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6.6
Vibration and Shock
All vibration and shock measurements recorded in this section are made with a drive that has no mounting
attachments 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 (Linear)
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
below random vibration levels.
Frequency
5 Hz
1.9 x
2
2
[(m/sec
)
/Hz]
10E–3
Table 21 Random Vibration PSD Profile Break Points (operating)
The overall RMS (Root Mean Square) level is 6.57 m/sec
6.6.1.2 Swept Sine Vibration (Linear)
The drive will meet the criteria shown below while operating in the specified conditions:
No errors occur with 4.9 m/sec
3-minute dwells at two major resonances
No data loss occurs with 9.8 m/sec
3-minute dwells at two major resonances
6.6.1.3 Random Vibration (Rotational)
The drive will meet the criteria shown below while operating in the specified conditions:
Less than 20% performance degradation
The overall RMS (Root Mean Square) level of vibration is 12.5Rad/sec^2. PSD profile is shown below.
Frequency
20 Hz
1.90E
2
2
[(Rad/s
)
/Hz]
-02
Table 22 Random Vibration (Rotational) PSD Profile Break Points
17 Hz
45 Hz
48 Hz
1.1 x
1.1 x
7.7 x
10E–1
10E–1
10E–1
2
(0.5 G) 0 to peak, 5 to 300 to 5 Hz sine wave, 0.5 oct/min sweep rate with
2
(1 G) 0 to peak, 5 to 300 to 5 Hz sine wave, 0.5 oct/min sweep rate with
100 Hz
200 Hz 800 Hz 1000 Hz
1.90E
1.87E
1.87E
-02
-01
-01
Western Digital Hard Disk Drive OEM Specification
62 Hz
65 Hz
150 Hz
7.7 x
9.6 x
9.6 x
10E–1
10E–2
10E–2
2
(0.67 G).
1500 Hz
5.33E
7.70E
-02
-03
28
200 Hz 500 Hz
4.8 x
4.8 x
10E–2
10E-2
1700 Hz
2000 Hz
(Rad/s
4.00E
4.00E
-03
-03
RMS
2
(m/sec
)
6.57
RMS
2
)
12.5
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