Deskstar T7K250 Hard Disk Drive Specification
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12.43 S.M.A.R.T. Function Set (B0h)
Table 126: S.M.A.R.T. Function Set command (B0h)
The S.M.A.R.T. Function Set command provides access to the Attribute Values, the Attribute Thresholds, and
other low level subcommands that can be used for logging and reporting purposes and to accommodate special user
needs. The S.M.A.R.T. Function Set command has several separate subcommands which can be selected via the
Features Register of the device when the S.M.A.R.T. Function Set command is issued by the host.
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.
12.43.1 S.M.A.R.T. Function Subcommands
12.43.1.1 S.M.A.R.T. Read Attribute Values (subcommand D0h)
This subcommand returns the Attribute Values 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 transfer the 512 bytes of Attribute Value information to the host.
Command Block Output Registers Command Block Input Registers
Register 7 6 5 4 3 2 1 0 Register 7 6 5 4 3 2 1 0
Data - - - - - - - - Data - - - - - - - -
Feature V V V V V V V V Error see below
Sector Count V V V V V V V V Sector Count - - - - - - - -
Sector Number - - - - - - - - Sector Number - - - - - - - -
Cylinder Low 0 1 0 0 1 1 1 1 Cylinder Low - - - - - - - -
Cylinder High 1 1 0 0 0 0 1 0 Cylinder High - - - - - - - -
Device/Head 1 - 1 D - - - - Device/Head - - - - - - - -
Command 1 0 1 1 0 0 0 0 Status see below
Error Register Status Register
76543210 76543210
CRC UNC 0 IDN 0 ABT T0N AMN BSY RDY DF DSC DRQ COR IDX ERR
0V0V0V0V 0V0V-0-V
Code Subcommand
D0h S.M.A.R.T. Read Attribute Values
D1h S.M.A.R.T. Read Attribute Thresholds
D2h S.M.A.R.T. Enable/disable Attribute Autosave
D3h S.M.A.R.T. Save Attribute Values
D4h S.M.A.R.T. Execute Off-line Immediate
D5h S.M.A.R.T. Read Log Sector
D6h S.M.A.R.T. Write Log Sector
D8h S.M.A.R.T. Enable Operations
D9h S.M.A.R.T. Disable Operations
DAh S.M.A.R.T. Return Status
DBh S.M.A.R.T. Enable/Disable Automatic Off-line
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