For some reason Windows Explorer and everything else dependent on it runs very slowly and the cursor stutters whenever there is nothing in the DVD burner. There is no problem when a CD or DVD with data is in the drive. It is as if the drive is waiting on a disc. Disabling the drive also (temporarily) solves the problem. I never had such problems with IDE optical drives, but this system is all SATA now. Has anyone a similar experience and ideas towards resolution? Thanks.