I just installed an Iomega RW external drive with the Hot Burn software supplied. Once I burn data or pictures on a new RW CD I cannot add additional data. The disc shows full even though it is a 700MB disc when there is only a fraction of that amount stored, also I cannot reformat the disc without distroying the disc. My system is xp2000. I have tried everything I can think of, but once I write to the disc I can't add to it or erase what is on it. I am using Memorex CD-RW 4X muti speed disc.