Is there a program out there that can search a volume, and then tell you what files/folders in that volume would compress very well? Some files, like text files, aren't compressed and when they are compressed, the compressed file would be a lot smaller. Other files, like music and video files, are already compressed and compressing them would barely make a difference. It would be nice if there was a program that would do that. It would be helpful to open some space on one's storage drive. If nothing like this exists, then it should! If you're a developer or you know a developer, take this as an idea! P.S. Do iMovie project folders compress well?