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13.34 Set Max ADDRESS (F9h)
Table 106: Set Max ADDRESS (F9h)
Command Block Output Registers
Register
Data
Feature
Sector Count
LBA Low
LBA Mid
LBA High
Device
Command
7
6
5
CRC UNC
0
0
0
0
The Set Max ADDRESS command overwrites the max LBA/CYL of the drive in a range of actual device capaci-
ties. Once the device receives this command, all accesses beyond that LBA/CYL are rejected by setting the
ABORT bit in the status register. Identify the device command and Identify the device DMA command returns the
LBA/CYL which is set via this command as a default value.
This command implement SET MAX security extension commands as subcommands. But regardless of Feature
register value, the case this command is immediately preceded by a Read Native Max ADDRESS command, it is
interpreted as a Set Max ADDRESS command.
The Read Native Max ADDRESS command should be issued and completed immediately prior to issuing the Set
Max ADDRESS command. If it is not, this command is interpreted as a Set Max security extension command
which is designated by feature register.
If Set Max security mode is in the Locked or Frozen, the Set Max ADDRESS command is aborted. For more infor-
mation, see section 11.10.2 "Set Max security extension commands" on page 84.
In CHS mode LBA High and LBA Mid specify the maximum cylinder number. The Head number of DEVICE and
LBA Low are ignored. The default value (see default CHS in Identify device information) is used for that.
In LBA mode the Head number of Device, LBA High, LBA Mid and LBA Low specify the max LBA. This com-
mand sets this LBA as the max LBA of the device.
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.
7 6 5 4 3 2 1 0
- - - - - - - -
V V V V V V V V
- - - - - - - B
V V V V V V V V
V V V V V V V V
V V V V V V V V
1 L 1 D H H H H
1 1 1 1 1 0 0 1
Error Register
4
3
2
1
IDN
0
ABT T0N AMN
0
0
V
0
Travelstar 5K80Hard Disk Drive Specification
Command Block Input Registers
Register
Data
Error
Sector Count
LBA Low
LBA Mid
LBA High
Device
Status
0
7
6
BSY RDY DF DSC DRQ
0
0
V
150
7 6 5 4 3 2 1 0
- - - - - - - -
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
- - - - H H H H
see below
Status Register
5
4
3
2
COR IDX
0
-
-
0
1
0
ERR
-
V
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