA easy by providing legacy software suppo rt. Seri al
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 cont ai ns a set of registe rs that sha dow the conte nt s of the trad iti onal device r egisters, 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 www.serialata.org.
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
3
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
ST3400832AS, ST3400632AS, ST3300831AS, ST3300631AS, ST3250823AS, ST3250623AS and
ST3200826AS models.
2.1Specification summary tables
The specifications listed in tables 1, 2, and 3 are for quick reference. For details on specification measurement
or definition, see the appropriate section of this manual.
4
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
Table 1: Drive specifications for 400 Gbyte models
Drive specificationST3400832ASST3400632AS
Formatted Gbytes (512 bytes/sector)*400
Guaranteed sectors781,422,768
Bytes per sector512
Default sectors per track63
Default read/write heads16
Default cylinders16,383
Recording density in BPI (bits/inch max)763,000
Track density TPI (tracks/inch avg)120,000
2
Areal density (Mbits/inch
Spindle speed (RPM)7,200
Internal data transfer rate (Mbytes/sec max)95
Sustained transfer rate OD (Mbytes/sec)65
I/O data transfer rate (Mbytes/sec max)150
avg)91,560
ATA data-transfer modes supportedPIO modes 0–4
SATA data-transfer modes supported1.5 Gbits/sec
Cache buffer 8 Mbytes16 Mbytes
Height (max)26.11 mm (1.028 inches)
Width (max)101.85 mm (4.010 inches)
Length (max)146.99 mm (5.787 inches)
Weight (max) grams / lb.635 / 1.39
Average latency (msec)4.16
Power-on to ready (typical)10 sec
St andby to ready (typical)10 sec
Track-to-track seek time (msec typical)0.8 (read), 1.0 (write)
Average seek, read (msec typical)8.0
Average seek, write (msec typical)9.0
St artup current (typical) 12V (peak)2.8 amps
Voltage tolerance
(including noise)
Ambient temperature 0° to 60°C (op.)
Multiword DMA modes 0–2
Ultra DMA modes 0–6
5V ± 5%
12V ± 10%
–40° to 70°C (nonop.)
Temperature gradient
(°C per hour max)
Relative humidity5% to 90% (operating)
Relative humidity gradient30% per hour max
20°C (operating)
30°C (nonoperating)
5% to 95% (nonoperating)
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
5
Table 1: Drive specifications for 400 Gbyte models
Drive specificationST3400832ASST3400632AS
Wet bulb temperature
(°C max)
37.7 (operating)
40.0 (nonoperating)
Altitude, operating–60.96 m to 3,048 m
Altitude, nonoperating
(meters below mean sea level, max)
(–200 ft to 10,000
–60.96 m to 12,192 m
(–200 ft to 40,000
+ ft)
+ ft)
Shock, operating (max at 2 msec)63 Gs
Shock, nonoperating (max at 2 msec)300 Gs
Vibration, operating5–22 Hz: Limited displacement
Drive acoustics, sound power (bels)
Idle**2.8 (typical)
3.4 (max)
Performance seek3.7 (typical)
3.9 (max)
Nonrecoverable read errors1 per 10
14
bits read
Annualized Failure Rate (AFR)0.34%
Service life5 Years
Warranty5 years on distribution units.
To determine the warranty for a specific drive,
use a web browser to access the following web
page:
www.seagate.com/support/service/
From this page, click on the “Verify Your War-
ranty” 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.
Contact start-stop cycles
50,000
(25°C, 50% relative humidity)
Supports Hotplug operation per SATA II specificationYes
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
**During period s of driv e idle, some offline activity may occu r ac cor ding to th e S. M.A .R.T. s pe cif icati on, whi ch ma y in crease acoustic and
power to operational levels.
6
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
Table 2: Drive specifications for 300 Gbyte models
Drive specificationST3300831ASST3300631AS
Formatted Gbytes (512 bytes/sector)*300
Guaranteed sectors586,072,368
Bytes per sector512
Default sectors per track63
Default read/write heads16
Default cylinders16,383
Recording density in BPI (bits/inch max)763,000
Track density TPI (tracks/inch avg)120,000
Areal density (Mbits/inch2 avg)91,560
Spindle speed (RPM)7,200
Internal data transfer rate (Mbytes/sec max)95
Sustained transfer rate OD (Mbytes/sec)65
I/O data transfer rate (Mbytes/sec max)150
ATA data-transfer modes supportedPIO modes 0–4
SATA data-transfer modes supported1.5 Gbits/sec
Cache buffer 8 Mbytes16 Mbytes
Height (max)26.11 mm (1.028 inches)
Multiword DMA modes 0–2
Ultra DMA modes 0–6
Width (max)101.85 mm (4.010 inches)
Length (max)146.99 mm (5.787 inches)
Weight (max) grams / lb.635 / 1.39
Average latency (msec)4.16
Power-on to ready (typical)10 sec
St andby to ready (typical)10 sec
Track-to-t r a ck seek time ( ms e c typical)0.8 (read), 1.0 (write)
Average seek, read (msec typical)8.0
Average seek, write (msec typical)9.0
St artup current (typical) 12V (peak)2.8 amps
Voltage tolerance
(including noise)
Ambient temperature 0° to 60°C (op.)
Temperature gradient
(°C per hour max)
Relative humidity5% to 90% (operating)
Relative humidity gradient30% per hour max
5V ± 5%
12V ± 10%
–40° to 70°C (nonop.)
20°C (operating)
30°C (nonoperating)
5% to 95% (nonoperating)
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
7
Table 2: Drive specifications for 300 Gbyte models
Drive specificationST3300831ASST3300631AS
Wet bulb temperature
(°C max)
37.7 (operating)
40.0 (nonoperating)
Altitude, operating–60.96 m to 3,048 m
(–200 ft to 10,000+ ft)
Altitude, nonoperating
(meters below mean sea level, max)
–60.96 m to 12,192 m
(–200 ft to 40,000+ ft)
Shock, operating (max at 2 msec)63 Gs
Shock, nonoperating (max at 2 msec)300 Gs
Vibration, operating5–22 Hz: Limited displacement
Drive acoustics, sound power (bels)
Idle**2.8 (typical)
3.4 (max)
Performance seek3.7 (typical)
3.9 (max)
Nonrecoverable read errors1 per 10
14
bits read
Annualized Failure Rate (AFR)0.34%
Service life5 Years
Warranty5 years on distribution units.
To determine the warranty for a specific drive, use a web
browser to access the following web page:
www.seagate.com/support/service/
From this page, click on t he “Verify Your W arranty” link. You
will be asked to provide the drive serial number, model
number (or part number) and country of purc hase. T he s ystem will display the warranty information for your drive.
Contact start-stop cycles
50,000
(25°C, 50% relative humidity)
Supports Hotplug operation per SATA II specificationYes
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
**During period s of driv e idle, some offline activity may occu r ac cor ding to th e S. M.A .R.T. s pe cif icati on, whi ch ma y in crease acoustic and
power to operational levels.
8
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
Table 3: Drive specifications for 250 and 200 Gbyte models
Formatted Gbytes (512 bytes/sector)*250200
Guaranteed sectors488,397,168390,721,968
Bytes per sector512
Default sectors per track63
Default read/write heads16
Default cylinders16,383
Recording density in BPI (bits/inch max)763,000
Track density TPI (tracks/inch avg)120,000
Areal density (Mbits/inch2 avg)91,560
Spindle speed (RPM)7,200
Internal data transfer rate (Mbytes/sec max)95
Sustained transfer rate OD (Mbytes/sec)65
I/O data transfer rate (Mbytes/sec max)150
ATA data-transfer modes supportedPIO modes 0–4
SATA data-transfer modes supported1.5 Gbits /sec
Cache buffer 8 Mbytes16 Mbytes8 Mbytes
Height (max)26.11 mm (1.028 inches)
Multiword DMA modes 0–2
Ultra DMA modes 0–6
Width (max)101.85 mm (4.010 inches)
Length (max)146.99 mm (5.787 inches)
Weight (max) grams / lb.635 / 1.39
Average latency (msec)4.16
Power-on to ready (typical)10 sec
St andby to ready (typical)10 sec
Track-to-t r a ck seek time ( ms e c typical)0.8 (read), 1.0 (write)
Average seek, read (msec typical)8.0
Average seek, write (msec typical)9.0
St artup current (typical) 12V (peak)2.8 amps
Voltage tolerance
(including noise)
Ambient temperature 0° to 60°C (op.)
Temperature gradient
(°C per hour max)
Relative humidity5% to 90% (operating)
Relative humidity gradient30% per hour max
5V ± 5%
12V ± 10%
–40° to 70°C (nonop.)
20°C (operating)
30°C (nonoperating)
5% to 95% (nonoperating)
Barracuda 7200.8 Serial ATA Product Manual, Rev. F
9
Table 3: Drive specifications for 250 and 200 Gbyte models
Drive acoustics, sound power (bels)
Idle**2.8 (typical)
3.4 (max)
Performance seek3.7 (typical)
3.9 (max)
Nonrecoverable read errors1 per 10
14
bits read
Annualized Failure Rate (AFR)0.34%
Service life5 Years
Warranty5 years on distribution units.
To determine the warranty for a specific drive, use a web browser
to access the following web page:
www.seagate.com/support/service/
From this page, click on the “V erify 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.
Contact start-stop cycles
50,000
(25°C, 50% relative humidity)
Supports Hotplug operation per SATA II specification Yes
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
**During period s of driv e idle, some offline activity may occu r ac cor ding to th e S. M.A .R.T. s pe cif icati on, whi ch ma y in crease acoustic and
power to operational levels.
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