SIIG UltraATA 133 PCI RAID Quick Installation Manual page 26

The Members tab reports the device identification
(corresponding with the information in the BIOS) and the
State of each device.
Besides reporting information, the Members tab of a
mirror set allows the user to remove a specific drive from
that set, as well as add a designated Spare drive to a
Mirrored set that has experienced a disk failure. If more
than one set exists, clicking on each Set in the Configuration
Tree provides specific information for that Set.
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