How many DVDFab windows can I have going at the same time?



I have 3 USB drives that I use. I put in the DVD’s and bring up 3 DVDFab windows and configure each movie and hit Start, come back in an hour and repeat… My question is, how many can I do at the same time? I was going to buy a few more drives, say 3 more, so I can do 6 at a time - is there a hard limit?

I am using Vista 64-bit w/ 8GB ram


I’ve never tried more than 2 at once. I think this would be classified as an unsupported feature. The probable bottleneck would be the in the (hardware) USB controllers.