how to enumerate all drives on Win32?

[skip at pobox.com]

For a file/directory browser I need to be able to traverse all mounted
filesystems.  This is no problem on Unix systems, because we have the studly
mount(2) system call and thus have a single directory tree rooted at /.

Alas, Windows (once again) is broken in this regard.  I need to know how to
enumerate all the drive letters that have something mounted on them.  I
didn't see anything in the ntpath module that looked like it would do the
trick.  Any suggestions?

Thanks,

-- 
Skip Montanaro (skip at pobox.com)
(847)971-7098