SUBST drive1: drive2:]path SUBST drive1: /D drive1: Specifies a virtual drive to which you want to assign a path. drive2:]path ...

SUBST [drive1: [drive2:]path] SUBST drive1: /D    drive1:        Specifies a virtual drive to which you want to assign a path.   [drive2:]path  Specifies a physical drive and path you want to assign to                  a virtual drive.   /D             Deletes a substituted (virtual) drive.  Type SUBST with no parameters to display a list of current virtual drives.