IBM DTTA-351010 Hard Drive Specifications - Page 63

Non-Operating Vibrations, Operating Shock, Non-Operating Shock

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6.8.2 Non-Operating Vibrations The drive does not sustain permanent damage or loss of recorded data after being subjected to the environment described below. 6.8.2.1 Random Vibration The test consists of a random vibration applied for each of three mutually perpendicular axes with the time duration of 10 minutes per axis. The PSD levels for the test simulates the shipping and relocation environment which is shown below. Figure 50. Random Vibration PSD Profile Breakpoints (Non-Operating) Random Vibration PSD Profile Breakpoints (Non-Operating) Hz 2 4 8 40 55 70 [ G ² /Hz] 0.001 0.03 0.03 0.003 0.01 0.01 200 0.001 Overall RMS (Root Mean Square) level of vibration is 1.04G (RMS). 6.8.2.2 Swept Sine Vibration 2 G (Zero to peak), 5 to 500 to 5 Hz sine wave 0.5 oct/min sweep rate 3 minutes dwell at two major resonances 6.8.3 Operating Shock The drive meets the following criteria. No data loss with 10G 11msec half-sine shock pulse No data loss with 65G 2msec half-sine shock pulse The shock pulses of each level are applied to the drive, ten pulses for each direction and for all three axes. There must be a minimum of 30 seconds delay between shock pulses. The input level is applied to a base plate where the drive is attached with four screws. 6.8.4 Non-Operating Shock The drive withstands the following half-sine shock pulse No data loss with 75G 11ms No data loss with 175G 2ms The shocks are applied for each direction of the drive for three mutually perpendicular axes and one axis at a time. Input levels are measured on a base plate where the drive is attached with four screws. The drive withstands the following Rotational Shock. No data loss with Rotational Shock 12,000 rad/s² 2ms applied around the axis of actuator pivot. Note: Actuator is automatically locked at power-off to keep the heads on a landing zone. Specification 55

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6.8.2
Non-Operating Vibrations
The drive does not sustain permanent damage or loss of recorded data after being subjected to the environ-
ment described below.
6.8.2.1
Random Vibration
The test consists of a random vibration applied for each of three mutually perpendicular axes with the time
duration of 10 minutes per axis.
The PSD levels for the test simulates the shipping and relocation environ-
ment which is shown below.
Overall RMS (Root Mean Square) level of vibration is 1.04G (RMS).
6.8.2.2
Swept Sine Vibration
2 G (Zero to peak), 5 to 500 to 5 Hz sine wave
0.5 oct/min sweep rate
3 minutes dwell at two major resonances
6.8.3
Operating Shock
The drive meets the following criteria.
No data loss with 10G 11msec half-sine shock pulse
No data loss with 65G 2msec half-sine shock pulse
The shock pulses of each level are applied to the drive, ten pulses for each direction and for all three axes.
There must be a minimum of 30 seconds delay between shock pulses.
The input level is applied to a base
plate where the drive is attached with four screws.
6.8.4
Non-Operating Shock
The drive withstands the following half-sine shock pulse
No data loss with 75G 11ms
No data loss with 175G 2ms
The shocks are applied for each direction of the drive for three mutually perpendicular axes and one axis at a
time.
Input levels are measured on a base plate where the drive is attached with four screws.
The drive withstands the following
Rotational Shock
.
No data loss with Rotational Shock 12,000 rad/s² 2ms applied around the axis of actuator pivot.
Note:
Actuator is automatically locked at power-off to keep the heads on a landing zone.
Figure 50. Random Vibration PSD Profile Breakpoints (Non-Operating)
Random Vibration PSD Profile Breakpoints (Non-Operating)
Hz
2
4
8
40
55
70
200
[G²/Hz]
0.001
0.03
0.03
0.003
0.01
0.01
0.001
Specification
55