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Note.
At power-down, the read/write heads automatically move to the
shipping zone. The head and slider assembly park inside of the
maximum data cylinder. When power is applied, the heads re-
calibrate to Track 0.
1.8.5.1 Operating shock
The Marathon 2250 and the Marathon 1680 incorporate SafeRite shock
protection and can withstand a maximum operating shock of 125 Gs
without nonrecoverable data errors (based on half-sine shock pulses of
2 msec).
1.8.5.2 Nonoperating shock
The nonoperating shock level that the Marathon 2250 and Marathon
1680 can tolerate without incurring physical damage or degradation in
performance is 350 Gs (based on half-sine shock pulses of 2 msec
duration) or 150 Gs (based on half-sine shock pulses of 11 msec
duration). Shock pulses are defined by MIL-STD-202 F with the ampli-
tude tolerance controlled to ± 5%.
1.8.6 Vibration
For vibration specifications, it is assumed that the drive is mounted in an
approved orientation with the input levels at the drive mounting screws.
For the nonoperating specifications, it is assumed that the read/write
heads are positioned in the shipping zone.
1.8.6.1 Operating vibration
The following table lists the maximum vibration levels that the drive may
experience without incurring physical damage, data loss or performance
degradation.
5–22 Hz 0.02-inch displacement (peak-to-peak)
22–400 Hz 0.75 Gs acceleration (0 to peak)
400–22 Hz 0.75 Gs acceleration (0 to peak)
22–5 Hz 0.02-inch displacement (peak-to-peak)
Marathon 2250 and Marathon 1680 Product Manual 13