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.
• 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.
• Supports S.M.A.R.T. Command Transport (SCT) to provide enterprise-like features in an industry-accepted
transport mechanism. See Section 4.3.3.1 for additional information about SCT.
• Supports the Write Same command to allow large writes without host interface overhead.
• Supports Error Recovery Control to allow the host to put a soft time limit on read and write commands.
• One-Step Microcode Download which allows enterprise clients to download new drive code with a single
download command using the host download utility.
• Workload management features to manage drive temperature and activity. This optimizes drive reliability in
nearline environments with no user intervention required.
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NL35 Series SATA Product Manual, Rev. B
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 transit io n from pa rallel 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 operatin g 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.
NL35 Series SATA Product Manual, Rev. B
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
ST3400832NS, ST3250823NS, ST3400632NS, and ST3250623NS models.
2.1Specification summary tables
The specifications listed in table 1 are for quick reference. For details on specification measurement or definition, see the appropriate section of this manual.
Drive acoustics, sound power (bels)
Idle*2.8 (typical)
Performance seek3.7 (typical)
Nonrecoverable read errors1 per 10
20°C (operating)
30°C (nonoperating)
5% to 95% (nonoperating)
37.7 (operating)
40.0 (nonoperating)
(–200 ft to 10,000
–60.96 m to 12,192 m
(–200 ft to 40,000
23–350 Hz: 0.5 G acceleration
23–350 Hz: 5 Gs acceleration
3.4 (max)
3.9 (max)
14
+ ft)
+ ft)
bits read
MTBF (Mean Time Before Failure)1,000,000 hours
Service life5 Years
Warranty5 years on distribution units.
To determine the w arranty for a specific drive, use a web browser t o access the
following web page:
www.seagate.com/support/service/
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.
Supports Hotplug operation per SATA II
specification
*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.
50,000
Yes
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NL35 Series SATA Product Manual, Rev. B
2.2Formatted ca pacity*
ModelFormatted capacityGuaranteed sectors Bytes per sector
ST3400832NS and ST3400632NS400 Gbytes781,422,768512
ST3250823NS and ST3250623NS250 Gbytes488,397,168512
*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.
NL35 Series SATA Product Manual, Rev. B
7
2.4Recording and int erface tech nology
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
I/O data-transfer rate (Mbytes/sec max)150 (SATA 1.0)
Interleave1:1
Cache buffer8 Mbytes (8,192 kbytes) on ST3400832NS and
ST3250823NS models.
16 Mbytes (16,384) on ST3400632NS and
ST3250623NS models.
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
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.
*Typical seek times (msec)Read Write
Track-to-track0.81.0
Average8.09.0
Average latency:4.164.16
*Measured i n quiet mode
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 the noted
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NL35 Series SATA Product Manual, Rev. B
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.
2.7Start/stop times
Power-on to Ready (sec)10 (max)
St andby to Ready (sec)10 (max)
Ready to spindle stop (sec)12 (max)
2.8Power specifications
The drive recei ve s D C po we r ( +5V or +12V ) t hrou gh a native SATA po wer connect or. See Figure 4 on p age 18.
2.8.1Power consumption
Power requiremen ts fo r the drive s are listed i n the t able on pa ge 9. Typical powe r measu rem ent s 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.
• 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 powe r is me asure d usi ng 40 p ercen t ran dom seeks, 4 0 per cent r ead/ wri te m ode ( 1 write for each
10 reads) and 20 percent drive idle mode.
• 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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