1 - /DISK

       /DISK[=device-name[:]]

    Specifies the disk whose quotas are to be examined. By default,
    the current default disk (defined by the logical name SYS$DISK)
    is examined.

2 - /USER

       /USER=uic or identifier

    Specifies which user's quotas are to be displayed. By default,
    the current user's quotas are displayed.