i use a moser baer CD_RW. i fill it in w/ MP3's. and there's some space remaining (like 20MB). after a few days, i try to add another song. but i cant: it says it cannot continue multisession because the cd is not rewriteable. i have to erase the whole cd and again put in the old songs along with the few new ones. cant i add the new ones w/o having to erase the whole thing? i use nero.