13.32.1.11 S.M.A.R.T. Enable/Disable Automatic Off-Line (subcommand DBh)
This subcommand enables and disables the optional feature that cause the device to perform the set of
off-line data collection activities that automatically collect attribute data in an off-line mode and then save
this data to the device's nonvolatile memory. This subcommand may either cause the device to
automatically initiate or resume performance of its off-line data collection activities or cause the automatic
off-line data collection feature to be disabled. This subcommand also enables and disables the off-line
read scanning feature that cause the device to perform the entire read scanning with defect reallocation as
the part of the off-line data collection activities.
The Sector Count register shall be set to specify the feature to be enabled or disabled.
Enable Off-line Read Scanning F9h
Enable Automatic Off-line F8h
Disable Off-line Read Scanning 01h
Disable Automatic Off-line 00h
Feature Description Sector Count
A value of zero—written by the host into the device's Sector Count register before issuing this
subcommand—shall cause the automatic off-line data collection feature to be disabled. Disabling this
feature does not preclude the device from saving attribute values to nonvolatile memory during some
other normal operation—such as during a power-on, during a power-off sequence, or during an error
recovery sequence.
A value of one written by the host into the device's Sector Count register before issuing this subcommand
shall cause the off-line read scanning feature to be disabled. The Device does not perform the off-line
read scanning at the off-line data collection activities which is initiated by the S.M.A.R.T. Execute Off-line
Immediate(Subcommand D4h) or automatically if the off-line read scanning feature is disabled.
A value of F8h—written by the host into the device's Sector Count register before issuing this
subcommand—shall cause the automatic Off-line data collection feature to be enabled.
A value of F9 written by the host into the device's Sector Count register before issuing this subcommand
shall cause the off-line read scanning feature to be enabled. The Device perform the off-line read
scanning at the off-line data collection activities which is initiated by the S.M.A.R.T. Execute Off-line
Immediate(Subcommand D4h) even if the automatic off-line feature is disabled.
Any other non-zero value—written by the host into this register before issuing this subcommand—is
vender specific and will not change the current Automatic Off-Line Data Collection and Off-line Read
Scanning status. However, the device may respond with the error code specified in Figure 120 on
page 175.
Travelstar 32GH/30GT/20GN hard disk drive specifications
163
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