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• High instantaneous (burst) data transfer rates (up to 100 Mbytes per second) using Ultra DMA mode 5.
• Giant magnetoresistive (GMR) recording heads and EPRML technology, which provide the drives with
increased areal density.
• 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 System™, which includes Drive Defense, Data Defense, and Diagnostic 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.
• Support for autodetection of master/slave drives that use cable select (CSEL).
Figure 1. Momentus 42 disc drive
1
Actual spin speed is 5,400 RPM.
Momentus 42 Product Manual, Rev. A1
2Momentus 42 Product Manual, Rev. A
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
ST94019A, ST93015A, and ST92014A model drives.
2.1Specification summary
The specificatio ns lis ted in th is table ar e for quick reference. For de tails on specification me as ur eme nt o r de finition, see the appropriate section of this manual.
Internal data transfer rate OD (Mbytes/sec max)48.2546.0548.25
Sustained data transfer rate OD (Mbytes/sec)31.0
I/O data-transfer rate (Mbytes/sec max)100
ATA data-transfer modes supportedPIO modes 0–4;
Height9.5 +/-0.2 mm (0.374 +/-.0078 inches)
Width69.85 +/-0.25 mm (2.75 +/-0.0098 inches)
Length100.2 +/-0.25 mm (3.945 +/-0.0098 inches)
Weight (typical)99 grams (0.218 lb)
Average latency (msec)5.6
Power-on to ready (sec typical)3.9
Standby to ready (sec typical)2.5 sec
Startup current 5V (peak)1.2 amps
Track-to-track seek time (msec typical)1.5 (read), 2.0 (write)
Average seek time (msec typical)12.0
Average seek, read (msec typical)12.0
2
max)655865
(spin speed actually 5,400 RPM)
Multiword DMA modes 0–2;
Ultra DMA modes 0–5
Momentus 42 Product Manual, Rev. A3
Table 1: Specifi cations (Continued)
Drive specificationST94019AST93015AST92014A
Average seek, write (msec typical)14.0
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 errors1 per 10
Mean time between failures (power-on hours)330,000 at 25°C (2400 POH)
When addressing these d rives in LBA mode, all bl ocks (sectors) are c onsecutively numbered fr om 0 to n–1,
where n is the number of guaranteed sectors as defined above.
2.4Physical organization
ModelRead/write headsNumber of discs
ST94019A21
ST93015A21
ST92014A11
Momentus 42 Product Manual, Rev. A5
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