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6.6.2
Nonoperating Vibration
The drive does not sustain permanent damage or loss of previously recorded data after being subjected to the
environment described below
6.6.2.1 Random Vibration
The test consists of a random vibration applied for each of three mutually perpendicular axes with the time duration
of 10 minutes per axis. The PSD levels for the test simulate the shipping and relocation environment shown below.
The overall RMS (Root Mean Square) level of vibration is 10.2 m/sec
Frequency
2 Hz
2
2
[(m/sec
)
/Hz]
0.096
Table 23 Random Vibration PSD Profile Break Points (nonoperating)
6.6.2.2 Swept Sine Vibration
19.6 m/sec
2
(2 G) (Zero to peak), 5 to 500 to 5 Hz sine wave
0.5 oct/min sweep rate
3 minutes dwell at two major resonances
6.6.3
Operating Shock
The drive meets the following criteria while operating in the conditions described below. The shock test consists of
10 shock inputs in each axis and direction for total of 60. There must be a delay between shock pulses long enough
to allow the drive to complete all necessary error recovery procedures.
No error occurs with a 98.1 m/sec
No data loss occurs with a 294 m/sec
No data loss occurs with a 686 m/sec
6.6.4
Nonoperating Shock
The drive will operate without non-recoverable errors after being subjected to shock pulses with the following
characteristics.
6.6.4.1 Trapezoidal Shock Wave
Approximate square (trapezoidal) pulse shape
Approximate rise and fall time of pulse is 1 ms
Average acceleration level is 490 m/sec
ms rise time and before the 1 ms fall with a time "duration of 11 ms")
Minimum velocity change is 4.23 m/sec
4 Hz
8 Hz
2.890
2.890
2
(10 G) half-sine shock pulse of 11 ms duration
2
(30 G) half-sine shock pulse of 4 ms duration
2
(70 G) half-sine shock pulse of 2 ms duration
2
(50 G). (Average response curve value during the time following the 1
Western Digital Hard Disk Drive OEM Specification
2
(1.04 G).
40 Hz
55 Hz
0.289
0.962
29
70 Hz
200 Hz
0.962
0.096
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