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Read Multiple Ext (29h)
Command Block Output Registers
Command Block Input Registers
Register
7
6
5
4
3
2
1
0
Register
7
6
5
4
3
2
1
0
Data Low
-
-
-
-
-
-
-
-
Data Low
-
-
-
-
-
-
-
-
Data High
-
-
-
-
-
-
-
-
Data High
-
-
-
-
-
-
-
-
Feature
Current
-
-
-
-
-
-
-
-
Error
…See Below…
Previous
-
-
-
-
-
-
-
-
Current
V
V
V
V
V
V
V
V
HOB=0
-
-
-
-
-
-
-
-
Sector Count
Sector Count
Previous
V
V
V
V
V
V
V
V
HOB=1
-
-
-
-
-
-
-
-
Current
V
V
V
V
V
V
V
V
HOB=0
V
V
V
V
V
V
V
V
Sector Number
Sector Number
Previous
V
V
V
V
V
V
V
V
HOB=1
V
V
V
V
V
V
V
V
Current
V
V
V
V
V
V
V
V
HOB=0
V
V
V
V
V
V
V
V
Cylinder Low
Cylinder Low
Previous
V
V
V
V
V
V
V
V
HOB=1
V
V
V
V
V
V
V
V
Current
V
V
V
V
V
V
V
V
HOB=0
V
V
V
V
V
V
V
V
Cylinder High
Cylinder High
Previous
V
V
V
V
V
V
V
V
HOB=1
V
V
V
V
V
V
V
V
Device/Head
-
1
-
D
-
-
-
-
Device/Head
-
-
-
-
-
-
-
-
Command
0
0
1
0
1
0
0
1
Status
…See Below…
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC
UNC
0
IDN
0
ABT
T0N
AMN
BSY
RDY
DF
DSC
DRQ COR
IDX
ERR
0
V
0
V
0
V
0
0
0
V
0
V
-
0
-
V
Table 186 Read Multiple Ext Command (29h)
The Read Multiple Ext 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.
224
Western Digital Ultrastar DC HC310 SATA Product Manual