Deskstar T7K500 Hard Disk Drive Specification
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12.42 S.M.A.R.T. Function Set (B0h)
Table 139: 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.
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
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