Hitachi 7K400 Specifications - Page 153
Initialize Device Parameters 91h
UPC - 000053412935
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12.13 Initialize Device Parameters (91h) Table 99: Initialize Device Parameters command (91h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature Sector Count V V V V V V V V Sector Number Cylinder Low Cylinder High Device/Head 1 - 1 D H H H H Command 1 0 0 1 0 0 0 1 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Error Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status see below 76 5 CRC UNC 0 00 0 Error Register 43 21 0 IDN 0 ABT T0N AMN 00 V0 0 7 65 BSY RDY DF 0 00 Status Register 43 2 DSC DRQ COR -- 0 10 IDX ERR -V The Initialize Device Parameters command enables the host to set the number of sectors per track and the number of heads minus 1, per cylinder. Words 54-58 in Identify Device Information reflect these parameters. The parameters remain in effect until the following events occur: • Another Initialize Device Parameters command is received • The device is powered off • A soft reset/hard reset has occurred • The Set Feature option of CCh instead of 66h is set. Output parameters to the device Sector Count This indicates the number of sectors per track. Zero (0) means that there are no sectors rather than 256 sectors per track. H This indicates the number of heads minus 1 per cylinder. The minimum is 0 and the maxi- mum is 15. The following condition needs to be met to avoid invalid number of cylinders beyond FFFFh: (Total number of user addressable sectors)/((sector count) x (H+1)) = < FFFFh The total number of user addressable sectors is described in Identify Device command. Deskstar 7K400 Hard Disk Drive Specification 139