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12.55 SMART Function Set (B0h)
The SMART Function Set command provides access to Attribute Values, Attribute Thresholds and other low level
subcommands that can be used for logging and reporting purposes and to accommodate special user needs. The
SMART Function Set command has several separate subcommands which are selectable via the device’s Features
Register when the SMART Function Set command is issued by the host.
12.55.1
SMART Subcommand
In order to select a subcommand the host must write the subcommand code to the device’s Features Register before
issuing the SMART Function Set command. The subcommands and their respective codes are listed below.
Code
Subcommand
D0h
SMART Read Attribute Values
D1h
SMART Read Attribute Thresholds
D2h
SMART Enable/Disable Attribute Autosave
D3h
SMART Save Attribute Values
D4h
SMART Execute Off-line Immediate
D5h
SMART Read Log
D6h
SMART Write Log
D8h
SMART Enable Operations
D9h
SMART Disable Operations
DAh
SMART Return Status
DBh
SMART Enable/Disable Automatic Off-Line
12.55.1.1 SMART Read Attribute Values (Subcommand D0h)
This subcommand returns the device’s Attribute Values to the host. Upon receipt of the SMART Read Attribute Values
subcommand from the host, the device transfers 512 bytes of Attribute Value information to the host.
12.55.1.2 SMART Read Attribute Thresholds (Subcommand D1h)
This subcommand returns the device’s Attribute Thresholds to the host. Upon receipt of the SMART Read Attribute
Thresholds subcommand from the host, the transfers 512 bytes of Attribute Thresholds information to the host.
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Hard Disk Drive Specification