IBM IC35L020 Hard Drive Specifications - Page 70

Rotational shock

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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. Acceleration level (G) 75 (all models) 350 400 400 Duration (ms) 11 2 (3 disks) 2 (1 disk) 2 (2 disks) Figure 55. Sinusoidal shock wave 9.6.5 Rotational shock All shock inputs shall be applied around the actuator pivot axis. Duration (ms) 1 2 Figure 56. Rotational Shock Rad/s2 30,000 20,000 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. Number of disks Mode Idle Operating Performance seek mode Quiet seek mode Figure 57. Sound power levels 1 Typical Max. (Bel) (Bel) 3.0 3.4 3.4 3.7 2 Typical Max. (Bel) (Bel) 3.0 3.4 3.4 3.7 3 Typical Max. (Bel) (Bel) 3.1 3.4 3.4 3.7 3.1 3.5 3.1 3.5 3.2 3.5 Deskstar 60 GXP Hard disk drive specification 56

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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
11
75 (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.
20,000
2
30,000
1
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.
3.5
3.2
3.5
3.1
3.5
3.1
Quiet seek mode
3.7
3.4
3.7
3.4
3.7
3.4
Performance seek
mode
Operating
3.4
3.1
3.4
3.0
3.4
3.0
Idle
Max.
(Bel)
Typical
(Bel)
Max.
(Bel)
Typical
(Bel)
Max.
(Bel)
Typical
(Bel)
Mode
3
2
1
Number of disks
Figure 57. Sound power levels
Deskstar
60 GXP Hard disk drive specification
56