Originally Posted by
chazus
Sooo yeah. You don't understand how RAID works. That is why you don't get it.
RAID 0 is striping the logical drive across multiple drives. There is no redundancy. If one drive fails, ALL data across ALL drives is lost.
RAID 1 is mirroring. It is slightly slower, as data is written identically to multiple drives (usually just 2). If one drive fails, the other seamlessly continues on, allowing you to replace the failed drive.
RAID 5 is using parity across multiple drives, so if one fails, data is retained. Minimum 3 drives.
RAID 10 is basically just striping two drives, and then mirroring those two drives to two more.
There are others in different ways, but those are the most common. Using a RAID in no way increases, or decreases the chance of a drive failing. The point is that two drives using one partition have, technically, a higher chance of failing than one drive over time.