August 2007
Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate Technology LLC
in the United States and/or other countries. DB35 Series, SeaTools and SeaTDD 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.
One gigabyte, or GB, equals one billion bytes when referring to hard drive capacity. Accessible capacity
may vary depending on oper ating envi ronme nt and for matting. Seagate reserves the right to chan ge, wi thout notice, product offerings or specifications.
• 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.
• 300 Gs nonoperating shock.
• Support for S.M.A.R.T. drive monitoring and reporting.
• SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
• Supports latching SATA cables and connectors.
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DB35 Serial ATA Product Manual, Rev. E
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 transi tio n from pa rall el ATA eas y 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 cont ai ns a set of registe rs that sha dow the conte nts of the traditional 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.
DB35 Serial ATA Product Manual, Rev. E
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
ST3400832SCE, ST3300831SCE, ST3250823SCE and ST3200826SCE models.
2.1Specification 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.
Formatted Gbytes (512 bytes/sector)*400300250200
Guaranteed sectors781,422,768586,072,368488,397,168390,721,968
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 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)17.0 sec
St andby to ready (typical)16.0 sec
Track-to-t r a ck seek time ( ms e c typical)0.8 (read), 1.0 (write)
Average seek (msec typical)18 (read), 20 (write)
St artup current (typical) 12V (peak)2.0 amps
Seek power (typical)8.6 watts
Operating (Consumer Storage Profile)7.2 watts
Idle mode (typical)6.9 watts
St andby mode (typical)0.80 watts
Sleep mode (typical)0.80 watts
Voltage tolerance
(including noise)
Ambient temperature 0° to 60°C (operating)
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 (nonoperating)
20°C (operating)
30°C (nonoperating)
5% to 95% (nonoperating)
Wet bulb temperature
(°C max)
Altitude, operating–60.96 m to 3,048 m
Altitude, nonoperating
(meters below mean sea level, max)
Shock, operating (max at 2 msec)63 Gs
Shock, nonoperating (max at 2 msec)300 Gs
Vibration, operating0.25 G acceleration
Vibration, nonoperating0.25 G (5–22 Hz)
Drive acoustics, sound power (bels)
Idle** (bels)2.6 (typical)
Operational (bels)2.8 (typical)
Nonrecoverable read errors1 per 10
Annualized Failure Rate (AFR)0.34%
Service life5 Years
Contact start-stop cycles
Supports Hotplug operation per SATA II
specification
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
**Dur ing per io ds of driv e idle, some offline activity may occur accor di ng to the S.M.A.R. T . speci ficati on , whi ch may i ncrea se ac oustic an d
power to operational levels.
Yes
2.2Formatted ca pacity
ModelFormatted capacity*Guaranteed sectors Bytes per sector
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
2.2.1LBA 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 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.
2.3Default logi cal geometr y
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.
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DB35 Serial ATA Product Manual, Rev. E
2.4Recording and interf ac e technology
InterfaceSerial ATA (SATA)
Recording method16/17 EPRML
Recording density BPI (bits/inch max)763,000
Track density TPI (tracks/inch avg)120,000
Areal density (Mbits/inch2 avg)91,560
Spindle speed (RPM) (± 0.2%)7,200
Internal data transfer rate (Mbytes/sec max)95
Sustained transfer rate OD (Mbytes/sec max)65.0
I/O data-transfer rate (Mbytes/sec max)150 (SATA 1.0)
Interleave1:1
Cache buffer8 Mbytes
2.5Physical characteristics
Maximum he i g ht
(mm)
(inches)
Maximum wid th
(mm)
(inches)
Maximum length
(mm)
(inches)
Maximum wei g h t
(grams)
(pounds)
26.11
1.028
101.85
4.010 +/- 0.010
146.99
5.787
635
1.39
2.6Seek time
Seek measurem ent s a re t ake n wi th nom inal po w er a t 25 °C amb ient temperature. All tim es a re m easu red using
drive diagnostics. The specifications in the table below are defined as follows:
• Track-to-track seek time is an average of all possible single-track seeks in both directions.
• Average seek time is a true statistical random average of at least 5,000 measurements of seeks between
random tracks, less overhead.
T yp ical seek times (msec)Read Write
Track-to-track0.81.0
Average1820
Average latency:4.164.16
Note.These drives ar e de si gned to consisten tl y me et t he se ek t imes r epr esente d in thi s manu al. P hysical
seeks, regardless of mode (such as track-to-track and average), are expected to meet or exceed
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.
DB35 Serial ATA Product Manual, Rev. E
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2.7Start/stop times
Power-on to Ready (sec)15.5 (max)
St andby to Ready (sec)14.0 (max)
Ready to spindle stop (sec)10 (max)
2.8Power specifications
The drive receives DC power (+5V and +12V) through a native SATA power connector. See Figure 5 on
page 19.
2.8.1Power consumption
Power requiremen ts fo r the drive s are listed i n the t able on pa ge 9. Typical power measurements are ba sed 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.
• Seek mode
During seek mode, the read/write actuator arm moves toward a specific position on the disc surface and
does not execute a read or write operation. Servo electronics are active. Seek mode power 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 worst-case information.
• Operating power and current
Operating power is measured using a standrad Consumer Storage Profile.
• Idle mode power
Idle mode power is measu red with the drive up to speed, with servo e le ctron ics acti ve and with the he ads i n
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.
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DB35 Serial ATA Product Manual, Rev. E
Table 2: DC power requirements
Power dissipation (typical)Average (watts, 25° C)5V typ amps12V typ amps