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SCSI CDrom: "Unable to identify CD-ROM Format" (works in DOS)

Posted on 1997-11-03
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Last Modified: 2013-12-15


      Please plese help me .. I am at the end of my wits ..  8-(

thanks much,
whay.


Symptom:

      Cdrom won't mount, optical drive flaky. Both work
      just fine in dos (can copy from slakware cdrom
      to optical drive and read it back)

      (with slakware 3.2 CD in the drive, also tested
      with RedHat CD ):
      # mount -t iso9660 /dev/scd0 /mnt/cdrom -o ro
-->>>      Unable to identify CD-ROM Format
      mount:      wrong fs type, bad option, bad superblock
      on /dev/scd0, or too many mounted file systems.

      _BUT_ workbone plays audio CDs just fine, and
      "dd if=/dev/scd0 of=/dev/scd0 bs=2048" works
      just fine too.

      (relevant?) kernel mesg in /var/adm/messages :
      sr_photocd: (SONY/PIONEER) Hmm, seems the CDROM
      doesn't support multisession CD's.
      (the slakware CD is not multisesion, right?)

Setup:

      Slackware 3.2 Kernel 2.0.29
            recompiled w/scsi driver: g_NCR5380
            + 53c400 extension.
      Cyrix 486DLC 40Mhz
      dtc3150v scsi controller, irq 5,
            memory mapped 0xd8000 (pseudo-dma)

      Sony SMO-C301 magneto optical drive (id5)
      Sony CDU-8012 cdrom drive (id6 , end of chain.)
      (No termination device visible on CDU-8012, I
      assume it's internally terminated, since this
      setup works fine in dos. Anyone has the spec ?)

/proc:

      filesystems:
                   ext2
                   minix
                   msdos
                   vfat
            odev   proc
            odev   nfs
            odev   smbfs
                   iso9660


      devices:
            Block devices:
             2 fd
             3 hd
             8 sd
            11 sr

      scsi/scsi:
            Attached devices:
            Host: scsi0 Channel: 00 Id: 05 Lun: 00
              Vendor: SONY     Model: SMO-C301-00      Rev: 1.43
              Type:   Direct-Access                    ANSI SCSI revision: 01
            Host: scsi0 Channel: 00 Id: 06 Lun: 00
              Vendor: SONY     Model: CD-ROM CDU-8012  Rev: 3.1a
              Type:   CD-ROM                           ANSI SCSI revision: 02


      scsi/g_NCR5380/0

            SCSI host number 0 : Generic NCR5380/NCR53C400 Scsi Driver
            Generic NCR5380 driver version 1
            NCR5380 core version 7
            NCR53C400 extension version 2
            NCR53C400 card detected
            NCR53C400 pseudo DMA used
            Using memory mapping at base 0xd8000, on interrupt 5
              T:5 Direct-Access     SONY     SMO-C301-00      1.43
                     1 kb read    in     0 secs
                     0 kb written in     0 secs
              T:6 CD-ROM            SONY     CD-ROM CDU-8012  3.1a
                   170 kb read    in     1 secs @ 174080 bps
                     0 kb written in     0 secs
            REQ not asserted, phase unknown.
            No currently connected command
            issue_queue
            disconnected_queue

Note:      I have another identical megneto optical drive
      in a p133, hooked up through a SB-16/SCSI (aha152x)
      with a Hitachi harddisk (scsi2) and a Chinon
      CDS525(SCSI2), and they work just fine too
      -> appears that mixing scsi-1 and scsi-2 on the
      same chain is not the source of the problem.

      The optical drive from the above flaky 486 system
      had been tested in the p133, and that was ok too.

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Question by:whay
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Accepted Solution

by:
Jasper111997 earned 100 total points
ID: 1630395
Hmm... try just:

mount /dev/scd0 /"mountpoint"

As mount's auto aetection is pretty good.

If that doesn't work, try checking if iso9660 is a module on your
machine, if it is, use "insmod iso9660" then repeat above.

And, at long last, as a despret messure, try useing the acctual
device. (i.e /dev/sda#, where # is the cdrom's numirical address
in your scsi chain.

If none of this helps, sorry but I don't have huge amounts of
experience in scsi hardware...
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