Two drives are RAID 0 or 1, Three minimum for RAID 5. Why:
Raid 1 is a mirror. 1 drive worth of data with two drives involved.
Raid 5 is a parity drive. One drive holds the parity information (alright, it's spread across multiples, but let's keep it simpler). That means to have parity you need more then one drive for the third drive to have purpose. A 2 drive RAID 5 simply means that you've got one disk doing data storage, another doing parity... equivalent of a RAID 0 with two drives... with more overhead.
Edit: Sorry, swapped 0 and 1 in my head. Moral: Do not post technical data without doublechecking after a long night at the bars.
- Craig Farrell
Never stop learning, even if it hurts. Ego bruises are practically mandatory as you learn unless you've never risked enough to make a mistake.
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