I did some breif googling and was unable to find an answer, I may have just overlooked it. Does anyone know offhand how many can go on a dvd? I imagine it depends on how you burn it, ISO or UDF but I don't know for sure. This question came up when I was asked to back up an old mac hard drive so a guy could get the files off of it after a PSU failure, where it wasn't worth buying a new PSU (since the computer hadn't been used in years anyway). The hard drive was only 2 gig (yeh the Mac came from back when legal Mac clones existed) so it will fit on a single layer dvd. Just was wondering how many files could go on a DVD.. I'm sure its probably 10-100x the amount that were on the drive but I was curious.