RAID 0:
Data is striped across drives; no data redundancy is provided.
RAID 1:
Data redundancy is obtained by storing exact copies on
mirrored pairs of drives.
RAID 2:
Data is striped at the bit level; multiple error-correcting
disks provide redundancy; not a commercially implemented
RAID level.
RAID 3:
Data is striped at the byte level, and one drive is set aside
for parity information.
RAID 4:
Data is striped in blocks, and one drive is set aside for
parity information.
RAID 5:
Data is striped in blocks, a
nd parity information is rotated
among all drives on the array.
On The Levels
