Seek (7Xh); Figure 116. Seek Command (7Xh) - IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive Specifications

12.26 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 116. 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
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 LBA address bits 0 - 7 for seek. (L=1)
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)
The head number of the seek
In LBA mode this register specifies LBA address bits 24 - 27 for seek. (L=1)
In LBA mode this register contains current LBA bits 0 - 7. (L=1)
In LBA mode this register contains current LBA bits 8 - 15 (Low), 16 - 23 (High).
(L=1)
In LBA mode this register contains current LBA bits 24 - 27. (L=1)
Deskstar 40GV & 75GXP hard disk drive specifications
Command Block Input
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
152
Registers
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
- - - - - - - -
see below
4 3 2 1
DSC DRQ COR IDX
V – 0 –
0
ERR
V