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Hardware Troubleshooting
How do I securely wipe data on a laptop with a SSD ?
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<blockquote data-quote="RoboMan" data-source="post: 665876" data-attributes="member: 53544"><p>On my HDD i always perform secure erases, but i really find Guttman algorithm or similar <u><strong>unnecessary</strong></u>. A couple of passes will make the data unrecoverable mostly. 35 passes is a waste of time and writes. Correct me if i'm wrong. I've even contacted Data Recovery Companies to prove my point and they told me that in most cases, after 2 passes they're not able to recover any data.</p><p></p><p>EDIT: i was able to find this quote on the web:</p><p></p><p>"Gutmann himself has responded to some of these criticisms and also criticized how his algorithm has been abused in an epilogue to his original paper, in which he states:<a href="https://en.wikipedia.org/wiki/Gutmann_method#cite_note-Gutmann-1" target="_blank">[1]</a><a href="https://en.wikipedia.org/wiki/Gutmann_method#cite_note-security-and-usability-2" target="_blank">[2]</a></p><p></p><p>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. As a result, they advocate applying the voodoo to <a href="https://en.wikipedia.org/wiki/Partial_response_maximum_likelihood" target="_blank">PRML</a> and EPRML drives even though it will have no more effect than a simple scrubbing with random data. In fact performing the full 35-pass overwrite is pointless for any drive since it targets a blend of scenarios involving all types of (normally-used) encoding technology, which covers everything back to 30+-year-old <a href="https://en.wikipedia.org/wiki/Modified_Frequency_Modulation" target="_blank">MFM</a> methods (if you don't understand that statement, re-read the paper). If you're using a drive which uses encoding technology X, you only need to perform the passes specific to X, and you never need to perform all 35 passes. For any modern PRML/EPRML drive, a few passes of random scrubbing is the best you can do. As the paper says, "A good scrubbing with random data will do about as well as can be expected". This was true in 1996, and is still true now.</p><p></p><p>— Peter Gutmann, Secure Deletion of Data from Magnetic and Solid-State Memory, University of Auckland Department of Computer Science."</p></blockquote><p></p>
[QUOTE="RoboMan, post: 665876, member: 53544"] On my HDD i always perform secure erases, but i really find Guttman algorithm or similar [U][B]unnecessary[/B][/U]. A couple of passes will make the data unrecoverable mostly. 35 passes is a waste of time and writes. Correct me if i'm wrong. I've even contacted Data Recovery Companies to prove my point and they told me that in most cases, after 2 passes they're not able to recover any data. EDIT: i was able to find this quote on the web: "Gutmann himself has responded to some of these criticisms and also criticized how his algorithm has been abused in an epilogue to his original paper, in which he states:[URL='https://en.wikipedia.org/wiki/Gutmann_method#cite_note-Gutmann-1'][1][/URL][URL='https://en.wikipedia.org/wiki/Gutmann_method#cite_note-security-and-usability-2'][2][/URL] 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. As a result, they advocate applying the voodoo to [URL='https://en.wikipedia.org/wiki/Partial_response_maximum_likelihood']PRML[/URL] and EPRML drives even though it will have no more effect than a simple scrubbing with random data. In fact performing the full 35-pass overwrite is pointless for any drive since it targets a blend of scenarios involving all types of (normally-used) encoding technology, which covers everything back to 30+-year-old [URL='https://en.wikipedia.org/wiki/Modified_Frequency_Modulation']MFM[/URL] methods (if you don't understand that statement, re-read the paper). If you're using a drive which uses encoding technology X, you only need to perform the passes specific to X, and you never need to perform all 35 passes. For any modern PRML/EPRML drive, a few passes of random scrubbing is the best you can do. As the paper says, "A good scrubbing with random data will do about as well as can be expected". This was true in 1996, and is still true now. — Peter Gutmann, Secure Deletion of Data from Magnetic and Solid-State Memory, University of Auckland Department of Computer Science." [/QUOTE]
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