Operating Shock; Nonoperating Shock; Nonoperating Rotational Shock; Table 45: Sinusoidal Shock Wave - Hitachi HDT725025VLA380 - Deskstar 0A33423 T7K500 250GB SATA 7200RPM 8MB Cache Hard Drive Specifications

7.6.3 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 in all models.

7.6.4 Nonoperating shock

The drive will operate with no degradation of performance after being subjected to shock pulses with the following
characteristics.
7.6.4.1 Trapezoidal shock wave
• Approximate square (trapezoidal) pulse shape
• Approximate rise and fall time of pulse is 1 ms
• Average acceleration level is 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 per second
7.6.4.2 Sinusoidal shock wave
The shape is approximately half-sine pulse. The figure below shows the maximum acceleration level and duration.

Table 45: Sinusoidal shock wave

Models
2 disk
3 disk
All models

7.6.5 Nonoperating rotational shock

All shock inputs shall be applied around the actuator pivot axis.

Table 46: Rotational shock

Duration Rad/s
1 ms 30,000
2 ms 20,000
Acceleration level (G)
350
300
150
2
Deskstar T7K500 Hard Disk Drive Specification
Duration (ms)
2
2
11
62