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dd-rescueorclonezillain rescue mode to back the entire disk up onto a new harddrive that you know is working. Only then should you bother with recovering data. If you know the disk is good and doesn't have issues (tested it fully on another system, no issues with it disappearing, etc.), then try to recover the data on that system because your current one might have a bad controller. But get the data off of an unstable medium/disk