On 01/07/2016 09:36 AM, Fred Cisin wrote:

I've heard that there are "standards" for a number of overwrites, and
 what patterns to use, . . .

The paper that got the most notice was from Peter Gutmann from the early 90s.

https://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html

--Chuck

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