...burn? recently my burnt a mp3 songs in cd., i tried to keep them in my HDD but those are not copying why? i seen the extension that .cda wht is this type format? how cani keep them in my HDD? if i also want to put same what my friend did to me next time while burning a cd means how can i do it? is there any copy right protection available in nero (how) and other than nero softwares(name, how)....what is menat my ISO ?what is it's use wher this option is avialble in the nero and other burning softwares ? i waitng for ur reply