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Due to the microscopic nature of current HDD internals this may no longer be possible... I once witnessed an 8" 12MB HDD having most of its data recovered after being "security wiped" with several passes of 0's, then 1's bit patterns. This may have been pre-RLL or RLE. I do not remember if the method employed had a name, which makes it difficult for me to ...


20

The reason you write '0' instead of '1' has to do with the way magnetic storage encodes the 0 and the 1. a long explanation of it can be found on Wikipedia under Run-length_limited. In short RLL is the methodology used to store the '1' and '0' and it is more complex than just to store the bit values themselves. On a side note to make the drive more like it ...


1

Drives, especially flash based ones like SSDs, thumb drives and flash cards don't write single bits, they write whole blocks of a larger number of bytes. You'd have to rewrite all blocks not containing only zeros anyway, or might ending up rewriting a block multiple times, once for each "one" in there. Worse, because of wear leveling techniques you can't ...



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