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Posts Tagged ‘Disk erasure’

Hard drive recovery – peeling back the layers

“How many layers of data can you go down on a hard disk drive?” was the question over the phone. Not really a silly question, there is so much mis-information about how hard it is to erase data from hard drives, and how “data-can-be-recovered-even-after-the-platters-have-melted” (possibly the latter is a slight exaggeration).

It is worth debunking the myth quickly. With a hard disk there is a single layer of recordable material on each side of each platter. When an area of this disk is written to, whatever was at the area previously has gone forever. No need to write over it seven times, no need to sandblast the disk.

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