Table 103.Seek Command (7Xh); Seek (7Xh) - Hitachi 7K250 - Deskstar - Hard Drive Specifications

12.35 Seek (7xh)

Table 104: Seek command (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
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 This is the cylinder number of the seek. In LBA mode this register specifies the
H
Input parameters from the device
Sector Number
Cylinder High/Low In LBA mode this register contains the current LBA bits 8–15 (Low) and bits16–23
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)
LBA address bits 8–15 (Low) and bits 16–23 (High) for seek. (L = 1)
This is 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)
(High). (L = 1)
In LBA mode this register contains the current LBA bits 24–27. (L = 1)
Deskstar 7K250 Hard Disk Drive Specification
Command Block Input Registers
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
0 7 6
BSY RDY DF DSC DRQ
0 0 V
171
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
Status Register
5 4 3 2
COR IDX
0 V - 0
1 0
ERR
- V