Samsung spinpoint v40 Smart enable/disable attribute autosave D2h, Smart enable operations D8h

DISK DRIVE OPERATION

6.4.24.2Smart 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.

6.4.24.3Smart 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.

6.4.24.4Smart 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)

72 SpinPoint V40 Product Manual