Can Nero 6 add files to a CD-W previously burned?
Hi and Welcome!
Yes, if multisession was enabled for that disc. You might have a look at the tutorials on www.nero.com to learn more about that.
I guess that’s not possible with a CD-R?
^ It is possible if you use multi-session and the disc has not been closed (finalised). Otherwise, no.
Only possible with [B]CD-R[/B] started as Multisession Disc.
If the CD-R disk has been ejected, it has been closed, right? That is, is there any way to eject the disk without closing (finalizing) it?
A disc has been closed after it were FINALIZED (fixated).