I have two CD/RW (Phillips) discs that have files on them. I can open the files and play them (video and audio files) in W7/32 and Ubuntu 11. I want to erase/format the discs, however they are write protected. I have tried windows format (does not work), tried command prompt as administrator/ format and it started then came back with a message to make the disc invalid, I replied yes. However the format failed. Also tried changing 'read only' to 'archive' in the properties for the disc (access denied). Tried burning to the disc in Ubuntu, selecting blank disc as OK, but that failed too. I am stumped. Any suggestions would be appreciated.