Hello Listers, In various ads, I have noticed there are cd-r cd +r as well as dvd-r and dvd+r What is the difference between a cd -r and cd +r? I have just recieved an old HP writeable cd and wondered how I know which types of cd to write on it with and how I am supposed to know what the machine will acccept. Thanks PCBUILD maintains hundreds of useful files for download visit our download web page at: http://freepctech.com/downloads.shtml