About CDs you can record on?

Question

This is probably a dumb, obvious question, but once you've burned a CD, can you re-do it? In other words, can they be used again? How? And why can't you use a blank DVD to burn a longer CD? Or can you? How?

Answer 1

If, by re-do it, you mean recording over existing data, you'll need a CD-RW. A regular CD-R will not allow you to write over data that's already been stored on it. I don't have any idea about the recordable DVDs, though.