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present, this field specifies the media volume that the disc is contained on. If the volume of a given packages is different than the current volume of mediaDevice, then the user is prompted -- "This is disc #%d. Package %s is on disc #%d\n" "Would you like to switch discs now?\n" If the user selects yes, then DEVICE_SHUTDOWN is called and the user is then prompted -- "Please remove disc #%d from you drive, and add disc #%d" This works well for a carefully crafted INDEX file, but more work needs to be done to sort dependencies on a given package based on the volume that they reside on, to minimize the amount of disc flipping required of the user. This commit is a no-op for normal INDEX files and FreeBSD CDs. These additional features are only used if the INDEX and cdrom.inf file have multi-volume support.