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FAST Mode (RAID 0/Striping)
FAST mode it's also our familiar RAID 0 mode. In RAID 0 state,
data storage is divided into two parts, respectively in two hard disk
storage, then the theory storage speed of hard disk is twice the one
of single block hard disk.
The actual capacity equals to twice the smaller capacity of the one
hard drive (between the two hard disk). The deficiency of RAID 0 is
that any piece of hard disk is failure, the whole RAID on data will
not be restored.