Samsung 3.5" hard disk drives Manual Do Utilizador

DISK DRIVE OPERATION 
 

SpinPoint V40 Product Manual 

72

 

 
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. 
 

 
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. 
 

 
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)