In order to select a subcommand the host must write the subcommand code to the Features Register of
the device before issuing the S.M.A.R.T. Function Set command. The subcommands and their respective
codes are listed below.
S.M.A.R.T. Enable/Disable Automatic Off LineDBh
S.M.A.R.T. Return StatusDAh
S.M.A.R.T. Disable OperationsD9h
S.M.A.R.T. Enable OperationsD8h
S.M.A.R.T. Write Log SectorD6h
S.M.A.R.T. Read Log SectorD5h
S.M.A.R.T. Execute Off-line ImmediateD4h
S.M.A.R.T. Save Attribute ValuesD3h
S.M.A.R.T. Enable/disable Attribute AutosaveD2h
S.M.A.R.T. Read Attribute ThresholdsD1h
S.M.A.R.T. Read Attribute ValuesD0h
SubcommandCode
Figure
120.
S.M.A.R.T. Function Set subcommands
15.32.1 S.M.A.R.T. Read Attribute Values (Subcommand D0h)
This subcommand returns the Attribute Threshold of the device to the host. Upon receipt of the
S.M.A.R.T. 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.
15.32.2 S.M.A.R.T. Read Attribute Thresholds (Subcommand D1h)
This subcommand returns the Attribute Thresholds of the device to the host. Upon receipt of the
S.M.A.R.T. 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.
15.32.3 S.M.A.R.T. Enable/Disable Attribute Autosave
(Subcommand D2h)
This subcommand enables and disables the Attribute Autosave feature of the device. The S.M.A.R.T.
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
S.M.A.R.T. 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
S.M.A.R.T. 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 S.M.A.R.T. Enable/Disable
Attribute Autosave subcommand will not change the current Autosave status but the device will respond
with the error code specified in Figure 132, "S.M.A.R.T. Error Codes" on page 174.
Deskstar 60 GXP Hard disk drive specification
160
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