What you are hearing from several users here is to choose the install option to put the program on your computer's internal hard drive, then go into the program and specify that the RealTracks and RealDrums be loaded from the PG Music external drive.

The performance should be fine.

The largest component of BIAB, by a huge margin, is the RealTracks folder. Then, about 1/10 the size, the RealDrums. The rest of /bb is not so large it can't be installed to your boot drive.

I'm using an SSD drive as my boot drive with the BIAB program, and have the RealTracks and RealDrums alone on another internal drive. The performance is amazing. Plus, this leaves my PG drive as my backup, which I keep in storage. So, there are several ways to set this up that work.

Although all work together of course, I think your CPU (processing speed) is more important in the speed of regeneration of BIAB songs than your hard drive access speeds.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.