I had a relatively minor issue solved today at the Genius bar and as standard process they ran a bunch of disk utilities on my machine to make sure there were no problems with it. They said the disk was fine. But I noticed after I had left that one of my partitions didn't mount - my exFAT data partition. In looking at Disk Utility the partition doesn't pass verify. Verify shows... Invalid sector size: 0 Error: This disk needs to be repaired. Click Repair Disk. ...But it also shows it as Format: MS-DOS (FAT) Does anyone have an exFAT partition they wouldn't mind checking the Format description? I bet it should say exFAT rather than FAT. Also, anyone think I should click "Repair Disk"? Any other advice? Yes there is some data on that drive which is not currently backed up.