240
Western Digital Hard Disk Drive OEM Specification
11.44
Seek (7xh)
Com m and Block Output Registers
Com m and 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
…See Below …
Sector Count
-
-
-
-
-
-
-
-
Sector Count
-
-
-
-
-
-
-
-
Sector Number
V
V
V
V
V
V
V
V
Sector Number
V
V
V
V
V
V
V
V
Cylinder Low
V
V
V
V
V
V
V
V
Cylinder Low
V
V
V
V
V
V
V
V
Cylinder High
V
V
V
V
V
V
V
V
Cylinder High
V
V
V
V
V
V
V
V
Device/Head
1
L
1
D
H
H
H
H
Device/Head
-
-
-
-
H
H
H
H
Command
0
1
1
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
V
0
V
0
0
0
V
0
V
-
0
-
V
Table 210 Seek Command (7xh)
The Seek command initiates a seek to the designated track and selects the designated head. The device need not
be formatted for a seek to execute properly.
Output Parameters To The Device
Sector Number
In LBA mode, this register specifies LBA address bits 0
– 7 for seek. (L=1)
Cylinder High/Low
The cylinder number of the seek.
In LBA mode, this register specifies LBA address bits 8
– 15 (Low), 16 – 23 (High) for seek.
(L=1)
H
The head number of the seek.
In LBA mode, this register specifies LBA address bits 24
– 27 for seek. (L=1)
Input Parameters From The Device
Sector Number
In LBA mode, this register contains current LBA bits 0
– 7. (L=1)
Cylinder High/Low
In LBA mode, this register contains current LBA bits 8
– 15 (Low), 16 – 23 (High). (L=1)
H
In LBA mode, this register contains current LBA bits 24
– 27. (L=1)
