Disappearing files on CD-Rs

[Bill Campbell]

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?

Bill
--
INTERNET:   bill at Celestial.COM  Bill Campbell; Celestial Software LLC
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URL: http://www.celestial.com/

The very powerful and the very stupid have one thing in common.
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to fit their views ... which can be very uncomfortable if you happen to
be one of the facts that needs altering.
                -- Doctor Who, "Face of Evil"
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scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.4
        <Adaptec 2940 Ultra SCSI adapter>
        aic7880: Ultra Single Channel A, SCSI Id=7, 16/253 SCBs

  Vendor: IBM       Model: DNES-318350       Rev: SA30
  Type:   Direct-Access                      ANSI SCSI revision: 03
(scsi0:A:0): 20.000MB/s transfers (20.000MHz, offset 15)
  Vendor: HP        Model: C7670A            Rev: 3945
  Type:   Processor                          ANSI SCSI revision: 02
  Vendor: NAKAMICH  Model: MJ-5.16S          Rev: 1.11
  Type:   CD-ROM                             ANSI SCSI revision: 02
(scsi0:A:5): 10.000MB/s transfers (10.000MHz, offset 15)
  Vendor: NAKAMICH  Model: MJ-5.16S          Rev: 1.11
  Type:   CD-ROM                             ANSI SCSI revision: 02
  Vendor: NAKAMICH  Model: MJ-5.16S          Rev: 1.11
  Type:   CD-ROM                             ANSI SCSI revision: 02
  Vendor: NAKAMICH  Model: MJ-5.16S          Rev: 1.11
  Type:   CD-ROM                             ANSI SCSI revision: 02
  Vendor: NAKAMICH  Model: MJ-5.16S          Rev: 1.11
  Type:   CD-ROM                             ANSI SCSI revision: 02
scsi0:A:0:0: Tagged Queuing enabled.  Depth 253
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
SCSI device sda: 35843670 512-byte hdwr sectors (18352 MB)
 sda: sda1 sda2 sda3 sda4 < sda5 sda6 >

Attached scsi CD-ROM sr0 at scsi0, channel 0, id 5, lun 0
Attached scsi CD-ROM sr1 at scsi0, channel 0, id 5, lun 1
Attached scsi CD-ROM sr2 at scsi0, channel 0, id 5, lun 2
Attached scsi CD-ROM sr3 at scsi0, channel 0, id 5, lun 3
Attached scsi CD-ROM sr4 at scsi0, channel 0, id 5, lun 4
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