Write Long (32H/33H); Figure 144. Write Long Command (32H/33H) - IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive Specifications

3.5 inch ultra ata/100 hard disk drive
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12.38 Write Long (32h/33h)

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 144. Write Long Command (32h/33h)

The Write Long command transfers the data and the ECC bytes of the designated sector from the host to
the device. The data and the ECC bytes are then written to the disk media.
After 512 bytes of data have been transferred, the device will keep setting DRQ=1 to indicate that the
device is ready to receive the ECC bytes from the host. The data is transferred 16 bits at a time; the ECC
bytes are transferred 8 bits at a time. The number of ECC bytes is 4 or 40 according to the setting of the
Set Feature option. The default number after power-on is 4 bytes.
Output parameters to the device
Sector Count
Sector Number
Cylinder High/Low
H
R
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
0 0 0 0 0 0 0 1
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 1 R
4
3
2
1
IDN
0
ABT
T0N
AMN
V
0
V
0
The number of continuous sectors to be transferred. The Sector Count must be
set to one.
The sector number of the sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 0 - 7. (L=1)
The cylinder number of the 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 sector to be transferred. (L=0)
In LBA mode, this register contains LBA bits 24 - 27. (L=1)
The retry bit. If set to one, then retries are disabled.
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
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
- - - - H H H H
see below
4
3
2
1
DSC
DRQ
COR
IDX
V
0
0
ERR
V

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