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12.26 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.
Table 172 Read Native Max Address Ext (27h)
Command Block Normal Outputs
Command Block Command Input
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
-
-
-
-
-
- -
-
HOB=0
-
-
-
-
-
-
-
-
Sector Count
Current
-
-
- -
-
-
-
-
Sector
Count
Previous
-
-
-
-
-
- -
-
HOB=1
-
-
-
-
-
-
-
-
HOB=0
V
V
V
V V
V
V
V
Sector Number Current
-
-
- -
-
-
-
-
Sector
Number
Previous
-
-
-
-
-
- -
-
HOB=1
V
V
V
V
V V
V
V
HOB=0
V
V
V
V V
V
V
V
Cylinder Low
Current
-
-
- -
-
-
-
-
Cylinder
Low
Previous
-
-
-
-
-
- -
-
HOB=1
V
V
V
V
V V
V
V
HOB=0
V
V
V
V V
V
V
V
Cylinder High
Current
-
-
- -
-
-
-
-
Cylinder
High
Previous
-
-
-
-
-
- -
-
HOB=1
V
V
V
V
V V
V
V
Device/Head
1 1 1 D -
-
-
-
Device/Head
-
-
-
-
-
-
-
-
Command
0 0 1 0 0 1 1 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
0
0
0
0
V
0
0
0
V
0
-
-
0
-
V
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)
LBA (15:8) of the address of the Native max address.
Cylinder Low (HOB=1)
LBA (39:32) of the address of the Native max address.
Cylinder High (HOB=0)
LBA (23:16) of the address of the Native max address.
Cylinder High (HOB=1)
LBA (47:40) of the address of the Native max address.
238
Hard Disk Drive Specification