From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from v1.tansi.org (mail.tansi.org [84.19.178.47]) by mail.server123.net (Postfix) with ESMTP for ; Sat, 20 Apr 2019 10:00:05 +0200 (CEST) Received: from gatewagner.dyndns.org (81-6-44-245.init7.net [81.6.44.245]) by v1.tansi.org (Postfix) with ESMTPA id 772EE140171 for ; Sat, 20 Apr 2019 10:00:01 +0200 (CEST) Date: Sat, 20 Apr 2019 10:00:04 +0200 From: Arno Wagner Message-ID: <20190420080004.GA4461@tansi.org> References: <7ce39bb6-6a83-4a70-98eb-2cc0148de230@email.android.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: <7ce39bb6-6a83-4a70-98eb-2cc0148de230@email.android.com> Subject: Re: [dm-crypt] Problem_wiping List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: dm-crypt@saout.de Hi, what kind of problem do you think there is? I do not see any. You just seem to have a slow dsk... Regards, Arno On Fri, Apr 19, 2019 at 15:13:27 CEST, Dernsen wrote: > Hi, > I prepared a partition on my hdd (no ssd) as described in cryptsetup > FAQ (intel i3 3rd gen. ; 4gb ram): > Test 1. dd urandom direct on partition: > root@pocket-pc:/home/dernsen# dd bs=3D16M status=3Dprogress if=3D/dev/= urandom > of=3D/dev/sda3 > 55566139392 Bytes (56 GB, 52 GiB) kopiert, 1611 s, 34,5 MB/s > dd: Fehler beim Schreiben von '/dev/sda3': Auf dem Ger=E4t ist kein > Speicherplatz mehr verf=FCgbar > 3313+0 Datens=E4tze ein > 3312+0 Datens=E4tze aus > 55574528000 Bytes (56 GB, 52 GiB) kopiert, 1630,73 s, 34,1 MB/s > root@pocket-pc:/home/dernsen# > Test 2. dm-crypt + dd on device-mapper: > root@pocket-pc:/home/dernsen# cryptsetup open --type plain -d > /dev/urandom /dev/sda3 to_be_wiped > root@pocket-pc:/home/dernsen# dd bs=3D16M status=3Dprogress if=3D/dev/= zero > of=3D/dev/mapper/to_be_wiped > 55566139392 Bytes (56 GB, 52 GiB) kopiert, 1536 s, 36,2 MB/s > dd: Fehler beim Schreiben von '/dev/mapper/to_be_wiped': Auf dem Ger= =E4t > ist kein Speicherplatz mehr verf=FCgbar > 3313+0 Datens=E4tze ein > 3312+0 Datens=E4tze aus > 55574528000 Bytes (56 GB, 52 GiB) kopiert, 1554,81 s, 35,7 MB/s > root@pocket-pc:/home/dernsen# > There is almost no difference in speed. > 1. Did i do any mistake? > 2. Is this recommodation still up to date? > Best > Sebastian > _______________________________________________ > dm-crypt mailing list > dm-crypt@saout.de > https://www.saout.de/mailman/listinfo/dm-crypt --=20 Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@wagner.name GnuPG: ID: CB5D9718 FP: 12D6 C03B 1B30 33BB 13CF B774 E35C 5FA1 CB5D 9718 ---- A good decision is based on knowledge and not on numbers. -- Plato If it's in the news, don't worry about it. The very definition of=20 "news" is "something that hardly ever happens." -- Bruce Schneier