28
Western Digital Hard Disk Drive OEM Specification
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
17 Hz
45 Hz
48 Hz
62 Hz
65 Hz
150 Hz
200 Hz
500 Hz
RMS
(m/sec
2
)
[(m/sec
2
)
2
/Hz]
1.9 x
10E
–3
1.1 x
10E
–1
1.1 x
10E
–1
7.7 x
10E
–1
7.7 x
10E
–1
9.6 x
10E
–2
9.6 x
10E
–2
4.8 x
10E
–2
4.8 x
10E-2
6.57
Table 21 Random Vibration PSD Profile Break Points (operating)
The overall RMS (Root Mean Square) level is 6.57 m/sec
2
(0.67 G).
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
2
(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 9.8 m/sec
2
(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
6.6.1.3
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
100 Hz
200 Hz 800 Hz 1000 Hz 1500 Hz 1700 Hz 2000 Hz
RMS
(Rad/s
2
)
[(Rad/s
2
)
2
/Hz]
1.90E
-02
1.90E
-02
1.87E
-01
1.87E
-01
5.33E
-02
7.70E
-03
4.00E
-03
4.00E
-03
12.5
Table 22 Random Vibration (Rotational) PSD Profile Break Points
