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11.66 Write Multiple (C5h)
Com m and Block Output Registers
Register
7
Data
-
Feature
-
Sector Count
V
Sector Number
V
Cylinder Low
V
Cylinder High
V
Device/Head
1
Command
1
Error Register
7
6
5
4
CRC
UNC
0
IDN
0
0
0
V
Table 257 Write Multiple Command (C5h)
The Write Multiple command transfers one or more sectors from the host to the device, and then the data is written to
the disk media.
Command execution is identical to the Write Sector(s) command except that an interrupt is generated for each block
(as defined by the Set Multiple command) instead of for each sector. The sectors are transferred through the Data
Register 16 bits at a time.
Output Parameters To The Device
Sector Count
Sector Number
Cylinder High/Low
H
Input Parameters From The Device
Sector Count
Sector Number
Cylinder High/Low
H
6
5
4
3
2
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
L
1
D
H
H
H
1
0
0
0
1
0
3
2
1
0
0
ABT
T0N AMN
0
V
0
0
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)
The number of requested sectors not transferred. This will be zero, unless an
unrecoverable error occurs.
The sector number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 0 - 7. (L=1)
The cylinder number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 8 - 15 (Low), 16 - 23 (High). (L=1)
The head number of the last transferred sector. (L=0)
In LBA mode, this register contains current LBA bits 24 - 27. (L=1)
Western Digital Hard Disk Drive OEM Specification
Com m and Block Input Registers
0
Register
7
-
Data
-
-
Error
V
Sector Count
V
V
Sector Number
V
V
Cylinder Low
V
V
Cylinder High
V
H
Device/Head
-
1
Status
Status Register
7
6
5
4
BSY
RDY
DF
DSC
0
V
0
V
295
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
-
-
-
H
H
H
H
...See Below ...
3
2
1
0
DRQ COR
IDX
ERR
-
0
-
V
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