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14.35
Set Max Address (F9h)
Command Block Output Registers
Register
Data
Feature
Sector Count
LBA Low
LBA Mid
LBA High
Device
Command
Error Register
7
6
5
4
CRC UNC
0
IDN
0
0
0
0
Table 105 Set Max Address Command (F9h)
The Set Max Address command overwrites the max LBA/CYL of HDD in a range of actual device
capacities. The device receives this command, all accesses beyond that LBA/CYL are rejected with
setting ABORT bit in status register. Identify device command and Identify 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 Set Max Address command. Otherwise this command is interpreted as a Set Max security
extension command which is destinated by feature register. If Set Max security mode is in the
Locked or Frozen, the Set Max Address command is aborted.
For more information, see "12.10.2 Set Max security extension commands" on Page 63.
In CHS mode, LBA High, LBA Mid specify the max 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 command 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.
If a host protected area has been established by a Set Max Address Ext command, the device shall
return command aborted.
Output Parameters To The Device
Feature
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
- L - - H H H H
1 1 1 1 1 0 0 1
3
2
1
0
0
ABT T0N
AM
N
0
V
0
0
Destination code for this command
01h
SET MAX SET PASSWORD
Page 133 of 171
5K250 (SATA) OEM Specification
Command Block Input Registers
Register
Data
Error
Sector Count
LBA Low
LBA Mid
LBA High
Device
Status
Status Register
7
6
5
4
BSY RDY
DF
DSC DRQ COR IDX ERR
0
V
0
-
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...
3
2
1
0
-
0
0
V
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- Part 1 Functional Specification
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