Can I specify a default USB 3.0 BD Drive?

[mkvgrub]

I have two BD drives (external, in USB 3.0 enclosures). I want to run two instances of MakeMKV and specify each instance uses only one of the BD drive by default. I had it set up that way on my 2009 Mac Pro (died), but do not seem to be able to do that with my new iMac. If I don't when I open the second MakeMKV it starts scanning the BD that's being uploaded vie the 1st MakeMKV...

[Woodstock]

In Preferences->IO, make sure that "Ask for single drive mode" is checked. Restart MakeMKV, and it will ask you if you want this instance to monitor "all" drives, or specific ones.

[mkvgrub]

Thanks! That did the trick. Amazing what I'm able to forget if I don't do a function for 8 years.