Fujitsu MHD2021AT, MHC2032AT, MHC2040AT manual Features Register values subcommands and functions

Interface

Table 5.7 Features Register values (subcommands) and functions

Features Resister	Function
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 infomation 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 infomation 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 ≠ 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.

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