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#21
Can you run the PW Surface Test or wipe the disk with PW? If so and it passes/wipes, try creating a Logical partition to Check File System.
If not a last resort would be to determine the maker of the disk to run it's HD Diagnostic to determine its condition with certainty. Some like WD and Seagate will show a tab for each drive detected and allow diagnosing even a USB drive. Others will require the disk be installed internally, e.g. for an external into a laptop.