Date: Thu, 27 Sep 2001 11:38:57 -0600 From: "Kenneth D. Merry" <ken@kdm.org> To: Jussi Reissell <reissell@cc.helsinki.fi> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: Medium error on dd'ing from a CD Message-ID: <20010927113857.A30139@panzer.kdm.org> In-Reply-To: <87hetobkxb.fsf@mursu.pesa.fi>; from reissell@cc.helsinki.fi on Thu, Sep 27, 2001 at 08:30:56PM %2B0300 References: <87hetobkxb.fsf@mursu.pesa.fi>
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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
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