I have just bought a Macally PHC-500B external enclosure to hook up my DVD RW to my Mac Mini. I got two other optical drives to work in it. A CD-RW and DVD-ROM both worked. I have a Macally PHR-100AC 3.5" HD enclosure. I took out the drive and hooked the DVD RW up to it. It worked fine connected throught the firewire port. Still nothing when hooked up to the mini through USB. Has anyone found a way to use USB. The DVD-RW is a BenQ DW800.