IBM DARA-206000 - Travelstar 12 GB Hard Drive Specifications page 169

12.31.1.7 SMART Write Log Sector (Subcommand D6h)
This command writes 512 bytes data to the specified log sector.
The 512 bytes data are transfered at a command and the Sector Count value shall be set to one. The Sector
Number shall be set to specify the log sector address (Figure 113). If Read Only log sector is specified, the
device returns ABRT error.
12.31.1.8 SMART Enable Operations (Subcommand D8h)
This subcommand enables access to all S.M.A.R.T. capabilities within the device. Prior to receipt of a
SMART Enable Operations subcommand, Attribute Values are neither monitored nor saved by the device.
The state of S.M.A.R.T. (either enabled or disabled) will be preserved by the device across power cycles.
Once enabled, the receipt of subsequent SMART Enable Operations subcommands will not affect any of the
Attribute Values.
Upon receipt of the SMART Enable Operations subcommand from the host, the device asserts BSY,
enables S.M.A.R.T. capabilities and functions, clears BSY and asserts INTRQ.
12.31.1.9 SMART Disable Operations (Subcommand D9h)
This subcommand disables all S.M.A.R.T.capabilities within the device including the device's attribute
autosave feature. After receipt of this subcommand the device disables all S.M.A.R.T. operations. Non self-
preserved Attribute Values will no longer be monitored. The state of S.M.A.R.T. (either enabled or disabled)
is preserved by the device across power cycles. Note that this subcommand does not preclude the device's
power mode attribute autosaving.
Upon receipt of the SMART Disable Operations subcommand from the host, the device asserts BSY, disa-
bles S.M.A.R.T. capabilities and functions, clears BSY and asserts INTRQ.
After receipt of the device of the SMART Disable Operations subcommand from the host, all other
S.M.A.R.T. subcommands -- with the exception of SMART Enable Operations -- are disabled, and invalid
and will be aborted by the device (including the SMART Disable Operations subcommand), returning the
error code as specified in Figure 124 on page 173.
Any Attribute Values accumulated and saved to volatile memory prior to receipt of the SMART Disable
Operations command will be preserved in the device's Attribute Data Sectors. If the device is re-enabled,
these Attribute Values will be updated, as needed, upon receipt of a SMART Read Attribute Values or
SMART Save Attribute Values command.
12.31.1.10 SMART Return Status (Subcommand DAh)
This command is used to communicate the reliability status of the device to the host's request. Upon receipt
of the SMART Return Status subcommand the device asserts BSY, saves any updated Attribute Values to
the reserved sector and compares the updated Attribute Values to the Attribute Thresholds.
If the device does not detect a Threshold Exceeded Condition, or detects a Threshold Exceeded Condition
but involving attributes are advisory,the device loads 4Fh into the Cylinder Low register, C2h into the Cyl-
inder High register, clears BSY, and asserts INTRQ.
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Command Descriptions