MacOS Setup
My setup of MacOS that suits my needs.
Fix corrupted exFAT disk
In Disk Utility, ensure that the drive is not mounted, eject it if it
is mounted. Use diskutil list to find the right drive id.
You want the id under the IDENTIFIER column, it should look like
disk1s1 Run
sudo fsck_exfat -d <id from above>. eg
sudo fsck_exfat -d disk4s2 -d is debug so
you'll see all your files output as they're processed. Answer YES if it
gives you the prompt Main boot region needs to be updated. Yes/No? Open
Disk Utility and you should be able to repair here successfully.