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#21
You mean the source HD in question? You would be copying to an external (only) if that's not clear. For some reason it won't copy to USB if another USB drive is used to boot from. So I'd use the disk. Paragon might work better.
But there's 90% chance there will be no drive found during file rescue if it's not first detected in BIOS, so check your storage section there, if not detected change cables and check again.