My brother upgraded to 10.1 today. Unfortunately, his non-OS X partitions were all hidden; still, by using GetFileInfo and SetFile, I was able to show and access all the missing partitions.
That is, all the partitions except the one named slash ('/'). While SetFile seemed to work on '/Volumes/\/', I still couldn't access it. After much headache, we found that we could access it in the Terminal or "Go To Folder" by typing '/Volumes/:'. Apparently, the pathname separator character differences between HFS+ and UNIX are to blame...thankfully, not so hard to overcome, at least on the Desktop level.
[Editor's note: Glad you got this one resolved ... I must admit, this is the first I've heard of someone naming their hard drive '/' ... I think I'll be sticking to letters and numbers for my volumes names!]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20011126232827311