From nobody Fri Jan 14 19:18:50 2022 X-Original-To: questions@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 8FBEF1952C4F for ; Fri, 14 Jan 2022 19:18:57 +0000 (UTC) (envelope-from chris@monochrome.org) Received: from mail.monochrome.org (static-71-163-255-121.washdc.fios.verizon.net [71.163.255.121]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mail", Issuer "mail" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4JbB1D65Ngz3tmH for ; Fri, 14 Jan 2022 19:18:56 +0000 (UTC) (envelope-from chris@monochrome.org) Received: from tripel.monochrome.org (tripel.monochrome.org [192.168.1.11]) by mail.monochrome.org (8.15.2/8.15.2) with ESMTP id 20EJIouQ067801; Fri, 14 Jan 2022 14:18:50 -0500 (EST) (envelope-from chris@monochrome.org) Date: Fri, 14 Jan 2022 14:18:50 -0500 (EST) From: Chris Hill To: "Steve O'Hara-Smith" cc: questions@freebsd.org Subject: Re: zero filling a storage device (was: dd and mbr) In-Reply-To: <20220114185028.b825ed28e179a9e8d6f9141a@sohara.org> Message-ID: References: <77680665-7ddb-23c5-e866-05d112339b60@holgerdanske.com> <20220114023002.GP61872@eureka.lemis.com> <523b6b6d-b17c-e632-a36a-a8c26ad61798@qeng-ho.org> <20220114191303.171f1cad@archlinux> <20220114185028.b825ed28e179a9e8d6f9141a@sohara.org> User-Agent: Alpine 2.20 (BSF 67 2015-01-07) List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-Rspamd-Queue-Id: 4JbB1D65Ngz3tmH X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of chris@monochrome.org has no SPF policy when checking 71.163.255.121) smtp.mailfrom=chris@monochrome.org X-Spamd-Result: default: False [-0.10 / 15.00]; RCVD_TLS_LAST(0.00)[]; ARC_NA(0.00)[]; FREEFALL_USER(0.00)[chris]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[monochrome.org]; AUTH_NA(1.00)[]; NEURAL_SPAM_SHORT(1.00)[1.000]; TO_MATCH_ENVRCPT_SOME(0.00)[]; MID_RHS_MATCH_FROMTLD(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; MLMMJ_DEST(0.00)[questions]; R_SPF_NA(0.00)[no SPF record]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:701, ipnet:71.163.0.0/16, country:US]; RCVD_COUNT_TWO(0.00)[2] X-ThisMailContainsUnwantedMimeParts: N On Fri, 14 Jan 2022, Steve O'Hara-Smith wrote: > > I gather that military specs for deleting really secure data > involve thermite. Actually they use big expensive "shredders." I'm pretty sure. -- Chris Hill chris@monochrome.org