Toast would have to see the drive IN the enclosure, via the adapter card. So the driver for the adapter card is important, plus the mechanism in the box must be Toast supported. So, go to the manufacturer's web site and see if they have a Mac driver. If not, it is made to use with Windows. OR find out who made the converter card (inside) and go to THEIR website (maybe in Taiwan) and download a driver. Not many of the converter cards will support CDRW via USB, but you can still look for drivers. You can try versiontracker, too.