I'll argue the point that both CD and DVD have now passed into everyday usage as they are and as such therefore are no longer seen as being acronyms so the use of an apostrophe is incorrect.
(incidentally, with DVD it could be argued that it never was an acronym as it's never been stated in the official standards that it stands for anything at all it is just referred to as DVD all the way through)
Sorry jj, have been away from AB for a while, I too would have argued that if it was due to abbreviation it should be D'V'D's! I'm not a grammar and punctuation genius (as pointed out by Chris!) but things like that do make me go 'grrr'! What I did find amusing was in a restaurant where they offered 'Firm chocolate mouse' on the desserts menu!
Oooh, I'm surprised that Chuck doesn't know the difference between an acronym and an abbreviation. (An acronym is an abbreviation where the composite letters form a new word, as in 'NATO').
I know the difference, but in this instance half my point was that the abbreviation for compact disk (CD) has now pretty much become a word in itself so is now more of an acronym than an abbreviation.
Strictly speaking it could be called an initialism, but thats far too americanized (sic) for my liking.