Smart Read Attribute Values (Subcommand D0H); Smart Read Attribute Thresholds (Subcommand D1H); Smart Enable/Disable Attribute Autosave (Subcommand D2H); Smart Save Attribute Values (Subcommand D3H) - IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive Specifications

12.32.1 SMART Read Attribute Values (Subcommand D0h)

This subcommand returns the Attribute Values of the device to the host. Upon receipt of the SMART
Read Attribute Values subcommand from the host the device saves any updated Attribute Values to the
Attribute Data sectors and then transfers the 512 bytes of Attribute Value information to the host.

12.32.2 SMART Read Attribute Thresholds (Subcommand D1h)

This subcommand returns the Attribute Thresholds of the device to the host. Upon receipt of the SMART
Read Attribute Thresholds subcommand from the host the device reads the Attribute Thresholds from the
Attribute Threshold sectors and then transfers the 512 bytes of Attribute Thresholds information to the
host.

12.32.3 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 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 Sector Count Register of the device 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 Sector Count Register of the device 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 Figure 138 on page 0.
The SMART Disable Operations subcommand disables the Autosave feature along with the SMART
operations of the device.
Upon receipt of the subcommand from the host the device asserts BSY, enables or disables the
Autosave feature, clears BSY, and asserts INTRQ.

12.32.4 SMART Save Attribute Values (Subcommand D3h)

This subcommand causes the device to immediately save any updated Attribute Values to the Attribute
Data sector of the device 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.

12.32.5 SMART Execute Off-line Immediate (Subcommand D4h)

This subcommand causes the device to immediately initiate the set of activities that collect Attribute data
in an off-line mode (off-line routine) or execute a self-test routine in either captive or off-line mode.
The Sector Number register shall be set to specify the operation to be executed.
Sector Number
0
1
2
127
129
130
Operation to be executed
Execute SMART off-line data collection routine immediately
Execute SMART Short self-test routine immediately in off-line mode
Execute SMART Extended self-test routine immediately in off-line mode
Abort off-line mode self-test routine
Execute SMART Short self-test routine immediately in captive mode
Execute SMART Extended self-test routine immediately in captive mode
Deskstar 40GV & 75GXP hard disk drive specifications
166