As a result, they advocate applying the voodoo to PRML and EPRML drives even though it will have no more effect than a simple scrubbing with random data. “In the time since this paper was published, some people have treated the 35-pass overwrite technique described in it more as a kind of voodoo incantation to banish evil spirits than the result of a technical analysis of drive encoding techniques. Therefore, Gutmann felt obliged to address both in a blog post from 2001: So today we have around 24 different sanitation methods that will please just about anyone under the Sun and even if you are not satisfied with that our KillDisk offers users to create their own custom method that can outdo even Gutmann.īut what about the Gutmann method and is it still relevant today? After new technology of storing data came to be the Gutmann method was obsolete but was kept alive as the “ultimate tool for data sanitation”, so professor Gutmann and his method became targets of both of ridicule and admiration. Every government, starting with the US to UK, Canada, Russia, Germany and even Australia wanted its own standard as well as the vast majority of their own security agencies. The Cold War might have been over in those days but armament race in creating a fool proof sanitation method had just begun. So, to combat this apparent threat Professor Gutmann proposed a method that will require 35 passes. In those days, different types of magnetic media were used for storage than those that we use today, so Professor Gutmann was concerned that Magnetic Force Microscopy (MFM) a higher resolution technique for imaging magnetic patterns can be successfully used in recovering data after the data sanitation methods from those days have been implemented (as he explains in his blog he demonstrated that it was possible). Guttman method was first introduced in 1996 by Peter Gutmann from Auckland University New Zealand in his paper “Secure Deletion of Data from Magnetic and Solid-State Memory”. However, since our KillDisk does support Gutmann we find that some explanation is necessary, otherwise “why put something there if you are not using it?”. Many of our novice or semi-advanced users of our software have asked us about the famous or infamous Gutmann method and whether is it truly required for disks to be overwritten 35x for data to be securely sanitized once and for all? If you have read our blog on how to delete data you already know that US DoD 5220.22-M or any other method that has 3 passes is good enough for data sanitation.
The Gutmann method or do you really need to overwrite your drive 35x to be safe?
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