Deskstar 7K250 Hard Disk Drive Specification
129
12.11 Initialize Device Parameters (91h)
Table 71: 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
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC
UNC
0
IDN
0
ABT
T0N
AMN
BSY RDY
DF
DSC
DRQ
COR IDX
ERR
0
0
0
0
0
V
0
0
0
0
0
-
-
0
-
V
Содержание Deskstar 7K250
Страница 2: ......
Страница 18: ...Deskstar 7K250 Hard Disk Drive Specification 4 ...
Страница 20: ...Deskstar 7K250 Hard Disk Drive Specification 6 ...
Страница 21: ...Deskstar 7K250 Hard Disk Drive specification 7 Part 1 Functional specification ...
Страница 22: ...Deskstar 7K250 Hard Disk Drive Specification 8 ...
Страница 24: ...Deskstar 7K250 Hard Disk Drive Specification 10 ...
Страница 36: ...Deskstar 7K250 Hard Disk Drive Specification 22 ...
Страница 56: ...Deskstar 7K250 Hard Disk Drive Specification 42 ...
Страница 75: ...Deskstar 7K250 Hard Disk Drive Specification 61 Part 2 Interface specification ...
Страница 76: ...Deskstar 7K250 Hard Disk Drive Specification 62 ...
Страница 78: ...Deskstar 7K250 Hard Disk Drive Specification 64 ...
Страница 86: ...Deskstar 7K250 Hard Disk Drive Specification 72 ...
Страница 112: ...Deskstar 7K250 Hard Disk Drive Specification 98 ...