Seek (7Xh); Figure 110. Seek Command (7Xh) - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

13.27 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 110. 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)
Travelstar 48GH, 30GN & 15GN 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
161
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