Got the extended ROTK for Xmas. Disc one has a 'scuff' mark on it. This isn't a scratch, as such, but it cannot be removed by buffing the disc. This doesn't appear to affect playback. Is this mark 'invisible' to the laser, perhaps? Yes, I should send it back but if it doesn't affect playback then what's the point (Internet gift from 'sendit', not shop, so extra hassle). Ta, Crispin.