Hi all, I am a relative n00b when it comes to backing up DVDs, but I have a huge Doctor Who collection which I need to put away to save space. So I bought a 2TB HDD, and I have been backing them up using the readom command in Linux, i.e. straight DVD9 to DVD9 .iso copies. However, with nearly 60 disks to go, I am rapidly running out of space on the HDD, so I figured it might be an idea to compress the .isos. I'm not going to burn them to disk, so it's not an issue, I just need access to the .isos. So, my question is this: How much compression can I apply to a DVD .iso before quality loss becomes noticeable? I am using a 1080p HD TV as a monitor, if that matters. Even if I can shave a few hundred MB off the .isos, that would help some, but I want to preserve as much of the quality as possible. Also, what would be the best software for the job? As I said, I have so far been using Linux's readom command, and I have Handbrake and DVD95 installed. I also have access to a Windows PC, so if there are better options for Windows, I am open to them. Sorry for the long winded post, but any advice would be greatly appreciated!