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5 - 52 C141-E116-01EN
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.
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
H
(CM) 10110000
1F6
H
(DH)
×××
DV xx
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(FR)
Key (C2h)
Key (4Fh)
xx
xx
Subcommand
At command completion (I-O registers setting contents)
1F7
H
(ST) Status information
1F6
H
(DH)
×××
DV xx
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(ER)
Key-failure prediction status (C2h-2Ch)
Key-failure prediction status (4Fh-F4h)
xx
xx
Error information
The attribute value information is 512-byte data; the format of this data is shown in Table 5.9. The
host can access this data using the SMART Read Attribute Values subcommand (FR register =
D0h). The insurance failure threshold value data is 512-byte data; the format of this data is shown
in Table 5.10. The host can access this data using the SMART Read Attribute Thresholds
subcommand (FR register = D1h).