Hitachi 7K250 Specifications - Page 50
Vibration and shock
UPC - 000004558972
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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 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 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 Vertical x10-3 0.02 [G2/Hz] 1.1 1.1 8.0 8.0 1.0 1.0 0.5 0.5 0.67 1.1 1.1 8.0 8.0 1.0 1.0 0.08 0.08 0.56 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 environment 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 27: Random Vibration PSD profile breakpoints (nonoperating) Frequency 2Hz 4Hz 8Hz 40Hz 55Hz G2/Hz 0.001 0.03 0.03 0.003 0.01 70Hz 0.01 200Hz 0.001 Deskstar 7K250 Hard Disk Drive Specification 36