Asus PCI-DA2100 User Manual page 111

Idle Drive Failure Detection
From the "Drive-side SCSI Parameters" menu, select "Periodic Drive
Time – Disable" and then press [Enter]. Choose the desired interval
for idle drive failure detection.
IMPORTANT:
By choosing a time value to enable the "Periodic Drive Check Time",
the controller will poll all of the connected drives in the controller's
drive channels at the assigned interval. Drive removal will be
detected even if a host does not attempt to access data on the drive.
If the "Periodic Drive Check Time" is set to "Disabled" (the default
setting is "Disabled"), the controller will not be able to detect any
drive removal that occurs after the controller has been powered on.
The controller will only be able to detect drive removal when a host
attempts to access the data on the drive.
ASUS PCI-DA2100/PCI-DA2200 User's Manual
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