Can we recover overwritten data from a HDD? Does magnetic microscopia work?

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I found articles over the internet that sustain the idea that it is possible to recover old data from magnetic supports that has been overwritten using magnetic microscopia method. Do you have any idea if this can be done?

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Answered By 0 points N/A #94767

Can we recover overwritten data from a HDD? Does magnetic microscopia work?

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It was known earlier that overwritten data cannot be recovered, but, Peter Guttmann, a computer scientist, showed that the use of magnetic force microscope can really recover overwritten data to some extent. Magnetic force microscope (MFM) is a mixture of an atomic force microscope.
 
Such microscopes work on magnetic dipole-dipole interaction. Solid-state drives (SSD) overwrite data more various than the hard disk drives (HDD) makes recovery of most the data easier. Flash memory is used by most SSDs in order to store data in blocks and pages referenced by logical block addresses (LBA) that are managed by the flash translation layer (FTL).
 
Make sure that the hard disk is not damaged, if not, then the entire data will be missing. You have the option to overwrite the data but some layer of the Hard Disk will contain a magnetic layer.
 
This is an excellent invention.
 

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