Fujitsu MHV2040BH, Product Manual

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5.3 Host Commands
C141-E224 5-55
(16) SMART (X’B0’)
This command predicts the occurrence of device failures depending on the
subcommand specified in the Features field. If the Features field contains values
that are not supported with the command, the Aborted Command error is issued.
Before issuing the command, the host must set the key values in the Cylinder Low
and Cylinder High field (4Fh in the Cylinder Low field and C2h in the Cylinder
High field). If the key values are incorrect, the Aborted Command error is issued.
If the failure prediction function is disabled, the device returns the Aborted
Command error to subcommands other than those of the SMART Enable
Operations (with the Features field set to D8h).
If the failure prediction function is enabled, the device collects and updates data
on specific items. The values of items whose data is collected and updated by the
device in order to predict device failures are hereinafter referred to as attribute
values.