By checking this box, you remove all existing archives from the = view.status.LBU_MEDIA ?> when commiting (adding the '-d' flag to the commit action).
This needs to be done when you want/dont want to encrypt your archive and there already exists archives on the media.
There can only be one sort of arcive on the media.
If you dont remove existing apk.ovls from media, your commit will most likely fail.
end ?>