Repair exFAT partition under Win/mac

Under Windows:
Do not use disk repair, you will be prompted to format first.
Administrator, open the command line (CMD) and enter the following code:

1. chkdsk {drive}:/F
2. For example: Chkdsk e:/F means repair E-drive

Under Mac:
The process is slightly more complex, first try to fix it with your own disk Utility, if you do not successfully follow the steps below.
Open Terminal, enter:

1. sudo fsck_exfat-d diskxsx
2. Here DISKXSX represents the partition to be repaired, such as DISK0S4

A list of files will appear, and the last hint:

1. Main boot region needs to is updated. Yes/no?

Enter Yes.
Finally go back to disk Utility to repair the partition, this time will be successful.