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I might confuse things with parity here, but does any of the RAID levels except RAID2 employ any means against silent bit corruption in the data? What about checksumming? I am not talking about hardware failures of any sort.

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RAID 3, RAID 4, RAID 5, RAID 6 all provide some sort of byte/block/bit striping and some sort of parity. –  Ramhound Dec 28 '11 at 16:44
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You have to consider where the bit flip will occur. If you're not using ECC RAM and a bit gets flipped before it is written to the array... –  Mark Johnson Dec 28 '11 at 16:55

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From Wikipedia:

RAID 2 is the only standard RAID level, other than some implementations of RAID 6, which can automatically recover accurate data from single-bit corruption in data. Other RAID levels can detect single-bit corruption in data, or can sometimes reconstruct missing data, but cannot reliably resolve contradictions between parity bits and data bits without human intervention.

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