use a drives guid instead of its letter - where is the drive root ?

Hello all,

Using XPsp3 :

I have an USB drive, which I want to refer to by its guid - so that if its 
drive letter changes (because of other USB drives) I can still dependently 
talk to it (from within a script).

The thing is, when I use the result of "mountvol.exe" I can access the 
contents of any folder on the drive, but not the contents of its root.

Question: what do I have to write/do to access its root (do a "dir" on it) ?


Reference:

https://superuser.com/questions/465730/access-to-a-disk-drive-using-volume-id-instead-of-a-drive-letter-in-windows

In the above the "start \\?\Volume{guid}\" method to open the drive doesn't 
work for me. However, "start \\?\Volume{guid}\foldername" does.

Regards,
Rudy Wieser