From owner-freebsd-questions@freebsd.org Sun May 3 19:56:20 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 8C2202E64FE for ; Sun, 3 May 2020 19:56:20 +0000 (UTC) (envelope-from kuku@kukulies.org) Received: from mail.kukulies.org (mail.kukulies.org [116.203.115.43]) by mx1.freebsd.org (Postfix) with ESMTP id 49FcDz0lFfz4748 for ; Sun, 3 May 2020 19:56:18 +0000 (UTC) (envelope-from kuku@kukulies.org) Received: from localhost (localhost [127.0.0.1]) by mail.kukulies.org (Postfix) with ESMTP id 0083010276A for ; Sun, 3 May 2020 21:56:17 +0200 (CEST) Received: from mail.kukulies.org ([127.0.0.1]) by localhost (mail.kukulies.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6K0jT99WZTzf for ; Sun, 3 May 2020 21:56:16 +0200 (CEST) Received: from christophs-mbp.fritz.box (p57A1FCC2.dip0.t-ipconnect.de [87.161.252.194]) by mail.kukulies.org (Postfix) with ESMTPSA id A217A102769 for ; Sun, 3 May 2020 21:56:16 +0200 (CEST) From: Christoph Kukulies Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Subject: dd: /dev/cd0: Invalid argument Message-Id: Date: Sun, 3 May 2020 21:56:16 +0200 To: freebsd-questions@freebsd.org X-Mailer: Apple Mail (2.3608.80.23.2.2) X-Rspamd-Queue-Id: 49FcDz0lFfz4748 X-Spamd-Bar: + Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of kuku@kukulies.org has no SPF policy when checking 116.203.115.43) smtp.mailfrom=kuku@kukulies.org X-Spamd-Result: default: False [1.96 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_HAM_MEDIUM(-0.62)[-0.622,0]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MV_CASE(0.50)[]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; AUTH_NA(1.00)[]; RCPT_COUNT_ONE(0.00)[1]; RCVD_COUNT_THREE(0.00)[4]; DMARC_NA(0.00)[kukulies.org]; NEURAL_SPAM_LONG(0.79)[0.788,0]; R_SPF_NA(0.00)[]; RCVD_NO_TLS_LAST(0.10)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; ASN(0.00)[asn:24940, ipnet:116.203.0.0/16, country:DE]; MID_RHS_MATCH_FROM(0.00)[]; IP_SCORE(0.29)[ipnet: 116.203.0.0/16(2.97), asn: 24940(-1.50), country: DE(-0.02)]; RECEIVED_SPAMHAUS_PBL(0.00)[194.252.161.87.khpj7ygk5idzvmvt5x4ziurxhy.zen.dq.spamhaus.net : 127.0.0.10] Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 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 19:56:20 -0000 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=3D/dev/cd0 of=3Dcd_dump=20 Doing this, I=E2=80=99m getting=20 $ dd if=3D/dev/cd0 of=3Dcd_dump dd: /dev/cd0: Invalid argument 0+0 records in 0+0 records out 0 bytes transferred in 0.000199 secs (0 bytes/sec) $=20 What=E2=80=99s wrong? /dev/da0 and /dev/cd0 are both character devices. = I can well cat /dev/cd0 >dump . =E2=80=94 Christoph