I'm assuming this has something to do with the amount of space when formatted vs the amount of raw space but I'm going to ask anyway. I've got DVD+R's. Like other media they say they hold 4.7 Gigs but Nero won't let me write more than 4.5 gigs (unless I overburn). Is this normal? Also I heard DVD-R's hold more. If so how much more? Are they just as compatible with DVD players as the +R's are?