Mountvol creates, deletes, or lists volume mount points. Mountvol is a way to connect volumes without a drive letter.
Syntax
mountvol [Drive:]Path VolumeName
mountvol [Drive:]Path /d
mountvol [Drive:]Path /L
mountvol Drive:/s
Parameters
[drive:]path
Specifies the existing NTFS directory folder where the mount point will reside.
VolumeName
Specifies the volume name of the target volume for the mount location. The general form of the volume name is \\?\Volume{GUID}\, where {GUID} is a Globally Unique Identifier (GUID) (for example, \\?\Volume\{2eca078d-5cbc-43d3-aff8-7e8511f60d0e}\).
/d
Deletes the volume mount point from the specified folder.
L
Lists the volume name mounted by the specified folder.
/s
Only for Itanium-based computers. Mounts the EFI system partition on the specified drive.
/?
Displays help at the command prompt.
Remarks
If all available drive letters are used up, mount a local volume without a drive letter.
If you want to extend volume space without reformatting or replacing the hard drive, you can add mount paths to another volume.
If you use a volume with multiple mount paths, the advantage is that you can access all local volumes using a single drive letter (such as C:). Although users can mount local volumes and assign drive letters to them, they don't need to remember which volume corresponds to which drive letter.