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Table 5.7 Features Register values (subcommands) and functions
Features Resister
X'D0'
SMART Read Attribute Values:
A device that received this subcommand asserts the BSY bit and saves all the
updated attribute values. The device then clears the BSY bit and transfers 512-byte
attribute value information to the host.
* For information about the format of the attribute value information, see Table 5.8.
X'D1'
SMART Read Attribute Thresholds:
This subcommand is used to transfer 512-byte insurance failure threshold value data
to the host.
* For information about the format of the insurance failure threshold value data, see
Table 5.9.
X'D2'
SMART Enable-Disable Attribute AutoSave:
This subcommand is used to enable (SC register !!XX!! 00h) or disable (SC register
= 00h) the setting of the automatic saving feature for the device attribute data. The
setting is maintained every time the device is turned off and then on. When the
automatic saving feature is enabled, the attribute values are saved before the device
enters the power saving mode. However, if the failure prediction feature is disabled,
the attribute values are not automatically saved.
When the device receives this subcommand, it asserts the BSY bit, enables or
disables the automatic saving feature, then clears the BSY bit.
X'D3'
SMART Save Attribute Values:
When the device receives this subcommand, it asserts the BSY bit, saves device
attribute value data, then clears the BSY bit.
X'D8'
SMART Enable Operations:
This subcommand enables the failure prediction feature. The setting is maintained
even when the device is turned off and then on.
When the device receives this subcommand, it asserts the BSY bit, enables the failure
prediction feature, then clears the BSY bit.
X'D9'
SMART Disable Operations:
This subcommand disables the failure prediction feature. The setting is maintained
even when the device is turned off and then on.
When the device receives this subcommand, it asserts the BSY bit, disables the
failure prediction feature, then clears the BSY bit.
X'DA'
SMART Return Status:
When the device receives this subcommand, it asserts the BSY bit and saves the
current device attribute values. Then the device compares the device attribute values
with insurance failure threshold values. If there is an attribute value exceeding the
threshold, F4h and 2Ch are loaded into the CL and CH registers. If there are no
attribute values exceeding the thresholds, 4Fh and C2h are loaded into the CL and
CH registers. After the settings for the CL and CH registers have been determined,
the device clears the BSY bit
The host must regularly issue the SMART Read Attribute Values subcommand (FR register =
D0h), SMART Save Attribute Values subcommand (FR register = D3h), or SMART Return Status
subcommand (FR register = DAh) to save the device attribute value data on a medium.
Alternative, the device must issue the SMART Enable-Disable Attribute AutoSave subcommand
(FR register = D2h) to use a feature which regularly save the device attribute value data to a
medium.
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Function
C141-E034-02EN
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