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12.50 Set Max Address (F9h)
The device regards a Set Max Address command as valid if this command is immediately preceded by a Read Native
Max Address command. If the device receives this command without a prior Read Native Max Address command,
the device processes a Set Max security extensions command as another command according to the Feature register
value. Valid Features values are as follows:
- 01h indicates Set Max Set Password command
- 02h indicates Set Max Lock command
- 03h indicates Set Max Unlock command
- 04h indicates Set Max Freeze LOCK command
This command overwrites the maximum number of Address of HDD in a range of actual device capacity. Once device
receives this command, all accesses beyond that Address are rejected with setting ABORT bit in status register.
Identify device command returns the Address which is set via this command as a default value.
Device returns command aborted for a second non-volatile Set Max Address command until next power on or
hardware reset.
Device returns command aborted during Set Max Locked mode or Set Max Frozen mode.
After a successful command completion, Identify Device response words (61:60) shall reflect the maximum address
set with this command.
If the 48-bit Address feature set is supported, the value placed in Identify Device response words (103:100) shall be
the same as the value placed in words (61:60). However, if the device contains greater than 268,435,455 sectors,
the capacity addressable with 28-bit commands, and the address requested is 268,435,455, the max address shall
be changed to the native maximum address, the value placed in words (61:60) shall be 268,435,455 and the value
placed in words (103:100) shall be the native maximum address.
If a host protected area has been established by a Set Max Address Ext command, the device shall return command
aborted.
Table 213 Set Max ADDRESS (F9h)
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
-
-
-
-
-
-
-
-
Data
-
-
-
-
-
-
-
-
Feature
V
V
V
V
V
V
V
V
Error
…See Below…
Sector Count
-
-
-
-
-
-
-
B
Sector Count
-
-
-
-
-
-
-
-
Sector Number
V
V
V
V
V
V
V
V
Sector Number
V
V
V
V
V
V
V
V
Cylinder Low
V
V
V
V
V
V
V
V
Cylinder Low
V
V
V
V
V
V
V
V
Cylinder High
V
V
V
V
V
V
V
V
Cylinder High
V
V
V
V
V
V
V
V
Device/Head
1
L
1
D
H
H
H
H
Device/Head
-
-
-
-
H
H
H
H
Command
1
1
1
1
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
0
0
0
0
V
0
0
0
V
0
-
-
0
-
V
291
Hard Disk Drive Specification