LABEL [drive:][label]
LABEL [/MP] [volume] [label]

drive:

Specifies the drive letter of a drive.

label

Specifies the label of the volume.

/MP

Specifies that the volume should be treated as a mount point or volume name.

volume

Specifies the drive letter (followed by a colon), mount point, or volume name. If volume name is specified, the /MP flag is unnecessary.