Deskstar T7K500 Hard Disk Drive Specification
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12.13 Initialize Device Parameters (91h)
Table 90: Initialize Device Parameters command (91h)
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.
Command Block Output Registers Command Block Input Registers
Register 7 6 5 4 3 2 1 0 Register 7 6 5 4 3 2 1 0
Data - - - - - - - - Data - - - - - - - -
Feature - - - - - - - - Error - - - - - - - -
Sector Count V V V V V V V V Sector Count - - - - - - - -
Sector Number - - - - - - - - Sector Number - - - - - - - -
Cylinder Low - - - - - - - - Cylinder Low - - - - - - - -
Cylinder High - - - - - - - - Cylinder High - - - - - - - -
Device/Head 1 - 1 D H H H H Device/Head - - - - - - - -
Command 1 0 0 1 0 0 0 1 Status see below
Error Register Status Register
7654321 0 76543 21 0
CRC UNC 0 IDN 0 ABT T0N AMN BSY RDY DF DSC DRQ COR IDX ERR
00000V0 0 0V0-- 0- V
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