J Just Well-known member Joined Jan 16, 2016 Posts 46 Mar 24, 2020 #1 Hi! How-to repair an exFAT volume, which was formatted as a single block device, i.e. without a partition table? The whole volume is used by exFAT, there is no MBR nor GPT on it. The volume reports an "invalid VBR checksum", and cannot be mounted (it is not attached to any drive letter). Should I use Chkdsk.exe to repair the volume? How to do it, with the volume not attached to any letter? Thanks.