Hitachi HDT725025VLA380 Specifications - Page 75
Vibration and shock
UPC - 829686001084
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7.6 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. 7.6.1 Operating vibration 7.6.1.1 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. Table 43: Random vibration PSD profile break points (operating) Direction x10-3 [G2/Hz] 5Hz 0.02 17Hz 45Hz 48Hz 1.1 1.1 8.0 62Hz 8.0 65Hz 150Hz 200Hz 500Hz 1.0 1.0 0.5 0.5 RMS (G) 0.67 The overall RMS (root mean square) level is 0.67 G. 7.6.1.2 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 7.6.2 Nonoperating vibration The drive does not sustain permanent damage or loss of previously recorded data after being subjected to the environment described below 7.6.2.1 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 44: Random Vibration PSD profile breakpoints (nonoperating) Frequency 2Hz 4Hz G2/Hz 0.001 0.03 8Hz 40Hz 55Hz 0.03 0.003 0.01 70Hz 0.01 200Hz 0.001 The overall RMS (root mean square) level of vibration is 1.04 G. 7.6.2.2 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 Deskstar T7K500 Hard Disk Drive Specification 61