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12.55.1.11 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 save this data to the device’s
non-volatile 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.
A value of zero written by the host into the device’s Sector Count Register before issuing this subcommand shall
cause the feature to be disabled. Disabling this feature does not preclude the device from saving attribute values to
non-volatile memory during some other normal operation such as during a power-on or power-off sequence or during
an error recovery sequence.
A value of F8h written by the host into the device’s Sector Count Register before issuing this subcommand shall
cause this feature to be enabled. 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, but the device
may respond with the error code specified in Table 242.
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Hard Disk Drive Specification