On Wed, 30 Nov 1994, Paul Ste. Marie wrote:
There is a commonly-held belief that there is a US government standard for declassifying magnetic media which involves overwriting it three times. In fact this method is for declassifying core (computer memory) rather than magnetic media. The government standard for declassifying magnetic media probably involves concentrated acid, furnaces, belt sanders, or any combination of the above.
For magentic media, which includes core :), I believe the standard is overwriting the info alternately with 0's and 1's 100x.
Paul
Close contact with a thermite gernade is the standard most agencies I know of follow. 073BB885A786F666 nemo repente fuit turpissimus - potestas scientiae in usu est 6E6D4506F6EDBC17 quaere verum ad infinitum, loquitur sub rosa - wichtig!