Since I don't play enought with CDs, I still can't keep it straight in my head. Coming from a floppy disk background..... CD-R = WRITE (burn) ONCE and you are DONE. - Is this true? - What about left over space on the disk? Is that just lost when you do the burn? CD-RW = Write Many times (until disk fails). - Is this a limited equivalent of the old 3.5" floppy disk? - What about left over space on the disk? - Can you add to the disk after the first burn, or do you overwrite the previous information? Thank you.