IBM DTLA-305040 Hard Drive Specifications - Page 137

Initialize Device Parameters 91h

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12.9 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 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 V 0 - - 0 -V Figure 95. 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 following events: Ÿ Another Initialize Device Parameters command is received. Ÿ The device is powered off. Ÿ Soft reset/Hard reset has occurred and the Set Feature option of CCh is set instead of 66h. Output parameters to the device Sector Count The number of sectors per track. Zero does not mean there are 256 sectors per track, but that there are no sectors per track. H The number of heads minus 1 per cylinder. The minimum is 0 and the maximum is 15. Note: The following conditions need to be satisfied to avoid invalid number of cylinders beyond FFFFh. Ÿ (Total number of user addressable sectors)/((Sector Count)*(H+1)) = < FFFFh Ÿ The total number of user addressable sectors is described in Identify Device command. Deskstar 40GV & 75GXP hard disk drive specifications 125

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12.9 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
- - - - - - - -
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
V
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 95. 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 para-
meters.
The parameters remain in effect until following events:
°
Another Initialize Device Parameters command is received.
°
The device is powered off.
°
Soft reset/Hard reset has occurred and the Set Feature option of CCh is set instead of 66h.
Output parameters to the device
Sector Count
The number of sectors per track. Zero does not mean there are 256 sectors per track,
but that there are no sectors per track.
H
The number of heads minus 1 per cylinder. The minimum is 0 and the maximum is 15.
Note: The following conditions need to be satisfied to avoid invalid number of cylinders beyond FFFFh.
°
(Total number of user addressable sectors)/((Sector Count)*(H+1)) = < FFFFh
°
The total number of user addressable sectors is described in Identify Device command.
Deskstar 40GV & 75GXP hard disk drive specifications
125