IBM IC35L040AVVN07-0 - 40GB IDE Deskstar 120GXP 7200RPM UATA-100 07N9682 Specifications page 181

11.33.1.7 SMART Write Log Sector (Subcommand D6h)
This command writes 512 bytes data to the specified log sector.
The 512 bytes data are transferred 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 as shown in the above figure. If the Read
Only log sector is specified, the device returns ABRT error.
11.33.1.8 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.
When 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 enables S.M.A.R.T.
capabilities and functions and then saves any updated Attribute Values to the Attribute Data sector.
11.33.1.9 SMART Disable Operations (Subcommand D9h)
This subcommand disables all S.M.A.R.T. capabilities within the device including the attribute Autosave
feature of the device. 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.
Upon receipt of the SMART Disable Operations subcommand from the host the device disables
S.M.A.R.T. capabilities and functions and then saves any updated Attribute Values to the Attribute Data
sector.
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 151 on page 177.
Any Attribute Values accumulated and saved to volatile memory prior to receipt of the SMART Disable
Operations command will be preserved in the Attribute Data Sectors of the device. 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.
11.33.1.10 SMART Return Status (Subcommand DAh)
This command is used to communicate the reliability status of the device upon the request of the host.
Upon receipt of the SMART Return Status subcommand the device saves any updated Pre-failure type
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, the device loads 4Fh into the Cylinder Low
register and C2h into the Cylinder High register.
If the device detects a Threshold Exceeded Condition, the device loads F4h into the Cylinder Low register
and 2Ch into the Cylinder High register.
11.33.1.11 SMART Enable/Disable Automatic Off-line (Subcommand DBh)
This subcommand enables and disables the optional feature that causes the device to perform the set of
off-line data collection activities that automatically collect attribute data in an off-line mode and then saves
this data to the nonvolatile memory of the device. This subcommand may either cause the device to auto-
matically initiate or resume performance of its off-line data collection activities or cause the Automatic
Off-line Data Collection feature to be disabled.
Deskstar 120GXP hard disk drive specifications
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