Thank you, everyone, especially AudioTrack!
I tried multiple recovery programs, like Disk Drill and AOMEI Recovery. Each recovered a few files, but not many. I finally purchased EaseUS Data Recovery Wizard Technician. As I mentioned above, it recovered about 771,000 files. Unfortunately, most of the ones I have tried to open are corrupted. Corrupted MP3s give a "Decoder not found for this format" error. I've tried opening them in WMP and VLC, and tried MP3 repair software but nothing has worked. Happily, a good many of my mixdowns were stored on a backup drive, but my BiaB files and Reaper files were not.
Live and learn, I guess.
Thanks again, everybody, unless someone has another suggestion...
Old Hippie
Last edited by Old Hippie; 09/29/22 07:42 AM.