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13.11 Initialize Device Parameters (91h)
Table 82: Initialize Device Parameters command (91h)
Command Block Output Registers
Register
Data
Feature
Sector Count
LBA Low
LBA Mid
LBA High
Device
Command
Error Register
7
6
5
CRC UNC
0
0
0
0
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 reflects 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 hard reset occurs.
• A soft reset occurs and the Set Feature option of CCh is set.
Output parameters to the device
Sector Count
H
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
V V V V V V V V
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D H H H H
1 0 0 1 0 0 0 1
4
3
2
1
IDN
0
ABT T0N AMN
0
0
V
0
This indicates the number of sectors per track. Zero (0) indicates 0 sectors per track
instead of 256 sectors per track. It means that there are no sectors per track.
This indicates the number of heads minus 1 per cylinder. The minimum is 0 and the maxi-
mum is 15.
Travelstar 80GN Hard Disk Drive Specification
Command Block Input Registers
Register
Data
Error
Sector Count
LBA Low
LBA Mid
LBA High
Device
Status
0
7
6
BSY RDY DF DSC DRQ
0
0
0
122
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
Status Register
5
4
3
2
COR IDX
0
-
-
0
1
0
ERR
-
V
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