I have a related problem. I was running a windows server 2008 r2 that had six drives total in use. I moved the page file, mem dumps, and some other files off the main os drive per Microsoft's BPA.
Fast forward a few months; I tried windows server 8 Beta, and really like it so far, so I am trying to format the old drive that had the old page/log/misc files on it and no longer need, but I can't... Not through diskpart with override or noerr, and not through windows explorer, and not through server manager/files and Storage Services.s
If I find the answer, which I will eventually, I'll post the results here. If someone beats me to it I'd be super thankful.