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Should I replace the 4tb?
Oh ok much thanks. The 3tb I just got, there's nothing on it. Should I replace the 4tb?
You have 1 single sector that the drive lost data on it. This may be just an isolated media defect and not related to your heads going bad. Test your drive with a program that writes data to the drive (as much as you can) then verifies that the data was written correctly. If there is no valuable data on this drive I recommend running a 4 pass badblocks (available on a lot of linux live cd/d vd/usb sticks) read / write test. If this reports any errors I would not use the drive any more.