Quote: magnetic force microscopy can read everything ever written to a magnetic disk

Quotation Skeleton

Faced with techniques such as [Magnetic force microscopy], truly deleting … is written to the medium, the write head … the actual effect [of writing a one] is closer to obtaining … is overwritten with a one. … The recovery of at least one or two … head electronics with a high-quality digital sampling oscilloscope, … recorded signal. … Using MFM, we can go even further than … [by reading the remnant magnetization at the track edges]. … [p. 79] When all the above factors are combined … that the contribution from each "layer" gets progressively …   Google-1   Google-2

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