IBM IC25N020ATDA04 Hard Drive Specifications - Page 151

Initialize Device Parameters 91h, Another Initialize Device Parameters command is received.

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13.12 Initialize Device Parameters (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 See Below Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status See below Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 00000V00 Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 0 0 - - 0 -V Figure 91. 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 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 instead of 66h. Output Parameters To The Device Sector Count H This indicates the number of sectors per track. Zero (0) indicates that there are no sectors per track. This indicates the number of heads minus 1 per cylinder. The minimum is 0 and the maximum is 15. Travelstar 48GH, 30GN & 15GN hard disk drive specifications 137

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13.12 Initialize Device Parameters (91h)
See below
Status
1 0 0 1 0 0 0 1
Command
- - - - - - - -
Device/Head
1 - 1 D H H H H
Device/Head
- - - - - - - -
Cylinder High
- - - - - - - -
Cylinder High
- - - - - - - -
Cylinder Low
- - - - - - - -
Cylinder Low
- - - - - - - -
Sector Number
- - - - - - - -
Sector Number
- - - - - - - -
Sector Count
V V V V V V V V
Sector Count
See Below
Error
- - - - - - - -
Feature
- - - - - - - -
Data
- - - - - - - -
Data
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Register
Command Block Input Registers
Command Block Output Registers
V
-
0
-
-
0
0
0
0
0
V
0
0
0
0
0
ERR
IDX
COR
DRQ
DSC
DF
RDY
BSY
AMN
T0N
ABT
0
IDN
0
UNC
CRC
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Status Register
Error Register
Figure 91. 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 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 instead of 66h.
Output Parameters To The Device
Sector Count
This indicates the number of sectors per track. Zero (0) indicates that there are
no sectors per track.
H
This indicates the number of heads minus 1 per cylinder. The minimum is 0 and
the maximum is 15.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
137