IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 179

S.M.A.R.T. Subcommand

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11.33.1 S.M.A.R.T. Subcommand In order to select a subcommand the host must write the subcommand code to the Features Register of the device before issuing the S.M.A.R.T. Function Set command. The subcommands and their respective codes are listed below. Code D0h D1h D2h D3h D4h D5h D6h D8h D9h DAh DBh Subcommand SMART Read Attribute Values SMART Read Attribute Thresholds SMART Enable/disable Attribute Autosave SMART Save Attribute Values SMART Execute Off-line Immediate SMART Read Log Sector SMART Write Log Sector SMART Enable Operations SMART Disable Operations SMART Return Status SMART Enable/Disable Automatic Off Line 11.33.1.1 SMART Read Attribute Values (Subcommand D0h) This subcommand returns the Attribute Values of the device to the host. Upon receipt of the SMART Read Attribute Values subcommand from the host the device saves any updated Attribute Values to the Attribute Data sectors and then transfers the 512 bytes of Attribute Value information to the host. 11.33.1.2 SMART Read Attribute Thresholds (Subcommand D1h) This subcommand returns the Attribute Thresholds of the device to the host. Upon receipt of the SMART Read Attribute Thresholds subcommand from the host, the device reads the Attribute Thresholds from the Attribute Threshold sectors and then transfers the 512 bytes of Attribute Thresholds information to the host. 11.33.1.3 SMART Enable/Disable Attribute Autosave (Subcommand D2h) This subcommand enables and disables the Attribute Autosave feature of the device. The SMART Enable/Disable Attribute Autosave subcommand either allows the device to automatically save its updated Attribute Values to the Attribute Data Sector periodically or 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 Sector Count Register of the device before issuing the SMART 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 Sector Count Register of the device before issuing the SMART 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 SMART Enable/Disable Attribute Autosave subcommand will not change the current Autosave status but the device will respond with the error code specified in Figure 151 on page 177. The SMART Disable Operations subcommand disables the Autosave feature along with the SMART operations of the device. Deskstar 120GXP hard disk drive specifications 165

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11.33.1 S.M.A.R.T. Subcommand
In order to select a subcommand the host must write the subcommand code to the Features Register of
the device before issuing the S.M.A.R.T. Function Set command. The subcommands and their respective
codes are listed below.
SMART Enable/Disable Automatic Off Line
DBh
SMART Return Status
DAh
SMART Disable Operations
D9h
SMART Enable Operations
D8h
SMART Write Log Sector
D6h
SMART Read Log Sector
D5h
SMART Execute Off-line Immediate
D4h
SMART Save Attribute Values
D3h
SMART Enable/disable Attribute Autosave
D2h
SMART Read Attribute Thresholds
D1h
SMART Read Attribute Values
D0h
Subcommand
Code
11.33.1.1
SMART Read Attribute Values (Subcommand D0h)
This subcommand returns the Attribute Values of the device to the host. Upon receipt of the SMART Read
Attribute Values subcommand from the host the device saves any updated Attribute Values to the
Attribute Data sectors and then transfers the 512 bytes of Attribute Value information to the host.
11.33.1.2
SMART Read Attribute Thresholds (Subcommand D1h)
This subcommand returns the Attribute Thresholds of the device to the host. Upon receipt of the SMART
Read Attribute Thresholds subcommand from the host, the device reads the Attribute Thresholds from the
Attribute Threshold sectors and then transfers the 512 bytes of Attribute Thresholds information to the
host.
11.33.1.3
SMART Enable/Disable Attribute Autosave (Subcommand D2h)
This subcommand enables and disables the Attribute Autosave feature of the device. The SMART
Enable/Disable Attribute Autosave subcommand either allows the device to automatically save its updated
Attribute Values to the Attribute Data Sector periodically or 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 Sector Count Register of the device before issuing the SMART
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 Sector Count Register of the device before issuing the SMART
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 SMART Enable/Disable Attribute Autosave
subcommand will not change the current Autosave status but the device will respond with the error code
specified in Figure 151 on page 177.
The SMART Disable Operations subcommand disables the Autosave feature along with the SMART
operations of the device.
Deskstar 120GXP hard disk drive specifications
165