What's on his C disk now - could it be a different, non-FAT32 format?.
Try running FDISK first, to rest any corrupt partition parameters, of try the manufacturers "zero-fill" program to rest the drive back to "factory-state".
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?