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 Te chnolog y LLC or one of it s af filiate d comp a 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.
• 800 Gs nonoperating shock, and 225 Gs operating shock.
• SeaTools™ diagnostic software performs a drive self-test that eliminates unnecessary drive returns.
• The 3D Defense S ystem™, which i nclu des Dr iv e Defen se, D at a Defens e, an d Di agn ostic Defe nse, o ffers 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.
• Support for autodetection of master/slave drives that use cable select (CSEL).
®
Figure 1. Momentus 5400.1 disc drive
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Momentus 5400.1 Product Manual, Rev. F
Momentus 5400.1 Product Manual, Rev. F
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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
ST94011A, ST92011A, ST92811A, and ST94811A model drives.
2.1Specification summary
The specifications listed in this table are for quick reference. For details on specification measurement or definition, see the appropriate section of this manual.
Full-stroke seek (msec)22 (typical); 26 (max)
Seek power (typical)2.4 watts
Read/write power (typical)2.4 watts
Idle mode (typical)1.2 watts
Standby mode0.36 watts (typical)**
Sleep mode0.36 watts (typical)**
Voltage tolerance (including noise)5V ± 5%
Ambient temperature5° to 55°C (operating)
Temperature gradient (°C per hour max)20°C (operating)
Relative humidity (noncondensing)5% to 90% (operating)
Relative humidity gradient30% per hour max
Wet bulb temperature (°C max)33°C (operating)
Altitude, operating–192.12 m to 3,048 m (–650 ft to 10,000+ ft)
Altitude, nonoperating (below mean sea level, max)–304.8 m to 12,192 m (–1,000 ft to 40,000+ ft)
Shock, operating (Gs max at 2 msec)225
Shock, nonoperating (Gs max at 2 msec)800
Shock, nonoperating (Gs max at 1 msec)800
Shock, nonoperating (Gs max at 0.5 msec)400
Vibration, operating (max displacement may apply below
10 hz)
Vibration, nonoperating (max displacement may apply
below 22 hz)
Drive acoustics, sound power (bels)
Idle*2.3 (typical)
Quiet seek2.5 (typical)
Performance seek3.0 (typical)
Nonrecoverable read errors
Mean time between failures (power-on hours)330,000 at 25°C
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.
2.4Physical organization
ModelRead/write headsNumber of discs
ST94011A21
ST94811A21
ST92011A11
ST92811A11
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Momentus 5400.1 Product Manual, Rev. F
2.5Recording and interfac e technology
TechnologySpecification
InterfaceParallel ATA
Recording methodRLL 0,11
Recording density BPI (bits/inch max)642,000
Track density TPI (tracks/inch max)100,780
Areal density (Mbits/inch2 max)65
Spindle speed (RPM) (± 0.2%)5,400
Internal data-transfer rate OD (Mbytes/sec max)48.25
Sustained data transfer rate OD (Mbytes/sec max)34.5
I/O data-transfer rate (Mbytes/sec max)100 (Ultra DMA mode 5)
Interleave1:1
Cache buffer
ST94011A and ST92011A2 Mbytes (2,048 kbytes)
ST94811A and ST92811A8 Mbytes (8,192 kbytes)
2.6Physical characteristics
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 +/-0.0098
100.2 +/-0.25
3.945 +/-0.0098
99
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Momentus 5400.1 Product Manual, Rev. F
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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 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-track1.52.0
Average12.014.0
Full-stroke22.026.0
Average latency5.65.6
*Measured in performance mode
Note. These drives are designed to consistently meet the seek times represented in this manual. Physical 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.
2.8Time to ready
Time to readyTypicalMax
Power-on to Ready (sec)3.98
St andby to Ready (sec)2.68
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Momentus 5400.1 Product Manual, Rev. F
2.9Power specifications
The drive receives DC power (+5V) through the interface connector.
2.9.1Power consumption
Power requiremen ts for the dr i ves are lis ted in the ta bl e on p age 8 . Typical power measurements are based on
an average of drives tested, under nominal conditions, using 5.0V input voltage at 25°C ambient temperature.
• Spinup power
S pinup power is measured from th e time of power-on to the time that the drive spindle r eaches 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.
• Operating power and current
Operating power is measured using 40 percent random seeks, 40 percent read/write mode (1 write for each
10 reads) and 20 percent drive idle mode.
• 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 mode.
T a ble 2: DC power
Power dissipation (watts)Average (watts, 25° C)5V typ amps