My NEC 1300a can't seem to burn at 4x. I use Nero 5.5.10.35 and it tells me that I'm burning at 4x but the total time it takes to burn is about 25 minutes. That means that it's burning at about 2.4x. I've tried ritek and pioneer discs. Nero says both are burning at 4x but it still takes 25 minutes. Anyone else have a similar problem or know how to fix it. thanks.