DVD writer stopped working

From: ? (?_at_?.net)
Date: 10/26/04 

Date: Tue, 26 Oct 2004 17:05:06 GMT

        I am running Slackware 10. My DVD writer, a LiteOn SOHW-812S has been
working flawlessly, until recently. All of a sudden, growisofs started
having difficulties burning DVDs, and now it seems to be unable to. If, as
root, I issue the following command:

        growisofs -Z /dev/scd0=image.iso

the green light in the DVD writer blinks for a few seconds, then it stops,
then it blinks again, more rapidly, for a few seconds, then stops. The
command above eventually returns, printing the following:

        :-( /dev/scd0: media is not recognized as recordable DVD: 0

Now, I know that the DVD in the DVD writer is fine - I have used such DVDs
in the past, in this writer, without any problems. Also, I have tried
several DVDs from different makers, and the end result is the same one
described above. Incidentally, this happens both with DVD-R and DVD-RW
DVDs - both of them supported by my DVD writer, as I successfully burnt
such types af DVDs just a few weeks ago.

        For more info, the output from cdrecord -scanbus is

        Cdrecord 2.00.3 (i686-pc-linux-gnu) Copyright (C) 1995-2002 Jörg
        Schilling
        Linux sg driver version: 3.1.25
        Using libscg version 'schily-0.7'
        scsibus0:
                0,0,0 0) 'LITE-ON ' 'DVDRW SOHW-812S ' 'US0J' Removable
                CD-ROM
                0,1,0 1) *
                0,2,0 2) *
                0,3,0 3) *
                0,4,0 4) *
                0,5,0 5) *
                0,6,0 6) *
                0,7,0 7) *

which is exactly as it always has been, when the writer worked fine. The
modules I have loaded are

        Module Size Used by Tainted: PF
        isofs 26900 1 (autoclean)
        zlib_inflate 18308 0 (autoclean) [isofs]
        loop 9432 3 (autoclean)
        sg 27420 0 (autoclean)
        sr_mod 14008 0 (autoclean)
        nlvcard 1736 0 (unused)
        mishim 315232 1
        nfs 50392 5 (autoclean)
        lockd 39376 1 (autoclean) [nfs]
        sunrpc 67712 1 (autoclean) [nfs lockd]
        audio 42616 0
        pwc 47472 0
        videodev 6336 1 [pwc]
        usb-ohci 19048 0 (unused)
        usbcore 62252 1 [audio pwc usb-ohci]
        forcedeth 9708 1
        ohci1394 25552 0 (unused)
        ieee1394 185028 0 [ohci1394]
        nvidia 4583724 6
        ide-scsi 10128 0
        ide-cd 32000 0
        cdrom 28000 0 [sr_mod ide-cd]
        scsi_mod 56184 3 [sg sr_mod ide-scsi]
        emu10k1 60620 0
        sound 57192 0 [emu10k1]
        ac97_codec 13300 0 [emu10k1]
        soundcore 3652 9 [audio emu10k1 sound]
        unix 15344 18 (autoclean)

which, again, is pretty much what have always had, when the writer was
working.

        For completeness, I downloaded a copy of cdrecord-prodvd, and the command

        cdrecord-prodvd -v -speed=40 dev=0,0,0 -data image.iso

returns

        ./cdrecord-prodvd: No write mode specified.
        ./cdrecord-prodvd: Asuming -tao mode.
        ./cdrecord-prodvd: Future versions of cdrecord may have different drive
        dependent defaults. ./cdrecord-prodvd: Continuing in 5 seconds...
        Cdrecord-ProDVD-Clone 2.01b31 (i686-pc-linux-gnu) Copyright (C) 1995-2004
        Jörg Schilling Unlocked features:
        Limited features:
        TOC Type: 1 = CD-ROM
        scsidev: '0,0,0'
        scsibus: 0 target: 0 lun: 0
        Linux sg driver version: 3.1.25
        Using libscg version 'schily-0.8'.
        SCSI buffer size: 64512
        atapi: 1
        Device type : Removable CD-ROM
        Version : 0
        Response Format: 2
        Capabilities :
        Vendor_info : 'LITE-ON '
        Identifikation : 'DVDRW SOHW-812S '
        Revision : 'US0J'
        Device seems to be: Generic mmc2 DVD-R/DVD-RW. Current: none Profile:
        DVD+R
        Profile: DVD+RW
        Profile: DVD-RW sequential overwrite
        Profile: DVD-RW restricted overwrite
        Profile: DVD-R sequential recording
        Profile: DVD-ROM
        Profile: CD-RW
        Profile: CD-R
        Profile: CD-ROM
        ./cdrecord-prodvd: This version of cdrecord limits DVD-R/DVD-RW support
        to
        -dummy or 1 GB real. ./cdrecord-prodvd: If you need full DVD-R/DVD-RW
        support, ask the Author for cdrecord-ProDVD. ./cdrecord-prodvd: Free test
        versions and free keys for personal use are at
        ftp://ftp.berlios.de/pub/cdrecord/ProDVD/ Using generic SCSI-3/mmc
        CD-R/CD-RW driver (mmc_cdr). Driver flags : MMC-3 SWABAUDIO BURNFREE
        FORCESPEED Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16
        RAW/R96P RAW/R96R FIFO size : 4194304 = 4096 KB Track 01: data 384
        MB
        Total size: 441 MB (43:44.66) = 196850 sectors Lout start: 441
        MB (43:46/50) = 196850 sectors ./cdrecord-prodvd: Input/output error.
        test unit ready: scsi sendcmd: no error CDB: 00 00 00 00 00 00 status:
        0x2 (CHECK CONDITION)
        Sense Bytes: 70 00 02 00 00 00 00 0A 00 00 00 00 3A 00 00 00 Sense Key:
        0x2 Not Ready, Segment 0
        Sense Code: 0x3A Qual 0x00 (medium not present) Fru 0x0 Sense flags: Blk
        0 (not valid)
        cmd finished after 0.000s timeout 40s ./cdrecord-prodvd: No disk / Wrong
        disk!

This all makes me think that there some sort of hardware problem, but
where? The DVD writer is recognized all right, but it acts as though there
was no DVD - and there is one, believe me.

        Anyone can suggest ways to troubleshoot this? At this point, I am stymied.

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