@A-pi said in ROMs from exfat USB drive, drive not automatically mounting on startup:

Incidentally, blkid still shows the drive (/dev/sda2)...?

blkid shows you the block devices detected by the system, but that doesn't mean they're mounted and available. The mount command should give you the list of mounted (and available) drives. I guess your drive is not automatically mounted at start or there's an error mounting the drive - check you by manually mounting it and see if any errors show up.