exFAT support on macOS seems to have some bugs because my external drives with exFAT formatting will randomly get corrupted.
Disk Utility is unable to repair this at first, but the fix is this:
- 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>
. egsudo fsck_exfat -d disk1s3
-d
is debug so you'll see all your files output as they're processed.- Answer
YES
if it gives you the promptMain boot region needs to be updated. Yes/No?
- Open Disk Utility and you should be able to repair here successfully.
See the apple man page below for details on the fsck_exfat
utility.
Sources/Extra Reading: https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man8/fsck_exfat.8.html https://craigsmith.id.au/2014/07/06/repairing-a-corrupted-mac-osx-exfat-partition/ https://discussions.apple.com/thread/4154638?tstart=0
Started with error
Checking volume.
** Checking main boot region.
fsck_exfat: Could not read boot region
** The volume could not be verified completely.
I've done all of the above with no luck. The latest error I get when I run diskutil verifyDisk /dev/disk2 is
Nonexistent, unknown, or damaged partition map scheme
If you are sure this disk contains a (damaged) APM, MBR, or GPT partition
scheme, you might be able to repair it with "diskutil repairDisk /dev/disk2"
I run diskutil repairDisk /dev/disk2 and get
Error repairing map: Input/output error (5)
Any suggestions?