Hello, I'm new here as well as fairly inexperienced at backing up data on DVD. I was trying to backup 3.77 GB (4,057,276,416 bytes) of files and the first time I did it worked fine. I tried to make a second backup and it tells me I still need 98.8 MB to fit the rest onto the disc which has zero of 4.38 GB of space left. I am using a SONY DVD-R. I just copied the files to my hard drive into a folder and then copied the files onto the DVD-R. As I said before it worked fine the first time onto the same disc with the same method, but now after ruining a few discs I need help with why or possible suggestions on how to fix this? I don't understand why 3.77 won't fit onto 4.38 again. Any help is appreciated. : ) I'm sure there is some stupid reason that I'm missing, but I am pretty dumb when it comes to this. Thanks.