I have some educational dvd's that I use (as a professor). They are not copyprotected and I have permission to reproduce for classroom use. I hate carrying all the dvd's with me and having to switch them in and out. So; I created a virtual drive and used dvddecrypter to save iso files to hard disk. Works great, but uses lots of disk space. Would it make sense to shrink these files with dvd shrink as long as I get the quality I need? I know shrink can compress dvd-video and reauthor, but will it work with just the iso files? What other progs would compress iso files? Thanks.