Table 25 Random Vibration Psd Profile Break Points (Nonoperating); Table 26 Sinusoidal Shock Wave; Operating Shock; Nonoperating Shock - Hitachi HDS721050CLA362 Specifications

Frequency 2 Hz
G2/Hz 0.001
Table 24
Random vibration PSD profile break points (nonoperating)
6.6.2.2
Swept sine vibration
 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 10 G half-sine shock pulse of 11 ms duration in all models.
 No data loss occurs with a 30 G half-sine shock pulse of 4 ms duration in all models.
 No data loss occurs with a 70 G half-sine shock pulse of 2 ms duration.
6.6.4

Nonoperating shock

The drive will operate with no degradation of performance 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 50 G. (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 meters/second
6.6.4.2
Sinusoidal shock wave
The shape is approximately half-sine pulse. The figure below shows the maximum acceleration level and
duration.
Models
1D/2D models
3D model
All models
Table 25
Sinusoidal shock wave
HITACHI Deskstar & CinemaStar 7K1000.B & Deskstar E7K1000 Hard Disk Drive specification
4 Hz 8 Hz
0.03 0.03
Accleration level (G)
350
300
150
36
40 Hz 55 Hz
0.003 0.01
Duration (ms)
2
2
11
70 Hz 200 Hz
0.01 0.001