How do I check SMART status on IRST RAID 5?

Hi,

I'm running Windows 7 64-bit and using IRST to build a RAID 5 out of five 2TB disks.

At least one disk is bad, but IRST reports them as fine. Every few times I boot up IRST "verifies and repairs" the RAID array. This takes about 24 hours.

I would like to check the SMART status of each disk to see if there is one that is going bad so I can replace it.

I tried to use HD Tune, but it can't see the individual disks. It only sees the array.

How do I see the SMART status for each disk in an IRST RAID 5 array?

Thanks,

John