From owner-freebsd-scsi Thu Sep 27 10:39:15 2001 Delivered-To: freebsd-scsi@freebsd.org Received: from panzer.kdm.org (panzer.kdm.org [216.160.178.169]) by hub.freebsd.org (Postfix) with ESMTP id 80E2837B41A for ; Thu, 27 Sep 2001 10:39:12 -0700 (PDT) Received: (from ken@localhost) by panzer.kdm.org (8.11.6/8.9.1) id f8RHcvW30173; Thu, 27 Sep 2001 11:38:57 -0600 (MDT) (envelope-from ken) Date: Thu, 27 Sep 2001 11:38:57 -0600 From: "Kenneth D. Merry" To: Jussi Reissell Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: Medium error on dd'ing from a CD Message-ID: <20010927113857.A30139@panzer.kdm.org> References: <87hetobkxb.fsf@mursu.pesa.fi> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2i In-Reply-To: <87hetobkxb.fsf@mursu.pesa.fi>; from reissell@cc.helsinki.fi on Thu, Sep 27, 2001 at 08:30:56PM +0300 Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Thu, Sep 27, 2001 at 20:30:56 +0300, Jussi Reissell wrote: > Hi, > > I get the following errors when issuing a > $ dd if=/dev/rcd0c of=cd2 bs=64k > dd: /dev/rcd0c: Input/output error > 2081+0 records in > 2081+0 records out > 136380416 bytes transferred in 68.991715 secs (1976765 bytes/sec) > > And in the logs I find: > (cd0:sym0:0:0:0): READ(10). CDB: 28 0 0 4 c0 20 0 0 6 0 > (cd0:sym0:0:0:0): MEDIUM ERROR info:4c024 asc:6,0 > (cd0:sym0:0:0:0): No reference position found > (cd0:sym0:0:0:0): cddone: got error 0x5 back > > > The disk is a data disk. On a cursory inspection the image produced > with dd seems ok, despite the errors. I get the error on a couple of > disks I've burnt on some HP burner and my own Plextor. One commercial > (data) CD doesn't give any errors. Should I be concerned? > > I'm running on 4.3-stable, the CD-writer is a Plextor hanging off of a > Tekram 390u2w controller. Further details upon request. My guess is that you burned the disk in TAO (track at once) mode. If so, there will be a couple of runout sectors at the end of the disk. So the above may be normal. See the thread with the subject "Problems reading burned CDs" in the freebsd-scsi list archives for more details on this. Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message