Full Recovery Protocol
DEEP MAINTENANCE
No gig right now. We do this properly, once, so it never happens in a booth again.
If the computer offers to format or initialise the drive, say NO. On a Mac that means leaving "Initialize…" alone: it opens Disk Utility, one step from erasing everything we are here to save. Choose Ignore or Eject, then answer below.
When you plug the USB into a computer, can you see your files?
You follow these steps at your own risk. Full disclaimer.