in disk management do you see any info on the storage for the drive? if it says no media for example it seems the drive is dead and would need to be replaced. If you see unallocated you may be able to create a partition and format the drive.
Something gone wrong with the partition table , re-create the partition.
Just check in the list of paritions whether there is shownig any previous allocated space or unallocated space , may be he has unallocated the space , create the partition again of that unallocated space us minitool partition to check it system wont show it.