Fujitsu MPD3XXXAH Product Manual page 117

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.
The host can predict failures in the device by periodically issuing the SMART Return Status
subcommand (FR register = DAh) to reference the CL and CH registers.
If an attribute value is below the insurance failure threshold value, the device is about to fail or
the device is nearing the end of it life . In this case, the host recommends that the user quickly
backs up the data.
At command issuance (I-O registers setting contents)
1F7 (CM)
H
1F6 (DH)
H
1F5 (CH)
H
1F4 (CL)
H
1F3 (SN)
H
1F2 (SC)
H
1F1 (FR)
H
At command completion (I-O registers setting contents)
1F7 (ST)
H
1F6 (DH)
H
1F5 (CH)
H
1F4 (CL)
H
1F3 (SN)
H
1F2 (SC)
H
1F1 (ER)
H
5 - 50
1 0 1 1
DV
Key (C2h)
Key (4Fh)
xx
xx
Subcommand
Status information
DV
Key-failure prediction status (C2h-2Ch)
Key-failure prediction status (4Fh-F4h)
xx
xx
Error information
C141-E072-01EN
0 0 0 0
xx
xx