From owner-freebsd-questions@freebsd.org Sun May 3 22:04:03 2020 Return-Path: Delivered-To: freebsd-questions@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 5229F2BB4BC for ; Sun, 3 May 2020 22:04:03 +0000 (UTC) (envelope-from arne@Steinkamm.COM) Received: from mail.steinkamm.com (mail.steinkamm.com [194.127.175.194]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "steinkamm.com", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 49Fg4H5X6Rz4NFY for ; Sun, 3 May 2020 22:03:59 +0000 (UTC) (envelope-from arne@Steinkamm.COM) Received: from trajan.stk.cx (trajan.stk.cx [10.8.8.110]) by basis.steinkamm.com (8.15.2/8.15.2) with ESMTPS id 043M3nLN025711 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Mon, 4 May 2020 00:03:49 +0200 (CEST) (envelope-from arne@steinkamm.com) Received: from trajan.stk.cx (localhost [127.0.0.1]) by trajan.stk.cx (8.15.2/8.15.2) with ESMTPS id 043M3mVs033616 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Mon, 4 May 2020 00:03:48 +0200 (CEST) (envelope-from arne@trajan.stk.cx) Received: (from arne@localhost) by trajan.stk.cx (8.15.2/8.15.2/Submit) id 043M3aHs033189; Mon, 4 May 2020 00:03:36 +0200 (CEST) (envelope-from arne) Date: Mon, 4 May 2020 00:03:36 +0200 From: Arne Steinkamm To: Christoph Kukulies Cc: freebsd-questions@freebsd.org, arne@steinkamm.com Subject: Re: dd: /dev/cd0: Invalid argument Message-ID: <20200503220336.GG82984@trajan.stk.cx> Reply-To: arne@Steinkamm.COM References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt@Trajan/1.12.1 X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on basis.steinkamm.com X-Rspamd-Queue-Id: 49Fg4H5X6Rz4NFY X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of arne@Steinkamm.COM has no SPF policy when checking 194.127.175.194) smtp.mailfrom=arne@Steinkamm.COM X-Spamd-Result: default: False [-0.02 / 15.00]; ARC_NA(0.00)[]; HAS_REPLYTO(0.00)[arne@Steinkamm.COM]; NEURAL_HAM_MEDIUM(-0.86)[-0.864,0]; RCPT_COUNT_THREE(0.00)[3]; TO_DN_SOME(0.00)[]; FROM_HAS_DN(0.00)[]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[Steinkamm.COM]; REPLYTO_DOM_EQ_FROM_DOM(0.00)[]; AUTH_NA(1.00)[]; NEURAL_HAM_LONG(-0.35)[-0.351,0]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; IP_SCORE(-0.00)[country: DE(-0.02)]; R_SPF_NA(0.00)[]; FORGED_SENDER(0.30)[freebsd-questions@Steinkamm.COM,arne@Steinkamm.COM]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:34646, ipnet:194.127.175.0/24, country:DE]; FROM_NEQ_ENVFROM(0.00)[freebsd-questions@Steinkamm.COM,arne@Steinkamm.COM]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 May 2020 22:04:03 -0000 Hi, On Sun, May 03, 2020 at 09:56:16PM +0200, Christoph Kukulies wrote: > I got a bit further with seeing my old SCSI-Periphals on the external SCSI bus connected to the sym0 (ASUS SC-200 Interface). > > I can dd one of the disks connected there (/dev/da0) completely (2GB) > > But I cannot dd if=/dev/cd0 of=cd_dump > > Doing this, I???m getting > > $ dd if=/dev/cd0 of=cd_dump > dd: /dev/cd0: Invalid argument > 0+0 records in > 0+0 records out > 0 bytes transferred in 0.000199 secs (0 bytes/sec) > $ > > What???s wrong? /dev/da0 and /dev/cd0 are both character devices. I can well cat /dev/cd0 >dump . The blocksize of CDs is 2k so use 2k or a multiplier of it. dd if=/dev/cd0 ibs=2k of=cd_dump .//. Arne -- Arne Steinkamm | Home: Mail: arnesteinkammcom