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11.28 Read Native Max Address Ext (27h)
Com m and Block Output Registers
Register
Data Low
Data High
Current
Feature
Previous
Current
Sector Count
Previous
Current
Sector Number
Previous
Current
Cylinder Low
Previous
Current
Cylinder High
Previous
Device/Head
Command
Error Register
7
6
5
4
CRC
UNC
0
IDN
0
0
0
0
Table 186 Read Native Max Address Ext (27h)
This command returns the native max LBA of HDD which is not affected by Set Max Address Ext command.
Input Parameters From The Device
Sector Number (HOB=0) LBA (7:0) of the address of the Native max address.
Sector Number (HOB=1) LBA (31:24) of the address of the Native max address.
Cylinder Low (HOB=0)
Cylinder Low (HOB=1)
Cylinder High (HOB=0)
Cylinder High (HOB=1)
7 6
5 4 3
2 1 0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1 1
1 D -
-
-
-
0 0
1 0 0
1 1 1
3
2
1
0
0
ABT
T0N
AMN
0
V
0
0
LBA (15:8) of the address of the Native max address.
LBA (39:32) of the address of the Native max address.
LBA (23:16) of the address of the Native max address.
LBA (47:40) of the address of the Native max address.
Western Digital Hard Disk Drive OEM Specification
Com m and Block Input Registers
Register
Data Low
Data High
Error
HOB=0
Sector Count
HOB=1
HOB=0
Sector Number
HOB=1
HOB=0
Cylinder Low
HOB=1
HOB=0
Cylinder High
HOB=1
Device/Head
Status
Status Register
7
6
5
BSY
RDY
DF
DSC
0
V
0
210
7
6
5
4
3
2
-
-
-
-
-
-
-
-
-
-
-
-
...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
V
V
V
V
V
V
V
V
V
V
-
-
-
-
-
-
...See Below ...
4
3
2
1
DRQ
COR
IDX
-
-
0
-
1
0
-
-
-
-
-
-
-
-
V
V
V
V
V
V
-
-
0
ERR
V
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