IBM IC35L020 - Deskstar 20 GB Hard Drive - Rotational Shock; Acoustics-Unit Sound Power Level Testing; Figure 55. Sinusoidal Shock Wave; Figure 56. Rotational Shock

9.6.4.2 Sinusoidal shock wave
The shape is approximately a half-sine pulse. The following table shows the maximum acceleration level
and duration.
2
(2 disks)
400
2
(1 disk)
400
2
(3 disks)
350
1175 (all models)
Duration (ms)Acceleration level (G)
Figure 55. Sinusoidal shock wave
9.6.5 Rotational shock
All shock inputs shall be applied around the actuator pivot axis.
20,0002
30,0001
Rad/s
2
Duration (ms)
Figure 56. Rotational Shock
9.7 Acoustics—Unit Sound Power level testing
The sound power emission levels are measured in accordance with ISO 7779. The upper limit criteria of
the octave sound power levels are given in Bels relative to one pico watt and are shown in the following
table.
3.53.23.53.13.53.1
Quiet seek mode
3.73.43.73.43.73.4
Performance seek
mode
Operating
3.43.13.43.03.43.0
Idle
Max.
(Bel)
Typical
(Bel)
Max.
(Bel)
Typical
(Bel)
Max.
(Bel)
Typical
(Bel)
Mode
321Number of disks
Figure 57. Sound power levels
Deskstar 60 GXP Hard disk drive specification
56