He and his colleagues ran a scientific study to take a close look at hard disks of various makes and different ages, overwriting their data under controlled conditions and then examining the magnetic surfaces with a magnetic-force microscope. +Craig Wright, a forensics expert, claims to have put this legend finally to rest. +The myth that to delete data really securely from a hard disk you have to overwrite it many times, using different patterns, has persisted for decades, despite the fact that even firms specialising in data recovery, openly admit that if a hard disk is overwritten with zeros just once, all of its data is irretrievably lost.+ +*Secure deletion: a single overwrite will do it*+ I understand your concern, but just for anyone else reading this thread:
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