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DISK DRIVE OPERATION
SpinPoint V40 Product Manual
72
6.4.24.2 Smart enable/disable attribute autosave (D2h)
This command enables and disables the optional attribute autosave feature of the device. Depending upon the
implementation, this command may either allow the device, after some vendor specified event, to
automatically save its updated attribute values to non-volatile memory; or this command may cause the
autosave feature to be disabled. The state of the attribute autosave feature (either enabled or disabled), shall
be preserved by the device across power cycles.
A value of zero written by the host into the device’s Sector Count register before issuing this command shall
cause this feature to be disabled. Disabling this feature does not preclude the device from saving SMART
data 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 F1h written by the host into the device’s Sector Count register before issuing this command shall
cause this feature to be enabled. Any other meaning of this value or any other non-zero value written by the
host into this register before issuing this command may differ from device to device. The meaning of any
non-zero value written to this register at this time shall be preserved by the device across power cycles.
If this command is not supported by the device, the device shall return command aborted upon receipt from
the host
During execution of the autosave routine the device shall not set BSY to one or clear DRDY to zero. If the
device receives a command from the host while executing its autosave routine it shall respond to the host
within two seconds.
6.4.24.3 Smart enable operations (D8h)
This command enables access to all SMART capabilities within the device. Prior to receipt of this command
SMART data are neither monitored nor saved by the device. The state of SMART (either enabled or
disabled) shall be preserved by the device across power cycles. Once enabled, the receipt of subsequent
SMART ENABLE OPERATIONS commands shall not affect any SMART data or functions.
6.4.24.4 Smart execute off-line immediate (D4h)
This command causes the device to immediately initiate the optional set of activities that collect SMART
data in an off-line mode and then save this data to the device’s non-volatile memory.
During execution of its off-line activities the device shall not set BSY nor clear DRDY.
If the device is in the process of performing its set of off-line data collection activities (as a result of
receiving a SMART EXECUTE OFF-LINE IMMEDIATE command from the host), and is interrupted by
any new command from the host except a SMART DISABLE OPERATIONS, SMART EXECUTE OFF-
LINE IMMEDIATE, or STANDBY IMMEDIATE command, the device shall suspend or abort its off-line
data collection activities and service the host within two seconds after receipt of the new command. After
servicing the interrupting command from host the device may immediately re-initiate or resume its off-line
data collection activities without any additional commands from host (see the definition for Bit 2 in the Off-
line data collection capability byte in 6.4.20.5)