Tente isso no prompt de comando:
subst f: c:\
C:\>dir f:
Volume in drive F is System
Volume Serial Number is 1234-5678
Directory of F:\
06/10/2009 10:42 PM 24 autoexec.bat
12/05/2009 02:07 AM <DIR> Boot
06/10/2009 10:42 PM 10 config.sys
02/16/2011 10:04 AM <DIR> Program Files
02/18/2011 04:31 PM <DIR> Users
01/03/2011 09:57 AM <DIR> Windows
2 File(s) 2,093 bytes
4 Dir(s) 104,560,091,136 bytes free
C:\>