Hitachi HTS421212H9AT00 - Travelstar 120 GB Hard Drive Specifications page 186

A value of 00h—written by the host into the device's Sector Count Register before issuing the S.M.A.R.T. Enable/
Disable Attribute Autosave subcommand—will cause this feature to be disabled. Disabling this feature does not
preclude the device from saving Attribute Values to the Attribute Data sectors during some other normal operation
such as during a power-up or a power-down.
A value of F1h—written by the host into the device's Sector Count Register before issuing the S.M.A.R.T. Enable/
Disable Attribute Autosave subcommand—will cause this feature to be enabled. Any other nonzero value written
by the host into this register before issuing the S.M.A.R.T. Enable/Disable Attribute Autosave subcommand will
not change the current Autosave status. The device will respond with the error code specified in Table 132:
"S.M.A.R.T. Error Codes" on page 187.
The S.M.A.R.T. Disable Operations subcommand disables the auto save feature along with the device's S.M.A.R.T.
operations.
Upon the receipt of the subcommand from the host, the device asserts BSY, enables or disables the Autosave fea-
ture, clears BSY, and asserts INTRQ.
13.39.1.4 S.M.A.R.T. Save Attribute Values (subcommand D3h)
This subcommand causes the device to immediately save any updated Attribute Values to the device's Attribute
Data sector regardless of the state of the Attribute Autosave feature. Upon receipt of the S.M.A.R.T. Save Attribute
Values subcommand from the host, the device asserts BSY, writes any updated Attribute Values to the Attribute
Data sector, clears BSY, and asserts INTRQ.
13.39.1.5 S.M.A.R.T. Execute Off-line Immediate (subcommand D4h)
This subcommand causes the device to immediately initiate the set of activities that collect Attribute data in an off-
line mode (off-line routine) or execute a self-test routine in either captive or off-line mode. The LBA Low register
shall be set to specify the operation to be executed.
LBA Low
0 Execute S.M.A.R.T. off-line data collection routine immediately
1 Execute S.M.A.R.T. Short self-test routine immediately in off-line mode
2 Execute S.M.A.R.T. Extended self-test routine immediately in off-line mode
3 Reserved
4 Execute SMART selective self-test routine immediately in off-line mode
127 Abort off-line mode self-test routine
129 Execute S.M.A.R.T. Short self-test routine immediately in captive mode
130 Execute S.M.A.R.T. Extended self-test routine immediately in captive mode
131 Reserved
132 Execute SMART selective self-test routine immediately in captive mode
Off-line mode: The device executes command completion before executing the specified routine. During execu-
tion of the routine the device will not set BSY nor clear DRDY. If the device is in the process of performing its rou-
tine and is interrupted by a new command from the host, the device will abort or suspend its routine and service the
host within two seconds after receipt of the new command. After servicing the interrupting command, the device
will resume its routine automatically or not start its routine depending on the interrupting command.
Captive mode: When executing self-test in captive mode, the device sets BSY to one and executes the specified
self-test routine after receipt of the command. At the end of the routine, the device sets the execution result in the
Operation to be executed
Travelstar 4K120 Hard Disk Drive Specification
172