Disappearing files on CD-Rs

[Net Llama!]

Bill Campbell wrote:
> I've come across a strange situation in which files seem to go missing from
> CD-R drives.  The files are really there, but can't be found after some
> period of time on various Linux systems ranging from Caldera OpenLinux 1.3
> with a SAF SCSI CD-R drive to a Caldera 3.1.1 Workstation with a SCSI
> Nakamichi 5 disk CD changer.
> 
> The ISO images were made on a Caldera OpenLinux 2.3 system running
> mkisofs-1.12b5-3, and burned on an Apple G4 running OS X 10.1.3 (it's much
> faster than the 2x SAF drive).
> 
> It appears that the problem may be media related.  I've attached what I
> think are the relevant portions of dmesg output from a COL 3.1.1
> Workstation system when I ran a script that tested for the presence of each
> file that is on the CD.  I ran the same script on the G4, and it found all
> the files without errors.
> 
> The media in this case is no-name from CompUSA, written at the default
> maximum speed on the G4.  I'm burning a new one, this time on a TDK ``32X
> compatible'' CD-R to see how that works.
> 
> Any suggestions on what might be causing this other than cheapo media?
> 
> sr0: scsi3-mmc drive: 16x/16x xa/form2 cdda changer
> sr0: CDROM (ioctl) reports ILLEGAL REQUEST.
> Uniform CD-ROM driver Revision: 3.12
> sr1: scsi3-mmc drive: 16x/16x xa/form2 cdda changer
> sr1: CDROM (ioctl) reports ILLEGAL REQUEST.
> sr2: scsi3-mmc drive: 16x/16x xa/form2 cdda changer
> sr2: CDROM (ioctl) reports ILLEGAL REQUEST.
> sr3: scsi3-mmc drive: 16x/16x xa/form2 cdda changer
> sr3: CDROM (ioctl) reports ILLEGAL REQUEST.
> sr4: scsi3-mmc drive: 16x/16x xa/form2 cdda changer
> sr4: CDROM (ioctl) reports ILLEGAL REQUEST.
> ISO 9660 Extensions: RRIP_1991A
> scsi0: ERROR on channel 0, id 5, lun 0, CDB: Read (10) 00 00 00 16 34 00 00 3f 00 
> Info fld=0x1634 (nonstd), Current sd0b:00: sense key Medium Error
> Additional sense indicates No seek complete
>  I/O error: dev 0b:00, sector 22736
> Uniform CD-ROM driver unloaded

Its the CD.  You're getting a medium error, and the CD is the medium. 
Are you sure that you're not burning the CDs at a speed that is faster 
than what they're rated for?  Usually when you run cdrecord, it will 
beable to determine the speed rating of the CD in its output, and this 
sometimes differs from even what's on the label.



-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
L. Friedman                       	       netllama at linux-sxs.org
Linux Step-by-step & TyGeMo: 		    http://netllama.ipfox.com

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