You really are a saint! I'm pretty sure I've just deleted the partition somehow. Both RAID arrays are present and healthy and xp sees them as such, so I don't think this is a raid problem. I'll have a little rest and then try to recover my lost partition. I'll keep you posted. Thank you. UPDATE: Just analysing the drive in an attemp to recover the partition. I'm not sure if I overwrote it or just deleted it, hopefully the later. Will take a while to scan fingers crossed. ANOTHER UPDATE: I'd only deleted the partition, I have now successfully recovered it! Hurray! Thanks again for your excellent guide!