Seagate, Seagate Technology and the Wave logo are registered trademarks of Seagate
Technology LLC in the United States and/or other countries. Momentus, SeagateSeaBOARD, SeaFONE, SeaTDD, and SeaTools are either trademarks or registered trademarks of Seagate Technology LLC or one of its affiliate d compa nies in the United States a nd/
or other countries. All other trademarks or registered trademarks are the property of their
respective owners.
One gigabyte, or GB, equals one billion bytes and one terabyte, or TB, equals one trillion
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 p urpo ses. Actual quan tities w ill vary based on vari ou s factors, including fi le
size, file format, features and application software. Seagate reserves the right to change,
without notice, product offerings or specifications.
• State-of-the-art cache and on-the-fly error-correction algorithms
• Full-track multiple-sector transfer capability without local processor intervention
• Quiet operation
• 800 Gs nonoperating shock
• SeaTools diagnostic software performs a drive self-test that eliminates unnecessary drive returns
• The 3D Defense System™, w hich in clu des Drive Defense , D at a Defen se and D iagnost ic Defense, offers the
industry’s most comprehensive protection for disc drives
• Support for S.M.A.R.T. drive monitoring and reporting
• Support for Read Multiple and Write Multiple commands
2
Momentus 7200.2 SATA Product Manual, Rev. D
1.1About the Serial ATA (SATA) 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 normally necessary to set
any jumpers or other configuration options. A jumper position is available to configure the drive for 1.5Gb/s
operation for systems that can not operate at a 3Gb/s transfer rate.
• 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 providi ng legacy sof twar e suppo rt. S erial
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 http://www.serialata.com.
Momentus 7200.2 SATA Product Manual, Rev. D
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
ST9200420ASG, ST9200420AS, ST9160823AS, ST9160823ASG, ST9120823AS, ST9100821AS,
ST980813AS and ST980813ASG 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.
T a ble 1: Drive speci ficat ion s
ST9200420ASG
Drive specification
Formatted Gbytes (512 bytes/sector)*20016012010080
Guaranteed sectors390,721,968312,581,808234,441,648195,371,568156,301,488
Bytes per sector512
Default sectors per track63
Default read/write heads16
Default cylinders16,383
Physical read/write heads4332
Discs2221
Recording density in BPI (bits/inch max)1,014,000853,000
Track density TPI (tracks/inch max)162,600155,000
Areal density (Gbits/inch2 max)169.4131
Spindle speed (RPM)7,200
Internal transfer rate (Mbits/sec max)850711
Sustained transfer rate OD (Mbytes/sec)69.559
I/O data transfer rate (Gb/s max)3.0 (can also be configured for 1.5Gb/s operation)
ATA data-transfer modes supportedSATA-1
Cache buffer (Mbytes)168
Height (max)9.5 +/- 0.2 mm (0.374 +/- .0078 inches)
Width (max)69.85 mm +/- 0.25 mm (2.75 +/- 0.00984 inches)
Length (max)100.5 +/- 0.25 mm (3.957 +/- +/- 0.00984 inches)
Weight (typical)115 grams (0.254 lb)
Average latency (msec)4.17 msec
Power-on to ready (typical)4 seconds
Standby to ready (typical)4 seconds
Startup current (typical) +5V (peak)1.1 amps
Track-to-track seek time (msec typical)1.0 (read), 1.5 (write)
Average seek, read (msec typical)11.0
Average seek, write (msec typical)13.0
Seek power (typical)2.3 watts
Operating power (typical)2.1 watts
Idle mode, low power (typical)0.8 watts
Standby mode (average)0.25 watts***
Sleep mode (average)0.2 watts***
Voltage tolerance (including noise)+5V ± 5% / -8% startup
Ambient temperature 0° to 60°C (operating)
Temperature gradient
(°C per hour max, non-condensing)
Relative humidity5% to 90% (operating)
Relative humidity gradient (non-condensing) 30% per hour max (operating and nonoperating)
Wet bulb temperature (max)30°C (operating)
Altitude, operating–304.8 m to 3,048 m
Altitude, nonoperating
(meters below mean sea level, max)
Shock, operating (Gs max at 2 msec)300
Shock, nonoperating (Gs max at 2 msec)800
Shock, nonoperating (Gs max at 1 msec)900
Shock, nonoperating (Gs max at 0.5 msec)400
Vibration, operating1.0 G (0 to peak, 5–500 Hz)
Vibration, nonoperating5.0 G (0 to peak, 5–500 Hz)
Drive acoustics, sound power (bels)
Idle**2.5 (typical)
Seek2.9 (typical)
Nonrecoverable read errors1 per 10
Annualized Failure Rate (AFR)0.73%
Warranty5 Years on distribution units.
ST9200420AS
–40° to 70°C (nonoperating)
20°C (operating)
30°C (nonoperating)
5% to 95% (nonoperating)
40°C (nonoperating)
(–1000 ft to 10,000+ ft)
–304.8 m to 12,192 m
(–1000 ft to 40,000+ ft)
2.8 (max)
3.1 (max)
14
To determine the warranty for a specific drive, use a web browser to access the following
web page: http://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
*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.
***Typical notebooks will pull power to th e drive when ente ring S3 and S4; while in the S3 and S4 states, dr ive sleep and drive standby
modes will not contribute to battery power consumption.
ST9200420AS
600,000 software-controlled power on/off cycles
20,000 hard power on/off cycles
600,000 software-controlled power on/off cycles
20,000 hard power on/off cycles
Yes
ST9160823AS
ST9160823ASG ST9120823AS ST9100821AS
ST980813AS
ST980813ASG
2.2Formatted ca pacity
ModelFormatted capacity*Guaranteed sectors Bytes per sector
ST9200420AS and ST9200420ASG200 Gbytes390,721,968512
ST9160823AS and ST9160823ASG160 Gbytes312,581,808512
ST9120823AS120 Gbytes234,441,648512
ST9100821AS100 Gbytes195,371,568512
ST980813AS and ST980813ASG80 Gbytes156,301,488512
*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 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.
6
Momentus 7200.2 SATA Product Manual, Rev. D
2.4Physical or ganization
Drive modelRead/write headsNumb er of discs
ST9200420AS and ST9200420ASG
ST9160823AS and ST9160823ASG
ST9120823AS
ST9100821AS
ST980813AS and ST980813ASG21
4
2
3
2.5Recording and interfac e technology
200 GB models160 - 80 GB models
InterfaceSerial ATA (SATA)
Recording density BPI (bits/inch max)1,014,000853,000
Track density TPI (tracks/inch max)162,600155,000
Areal density (Gbits/inch2 max)169.4131
Spindle speed (RPM) (± 0.2%)7,200
Maximum Internal transfer rate (Mbits/sec)850711
Sustained transfer rate OD (Mbytes/sec max)69.559
I/O data-transfer rate (Mbytes/sec max)300 (can also be configured for 150MB/s operation)
Interleave1:1
Cache buffer16 Mbytes (16,384 kbytes)8 Mbytes (8,192 kbytes)
2.6Physical characteristics
Drive specification
Height(mm)
(inches)
Width(mm)
(inches)
Length(mm)
(inches)
Typical weight(grams)
(pounds)
9.5 +/-0.2
0.374 +/-0.0078
69.85 +/-0.25
2.75 +/-0.00984
100.5+/- 0.25
3.957 +/- 0.00984
115 grams
(0.254 lb)
Momentus 7200.2 SATA Product Manual, Rev. D
7
2.7Seek 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.
Table 2: Typical seek times
*Typical seek times (msec)Read Write
Track-to-track1.01.5
Average11.013.0
Full-stroke22.024.0
Average latency4.17
*Measured in performance 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
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.
2.8Start/stop times
Time to readyTypicalMax
Power-on to Ready (sec)48
St andby to Ready (sec)48
Spin down58
8
Momentus 7200.2 SATA Product Manual, Rev. D
2.9Power specifications
The drive receives DC power (+5V) through a native SATA power connector.
2.9.1Power consumption
Power requirements for the drives are listed in Table 3, on page 8. Typical power measurements are based on
an average of drives tested, under nominal conditions, at 25°C ambient temperature.
• Spinup power
Spinup power is measured from the time of power-on to the time that the drive spindle re aches operating speed.
• Seek mode
During seek mod e, the read /write actuator arm move s toward a spe cific positi on on the d isc surface and does
not execute a read or write operati on. Servo ele ctronics ar e acti ve. Seek mode power is mea sure d based on
three random seek operations every 100 msecs. This mode is not typical.
• Read/write power and current
Read/write power is measured with the heads on track, based on three 63 sector read or write operations
every 100 msecs.
• 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 model