Hitachi 7K400 Specifications - Page 220
Sleep E6h/99h
UPC - 000053412935
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12.45 Sleep (E6h/99h) Table 153: Sleep command (E6h/99h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature Sector Count Sector Number Cylinder Low Cylinder High Device/Head 1 - 1 D - - - - Command 1 1 1 0 0 1 1 0 76 CRC UNC 00 Error Register 54 3 2 1 0 0 IDN 0 ABT T0N AMN 00 0 V 0 0 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Error see below Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status see below Status Register 7 654 3 2 1 0 BSY RDY DF DSC DRQ COR IDX ERR 0 V0V - 0 - V This command causes the device to enter Sleep Mode. The device is spun down and the interface becomes inactive. If the device is already spun down, the spin down sequence is not executed. A software reset or a hardware reset is the only way to recover from Sleep Mode. Deskstar 7K400 Hard Disk Drive Specification 206