Deskstar 7K250 Hard Disk Drive Specification
36
6.6 Vibration and shock
All vibration and shock measurements recorded in this section are made with a drive that has no mounting attach-
ments for the systems. The input power for the measurements is applied to the normal drive mounting points.
6.6.1 Operating vibration
6.6.1.1 Random vibration
The test is 30 minutes of random vibration using the power spectral density (PSD) levels shown below in each of
three mutually perpendicular axes. The disk drive will operate without non-recoverable errors when subjected to
the above random vibration levels.
The overall RMS (root mean square) level is 0.67 G for horizontal vibration and 0.56 G for vertical.
Table 25: Random vibration PSD
The overall RMS (root mean square) level is 0.67 G for horizontal vibration and 0.56 G for vertical.
6.6.1.2 Swept sine vibration
The drive will meet the criteria shown below while operating in the specified conditions:
•
No errors occur with 0.5 G 0 to peak, 5 to 300 to 5 Hz sine wave, 0.5 oct/min sweep rate with 3-minute
dwells at two major resonances
•
No data loss occurs with 1 G 0 to peak, 5 to 300 to 5 Hz sine wave, 0.5 oct/min sweep rate with 3-minute
dwells at two major resonances
6.6.2 Nonoperating vibration
The drive does not sustain permanent damage or loss of previously recorded data after being subjected to the envi-
ronment described below
6.6.2.1 Random vibration
The test consists of a random vibration applied in each of three mutually perpendicular axes for a duration of 10
minutes per axis. The PSD levels for the test simulate the shipping and relocation environment shown below.
Table 26: Random vibration PSD profile break points (operating)
Direction
5Hz
17Hz
45Hz
48Hz
62Hz
65Hz
150Hz
200Hz
500Hz
RMS
(G)
Horizontal x10–3
[G2/Hz
0.02
1.1
1.1
8.0
8.0
1.0
1.0
0.5
0.5
0.67
Vertical x10–3
[G2/Hz]
0.02
1.1
1.1
8.0
8.0
1.0
1.0
0.08
0.08
0.56
Table 27: Random Vibration PSD profile breakpoints (nonoperating)
Frequency
2Hz
4Hz
8Hz
40Hz
55Hz
70Hz
200Hz
G2/Hz
0.001
0.03
0.03
0.003
0.01
0.01
0.001
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