You can buy DVD-RW discs that can be erased and recorded on over and over. It's easier to use a DVR such as Tivo thar records to harddisk.
DVD recorders
Does anyone know if you can record over a tv program or other video file on a DVD disc using a DVD recorder similar to what a VCR can do with a tape? In other words, you record a program with your DVD recorder, you watch the program, then you don't need it any longer so you want to re-record over the same part of that DVD disc. Anyone an expert on this out there?