Cavalry Storage CADT-U32A - Manual (Page 13)

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RAID
Your product is already set up as RAID 1 (mirrored). "Mirrored" means that
each of the two drives in your disk array store the same data, providing
protection against the failure of one drive; however, when the drive appears
on your computer, it will be recognized as a single hard drive.
NOTE:
Although the box indicates two hard drives are included, the total
capacity in RAID 1 mode will not equal the sum of the two because the
second drive is used as a "backup" of the first drive. (e.g. two 250GB drives
do not have a 500GB capacity. Instead, only 250GB is available for storage,
while the other 250GB drive is used to back up this storage.)
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