I don't have the experience, but I can tell you off the top of my head about two problems that you may have.
1) The Green drives are slow drives. It's much simpler, and safer for your data, to buy one fast drive instead.
2) These are consumer drives. There is a well-known problem where consumer drives appear to the RAID controller as if they have dropped out of the configuration, because they take time to handle an error themselves and the RAID controller is expecting a faster return telling it to handle the error. See http://en.wikipedia.org/wiki/TLER
for a bare-bones overview.