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4 Momentus 42 Product Manual, Rev. A
*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.
**Typical notebooks will pull power to the drive when entering S3 and S4; while in the S3 and S4 states, drive sleep and drive standby modes
will not contribute to battery power consumption.
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 mode 0.36 watts (typical)**
Sleep mode 0.36 watts (typical)**
Voltage tolerance (including noise) 5V ± 5%
Ambient temperature 5° to 55°C (operating)
–40° to 65°C (nonoperating)
Temperature gradient (°C per hour max) 20°C (operating)
30°C (nonoperating)
Relative humidity (noncondensing) 5% to 90% (operating)
5% to 95% (nonoperating)
Relative humidity gradient 30% per hour max
Wet bulb temperature (°C max) 33°C (operating)
40°C (nonoperating)
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)
1.0 Gs (0 to peak, 5–500 Hz)
Vibration, nonoperating (max displacement may apply
below 22 hz)
5.0 Gs (0 to peak, 5–500 Hz)
Drive acoustics, sound power (bels)
Idle* 2.3 (typical)
2.5 (max)
Quiet seek 2.5 (typical)
2.7 (max)
Performance seek 3.0 (typical)
3.2 (max)
Nonrecoverable read errors 1 per 10
14
bits read
Mean time between failures (power-on hours) 330,000 at 25°C (2400 POH)
Max case temperature: 60°C
Load/Unload (U/UL) cycles
25°C, 50% relative humidity
32°C, 80% relative humidity
5°C, 80% relative humidity
5°C, 10% relative humidity
55°C, 16% relative humidity
300,000 software-controlled power on/off cycles
20,000 hard power on/off cycles
100,000 software-controlled power on/off cycles
20,000 hard power on/off cycles
Service life 5 Years
Warranty 1 Year
Table 1: Specifications (Continued)
Drive specification ST94019A ST93015A ST92014A