A volume mountpoint is a drive or volume in Windows that is mounted to a folder in the NTFS file system.
A mounted drive is assigned a drive path instead of a drive letter. Volume mountpoints enable you to exceed the limitation imposed by naming drives using one of the 26 letters of the alphabet.. By using volume mountpoints, you can mount a target partition into a folder on another physical disk. For more information about volume mountpoints, see the Microsoft Web site.