IBM IC35L020 Hard Drive Specifications - Page 174

S.M.A.R.T. Read Attribute Thresholds Subcommand D1h

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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 S.M.A.R.T. Read Attribute Values S.M.A.R.T. Read Attribute Thresholds S.M.A.R.T. Enable/disable Attribute Autosave S.M.A.R.T. Save Attribute Values S.M.A.R.T. Execute Off-line Immediate S.M.A.R.T. Read Log Sector S.M.A.R.T. Write Log Sector S.M.A.R.T. Enable Operations S.M.A.R.T. Disable Operations S.M.A.R.T. Return Status S.M.A.R.T. Enable/Disable Automatic Off Line Figure 120. S.M.A.R.T. Function Set subcommands 15.32.1 S.M.A.R.T. Read Attribute Values (Subcommand D0h) This subcommand returns the Attribute Threshold of the device to the host. Upon receipt of the S.M.A.R.T. 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. 15.32.2 S.M.A.R.T. Read Attribute Thresholds (Subcommand D1h) This subcommand returns the Attribute Thresholds of the device 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 transfers the 512 bytes of Attribute Thresholds information to the host. 15.32.3 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 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 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 Sector Count Register of the device 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 Figure 132, "S.M.A.R.T. Error Codes" on page 174. Deskstar 60 GXP Hard disk drive specification 160

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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.
S.M.A.R.T. Enable/Disable Automatic Off Line
DBh
S.M.A.R.T. Return Status
DAh
S.M.A.R.T. Disable Operations
D9h
S.M.A.R.T. Enable Operations
D8h
S.M.A.R.T. Write Log Sector
D6h
S.M.A.R.T. Read Log Sector
D5h
S.M.A.R.T. Execute Off-line Immediate
D4h
S.M.A.R.T. Save Attribute Values
D3h
S.M.A.R.T. Enable/disable Attribute Autosave
D2h
S.M.A.R.T. Read Attribute Thresholds
D1h
S.M.A.R.T. Read Attribute Values
D0h
Subcommand
Code
Figure
120.
S.M.A.R.T. Function Set subcommands
15.32.1
S.M.A.R.T. Read Attribute Values (Subcommand D0h)
This subcommand returns the Attribute Threshold of the device to the host. Upon receipt of the
S.M.A.R.T. 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.
15.32.2
S.M.A.R.T. Read Attribute Thresholds (Subcommand D1h)
This subcommand returns the Attribute Thresholds of the device 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 transfers the 512 bytes of Attribute
Thresholds information to the host.
15.32.3
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 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
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 Sector Count Register of the device 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 Figure 132, "S.M.A.R.T. Error Codes" on page 174.
Deskstar
60 GXP Hard disk drive specification
160