RAID level 2 is capable of recovering from transient mistakes that go undetected as well as from drives that have crashed. RAID level 2 will fix it if one disk sends a single faulty bit, but RAID level 3 won't.
What Does RAID 2 Mean?
RAID 2 is yet another arrangement at the RAID standard level that provides exceptionally fast data transfer speeds. By having a central controller rotate the disks at the same angular orientation, the disks in RAID 2 are synchronized so that they all arrive at the index at the same time.
What is RAID level 3?
The RAID configuration known as RAID 3 stores the data produced by a RAID controller on a parity disk rather than striping it with the data. RAID 3 struggles to handle a large number of tiny data requests since the parity information is stored on a different drive.
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