was going to suggest Apple USB SuperDrive, but apparently it's not compatible with Macs that have built-in optical drives
When looking for optical drives keep the following in mind:
1. Some drives are powered by a usb cable that plugs into two USB ports. If you don't have enough ports to spare that second USB port the drive may or may not work with a USB hob. If the hub has a separate electrical power cord it will probably work with the optical drive.
2. Many of the drives that use two usb connections come with an external power cord for a few dollars more. I usually buy this cord. With it the DVD drive often works with only one USB connection. The external power cord is also helpful if for some reason the USB ports aren't providing enough power.
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@LB You're right. That second cable does help when actually burning discs. IIRC I tried it with my burner using only one USB connection and as you suspected high speed burning fails. It's possible that this fails on some burners and not others.