V (Volume Shadow Copy Service)
A logical storage unit. A volume is the target of shadow copy creation operations.
volume GUID name
A unique name for a volume. A volume GUID name is a string of the following form:
(note the trailing "\") where GUID is a globally unique identifier for the volume. The operating system assigns a volume name when it first encounters a volume, for example, during formatting or installation.
Note that a volume can have more than one volume GUID name.