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1.8.6.2 Nonoperating vibration
The following table lists the maximum nonoperating vibration that the
drive may experience without incurring physical damage or degradation
in performance.
5–22 Hz 0.2-inch displacement (peak-to-peak)
22–400 Hz 4 Gs acceleration (0 to peak)
400–22 Hz 4 Gs acceleration (0 to peak)
22–5 Hz 0.2-inch displacement (peak-to-peak)
1.9 Drive acoustics
Drive acoustics are measured as sound power, using techniques that are
generally consistent with ISO document 7779. Measurements are taken
under essentially free-field conditions over a reflecting plane, using a total
of nine microphones that measure in the 250–4,000 Hz band. This method-
ology determines broad-band and narrow-band noise, and discrete fre-
quency components. For all tests, the drive is oriented with the cover facing
upward.
Mode Typical Maximum
Idle (sound power-bels) 3.5 3.8
Seek (sound power-bels) 3.8 4.1
Idle (sound pressure-dBA) 24 28
Seek (sound pressure-dBA) 26 30
1.10 Reliability
Nonrecoverable read errors 1 per 10
13
bits read
Mean time between failures
(MTBF)
300,000 power-on hours
(nominal power, at sea level and
40°C ambient temperature)
Contact start-stop cycles
(CSS)
50,000 cycles
(at nominal voltage and 40°C, with 60
cycles per hour and a 50% duty cycle)
Preventive maintenance None required
Service life 5 years
14 Marathon 2250 and Marathon 1680 Product Manual