Date: Thu, 10 Oct 2024 12:07:36 -0600 From: Chris Craft <ccraft@netgenius.org> To: questions@freebsd.org Subject: Fwd: How to zero a failing disk drive before disposal? Message-ID: <479ed045-10df-4ab7-86aa-76e37b7d1e4e@netgenius.org> In-Reply-To: <f02a133d-276a-4511-bfc9-8e6bebbd6b59@netgenius.org> References: <f02a133d-276a-4511-bfc9-8e6bebbd6b59@netgenius.org>
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This is a multi-part message in MIME format. --------------5VnU5omhsB4kEsvvGNm08QVO Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit The message was intended to go back to the list... (Sorry, Matt!) -------- Forwarded Message -------- Subject: Re: How to zero a failing disk drive before disposal? Date: Thu, 10 Oct 2024 10:19:03 -0600 From: Chris Craft <ccraft@netgenius.org> To: Matthew Seaman <matthew@FreeBSD.org> I was going to mention "Curie point", but this seems to be a complex topic. (Forum discussion: https://www.overclockers.com/forums/threads/what-is-the-curie-point-of-hdd-magnetic-platters.454159/ ) I think you'd be just fine putting it in the oven on the cleaning cycle (about 550F). -C On 10/10/24 10:13, Matthew Seaman wrote: > On 10/10/2024 16:17, Ralf Mardorf wrote: >> Someone might have the skills to extract data even after the plates have >> been shredded and fused into a lump. > > The Néel temperature for steel is typically somewhere around 200 -- > 500 ºC depending on the alloy. Steel that is hot enough to "fuse into > a lump" will need to be significantly hotter than that -- nearly at > the melting point. All of the magnetic information will have been wiped. > > Other ferromagnets useable for magnetic recording are going to behave > similarly. > > Cheers, > > Matthew > --------------5VnU5omhsB4kEsvvGNm08QVO Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit <!DOCTYPE html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body> <p>The message was intended to go back to the list... (Sorry, Matt!)<br> </p> <div class="moz-forward-container"><br> <br> -------- Forwarded Message -------- <table class="moz-email-headers-table" cellspacing="0" cellpadding="0" border="0"> <tbody> <tr> <th valign="BASELINE" nowrap="nowrap" align="RIGHT">Subject: </th> <td>Re: How to zero a failing disk drive before disposal?</td> </tr> <tr> <th valign="BASELINE" nowrap="nowrap" align="RIGHT">Date: </th> <td>Thu, 10 Oct 2024 10:19:03 -0600</td> </tr> <tr> <th valign="BASELINE" nowrap="nowrap" align="RIGHT">From: </th> <td>Chris Craft <a class="moz-txt-link-rfc2396E" href="mailto:ccraft@netgenius.org"><ccraft@netgenius.org></a></td> </tr> <tr> <th valign="BASELINE" nowrap="nowrap" align="RIGHT">To: </th> <td>Matthew Seaman <a class="moz-txt-link-rfc2396E" href="mailto:matthew@FreeBSD.org"><matthew@FreeBSD.org></a></td> </tr> </tbody> </table> <br> <br> I was going to mention "Curie point", but this seems to be a complex topic. (Forum discussion: <a class="moz-txt-link-freetext" href="https://www.overclockers.com/forums/threads/what-is-the-curie-point-of-hdd-magnetic-platters.454159/">https://www.overclockers.com/forums/threads/what-is-the-curie-point-of-hdd-magnetic-platters.454159/</a>; )<br> <br> I think you'd be just fine putting it in the oven on the cleaning cycle (about 550F).<br> <br> -C<br> <br> On 10/10/24 10:13, Matthew Seaman wrote:<br> <blockquote type="cite">On 10/10/2024 16:17, Ralf Mardorf wrote:<br> <blockquote type="cite">Someone might have the skills to extract data even after the plates have<br> been shredded and fused into a lump.<br> </blockquote> <br> The Néel temperature for steel is typically somewhere around 200 -- 500 ºC depending on the alloy. Steel that is hot enough to "fuse into a lump" will need to be significantly hotter than that -- nearly at the melting point. All of the magnetic information will have been wiped.<br> <br> Other ferromagnets useable for magnetic recording are going to behave similarly.<br> <br> Cheers,<br> <br> Matthew<br> <br> </blockquote> </div> </body> </html> --------------5VnU5omhsB4kEsvvGNm08QVO--
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