Hitachi HTS542516K9SA00 Specifications page 140

14.39.1.2 S.M.A.R.T. Read Attribute Thresholds (Subcommand D1h)
This subcommand returns the device's Attribute Thresholds to the host. Upon receipt of the
S.M.A.R.T. Read Attribute Thresholds subcommand from the host, the device reads the Attribute
Thresholds from the Attribute Threshold sectors and then waits for the host to transfer the 512
bytes of Attribute Thresholds information from the device.
14.39.1.3 S.M.A.R.T. Enable/Disable Attribute Autosave (Subcommand
D2h)
This subcommand enables and disables the attribute autosave feature of the device. The S.M.A.R.T.
Enable/Disable Attribute Autosave subcommand allows the device to automatically save its updated
Attribute Values to the Attribute Data Sector at the timing of the first transition to Active idle mode
after 30 minutes since the last saving of Attribute Values; this subcommand causes the autosave
feature to be disabled. The state of the Attribute Autosave feature (either enabled or disabled) will
be preserved by the device across power cycle.
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 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 non-zero 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 but the
device will respond with the error code specified in "Table 123 S.M.A.R.T. Error Codes" on Page 153.
The S.M.A.R.T. Disable Operations subcommand disables the autosave feature along with the
device's S.M.A.R.T. operations.
Upon the receipt of the subcommand from the host the device enables or disables the Autosave
feature.
14.39.1.4 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 writes any updated
Attribute Values to the Attribute Data sector.
14.39.1.5 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 Operation to be executed
Execute S.M.A.R.T. off-line data collection routine immediately
0
Execute S.M.A.R.T. Short self-test routine immediately in off-line mode
1
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
128 Reserved
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
Page 140 of 171
5K250 (SATA) OEM Specification