If you create a mapping on removable media, X:, change to X:\Folder1\Folder2\Folder3, and delete the mapping with net use X: /d, when you remap X:, the beginning path is X:\Folder1\Folder2\Folder3 instead of X:\.

NOTE: This happens on all removable media drives.

NOTE: This behavior will be fixed in Service Pack 1 (SP1).