I bought new disks, Verbatims from singapore (they're supposed to be the best) and every disk I've tried burned to completion. But when I try to verify, about half disks failed verification. About 3/4 of the disks that failed failed at 50%, others failed at around the 90% mark. But they all still work when I put them into my Xbox (games play fine as far as I can tell). What should I do now? Get a new burner?