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11.25 Read Multiple (C4h)
Com m and Block Output Registers
Register
7
6
Data
-
-
Feature
-
-
Sector Count
V
V
Sector Number
V
V
Cylinder Low
V
V
Cylinder High
V
V
Device/Head
1
L
Command
1
1
Error Register
7
6
5
4
CRC
UNC
0
IDN
0
V
0
V
Table 183 Read Multiple Commands (C4h)
The Read Multiple command reads one or more sectors of data from disk media, and then transfers the data from
the device to the host.
The sectors are transferred through the Data Register 16 bits at a time. Command execution is identical to the Read
Sector(s) command except that an interrupt is generated for each block (as defined by the Set Multiple command)
instead of for each sector.
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
D
H
H
H
H
0
0
0
1
0
0
3
2
1
0
0
ABT
T0N
AMN
0
V
0
0
Western Digital Hard Disk Drive OEM Specification
Com m and Block Input Registers
Register
7
6
Data
-
-
...See Below ...
Error
Sector Count
V
V
Sector Number
V
V
Cylinder Low
V
V
Cylinder High
V
V
Device/Head
-
-
...See Below ...
Status
Status Register
7
6
5
4
BSY
RDY
DF
DSC DRQ
0
V
0
V
206
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
-
-
H
H
H
H
3
2
1
0
COR
IDX
ERR
-
0
-
V
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