Ah the problems of RAID 0. I lost alot of software due to both of my raid controllers having conflicts. Because there is no fault tolerance, you wont be able to recover anything if that drive goes.
In principal, you will NEED to replace that drive. It is a hardware fault that is delivering you this lovely message. If you can get hold of a HDD with the same specs - 80 GB 7200 RPM yadiyadiya then you it should be fine. However, to get this working again will take a bit of effort!
You need to take the *faulty* drive out of your pc, and ghost it onto a new drive. Add the new drive back into your array and that should work in theory. Otherwise, back up everything you need. Give a good old format (i love to format) get yourself a set of new drives and rebuild the o.s.
Format King aka drainedsoul