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Edit: I went into Advanced and pressed Boot and discovered that any drive needs a boot record -- but upon looking it appears that the backup and main boot records are identical -- See attachment 1. Then I said anyway to rewrite the sector and it said it could not open file system, seems damaged. ??

I have an external TB data drive. The other day, it wasn't showing up in Computer, so I turned it off for a few seconds and turned it back on. It was detected, but the entire drive was empty. I wasn't told that the drive was unformatted -- it was accessible, just empty.
I did a recovery scan with ...