I have a lot of music and video files that I have been trying to compress to save room on my drive and make it easier to make backups of, but I can't seem to get a compression ratio better than 98%. Does anyone know of a good file compression program (preferably free) that works well on video/music files. As a side note I would like to compress many individual files into one archive and the groups of files can be really large (so fare my largest group is ~40gb). Thanks in advance.