1 of 2 HDDs "failing" in a RAID 0 setup, next step? help

I have 2 x 74GB Raptors at RAID 0. My Intel Matrix Storage Console reports that one of my hard drives has an error and may fail. But everything is functioning OK after numerous reboots and a power off and on. I downloaded Western Digital's Data Lifeguard Diagnostics software, which reports that the capacity of the physical drive is 4GB?!?! It then ran the test for only 2 minutes and said everything was ok. Does anyone have a suggestion or tip which step I should take next to determine if my HDD is really dying?

Should I format the HDDs and delete RAID and reinstall my OS on the one that is "failing" to see if boots up? Or should I use some disk checking software to scan for bad sectors or errors? If so which software? SPinRite.. etc?

S.M.A.R.T is unavailable due to RAID 0.

Thanks.