Hitachi HDS723020BLA642 - Non Operating Shock; Operating Shock; Table 18 Random Vibration PSD Profile Break Points (Nonoperating)

Hitachi hard disk drive specifications
40
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
2 (
1.04 G)
Frequency
2 Hz
4 Hz
8 Hz
40 Hz
55 Hz
70 Hz
200 Hz
(m
2
/sec
4
) /Hz
0.096
2.89
2.89
0.289
0.962
0.962
0.096
Table 18 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
2
(10G) half-sine shock pulse of 11 ms duration
 No data loss occurs with a 294 m/sec
2
(30G) half-sine shock pulse of 4 ms duration.
 No data loss occurs with a 686 m/sec
2
(70G) half-sine shock pulse of 2 ms duration.
6.6.4 Non operating shock
The drive will operate with 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 is1 ms
 Average acceleration level is 490 m/sec
2
(50G). (Average response curve value during the time following
the 1 ms rise time and before the 1 ms fall with a time "duration of 11 ms")
 Minimum velocity change is 4.23 m/sec