multi-session is what you have in mind. http://mp3.about.com/od/tutorials/ht/Multisession-Disc.htm
Does any one know if I take CD-R disk ( A.K.A. write once CD) I burn something and then run it through a "format" utility (ex. windows) Will I be able to use it again for burning it again a second (and third, and fourth) time?