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13.26 Seek (7xh)
Command Block Output Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Error Register
7
6
5
CRC
UNC
0
0
0
0
Figure 115. Seek command (7xh)
The Seek command initiates a seek to the designated track and selects the designated head. The device
does not need to be formatted for a seek to execute properly.
Output parameters to the device
Sector Number
Cylinder High/Low
H
Input parameters from the device
Sector Number
Cylinder High/Low
H
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
- - - - - - - -
V V V V V V V V
V V V V V V V V
V V V V V V V V
1 L 1 D H H H H
0 1 1 1 - - - -
4
3
2
1
IDN
0
ABT
T0N
AMN
V
0
V
0
In LBA mode this register specifies the LBA address bits 0–7 for seek. (L = 1)
This is the cylinder number of the seek. In LBA mode this register specifies the
LBA address bits 8–15 (Low) and bits 16–23 (High) for seek. (L = 1)
This indicates the head number of the seek. In LBA mode this register specifies
the LBA address bits 24–27 for seek. (L = 1)
In LBA mode this register contains the current LBA bits 0–7. (L = 1)
In LBA mode this register contains the current LBA bits 8–15 (Low) and
bits 16–23 (High). (L = 1)
In LBA mode this register contains the current LBA bits 24–27. (L = 1)
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
Command Block Input Registers
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status Register
0
7
6
5
BSY
RDY
DF
0
0
V
0
157
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
V V V V V V V V
V V V V V V V V
V V V V V V V V
- - - - H H H H
see below
4
3
2
1
0
DSC
DRQ
COR
IDX
ERR
V
-
0
-
V
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