You can plug the Win Audiophile drive into Mac: http://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=426743#Post426743

Make sure you use VLC or Media PlayerX as the default player on Mac to play the RealTrack/Drums and styles demos that are in wma format or convert them to m4a with http://www.nch.com.au/switch/index.html

X:\bb\RealTracks\Data
*X:\bb\MIDI SuperTracks - Demos
*X:\bb\RealTracks - Demos (if you are running the main app from the OS drive then convert that folder in /Applications/Band-in-a-Box/RealTracks - Demos).

*2018 has these folders in the X:\bb\Demos

This way the Audiophile drive will work on both Win or Mac.
Mac will need NTFS write enabled to write to the drive, you only need this to create usertracks or loops as it needs to create the .bt1 beat files.