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11.27 Read Native Max Address (F8h)
Block Output Registers Com mand
Register
7
6
Data
-
-
Feature
-
-
Sector Count
-
-
Sector Number
-
-
Cylinder Low
-
-
Cylinder High
-
-
Device/Head
1
L
Command
1
1
Error Register
7
6
5
4
CRC UNC
0
IDN
0
0
0
0
Table 185 Read Native Max ADDRESS (F8h)
This command returns the native max LBA/CYL of HDD which is not affected by Set Max Address command.
The 48-bit native max address is greater than 268,435,455; the Read Native Max Address command shall return a
value of 268,435,455.
Input Parameters From The Device
Sector Number
Cylinder High/Low
H
5
4
3
2
1
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
D
-
-
-
-
1
1
1
0
0
0
3
2
1
0
0
ABT
T0N AMN
0
V
0
0
In LBA mode, this register contains native max LBA bits 0-7. (L=1)
In CHS mode, this register contains native max sector number. (L=0)
In LBA mode, this register contains native max LBA bits 8-15 (Low), 16-23 (High). (L=1)
In CHS mode, this register contains native max cylinder number. (L=0)
In LBA mode, this register contains native max LBA bits 24-27. (L=1)
In CHS mode, this register contains native max head number.(L=0)
Western Digital Hard Disk Drive OEM Specification
Com m and Block Input Registers
Register
7
6
Data
-
-
...See Below ...
Error
Sector Count
-
-
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 COR
0
V
0
-
209
5
4
3
2
1
0
-
-
-
-
-
-
-
-
-
-
-
-
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
IDX
ERR
-
0
-
V
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