[QUOTE=Complication;57677]Warning: This is not a DVDFab sanctioned or supported activity.
Having said that, here is what works for DVD (sorry I don't have multiple BD drives):
Make sure all discs are in the drives and show up in Explorer before starting the first DVDFab (turn off auto-start if enabled). Start first DVDFab as normal and begin rip. Start second DVDFab, click cancel once and it will jump to the next drive, start rip. Start third DVDFab, click cancel until correct drive is selected (this may be once or twice), start rip. You must wait for all DVDFab instances to finish, close all of them, and then insert new discs to repeat the process.
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Thanks, I'll give t a try.