Write Sectors (30H/31H); Figure 140. Write Sectors Command (30H/31H) - IBM IC35L020 - Deskstar 20 GB Hard Drive Specifications

15.40 Write Sectors (30h/31h)

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 140. Write Sectors Command (30h/31h)

The Write Sectors command transfers one or more sectors from the host to the device; the data is then
written to the disk media.
The sectors are transferred through the Data Register 16 bits at a time.
If an uncorrectable error occurs, the write will be terminated at the failing sector.
Output parameters to the device
Sector Count
Sector Number
Cylinder High/Low
H
R
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
V V V V V V V V
1 L 1 D H H H H
0 0 1 1 0 0 0 R
4 3 2 1
IDN 0 ABT T0N AMN
V 0 V 0
This parameter represents the number of continuous sectors to be transferred.
If zero is specified, then 256 sectors will be transferred.
The sector number of the first sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 0–7. (L=1)
The cylinder number of the first sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 8–15 (Low), 16–23 (High). (L=1)
The head number of the first sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 24–27. (L=1)
This parameter represents the retry bit. If it is set to one, retries are disabled. If it
is ignored, write cache is enabled. (Ignoring the retry bit is in violation of ATA-2.)
Deskstar 60 GXP Hard disk drive specification
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 V
187
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
V V V V V V V V
- - - - H H H H
see below
4 3 2 1
DSC DRQ COR IDX
V – 0 –
0
ERR
V