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12.55.1.3 SMART Enable/Disable Attribute Autosave (Subcommand D2h)
This subcommand Enables and Disables the Attribute Autosave feature of the device. The SMART Enable/Disable
Attribute Autosave subcommand either allows the device to automatically save its updated Attribute Values to the
Attribute Data Sector periodically; or this subcommand causes the Autosave feature to be disabled. The state of the
Attribute Autosave feature (either enabled or disabled) will be preserved by the device across power cycle.
A value of 00h written by the host into the device’s Sector Count Register before issuing the SMART Enable/Disable
Attribute Autosave subcommand will cause this feature to be disabled. Disabling this feature does not preclude the
device from saving Attribute Values to the Attribute Data sectors during some other normal operation such as during
a power-up or power-down.
A value of F1h written by the host into the device’s Sector Count Register before issuing the SMART Enable/Disable
Attribute Autosave subcommand will cause this feature to be enabled. Any other non-zero value written by the host
into this register before issuing the SMART Enable/Disable Attribute Autosave subcommand will not change the
current Autosave status but the device will respond with the error code specified in Table 242.
The SMART Disable Operations subcommand disables the Autosave feature along with the device’s SMART
operations.
Upon the receipt of the subcommand from the host, the device asserts BSY, Enables or Disables the Autosave feature,
clears BSY and asserts INTRQ
Table 223 SMART Enable/Disable Attribute Autosave (B0h-D2h)
Command Input
Field
Description
FEATURE
D2h
COUNT
Value
Description
00h
Disable attribute autosave
01h-F0h
N/A
F1h
Enable attribute autosave
F2h-FFh
N/A
LBA
Bit
Description
27:24
N/A
23:8
C24Fh
7:0
N/A
DEVICE
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
Command
7:0 B0h
Normal Outputs
See Normal Outputs in Section 12.7 Flush Cache (E7h)
Error Outputs See Error Outputs in Section 12.12 Idle (E3h / 97h) 12.55.1.4 SMART Save Attribute Values (Subcommand D3h)
This subcommand causes the device to immediately save any updated Attribute Values to the device’s Attribute Data
sector regardless of the state of the Attribute Autosave feature. Upon receipt of the SMART Save Attribute Values
subcommand from the host, the device writes any updated Attribute Values to the Attribute Data sector.
303
Hard Disk Drive Specification