OK, i have a Windows 7 installed on main drive, added a mirored array as d: and pinted windows to store my docs and everything on that drive in case of failure.
I did have a c: drive issue and had to reinstall windows 7 again, on completion i found that the "my documents" folder on the mirrored drive had just disappeared.
I'm not sure if it's a security feature or something, but my username is different now since reinstalling. Of course this data is important, i've tried showing hidden folders but to no avail.
Any help appreciated.