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http://www.berklix.com/~jhs/txt/dvds.html

DVD Media & drive Analysis To analyse failure modes
Not of general public browsing interest.
See Also: http://www.cdspeed2000.com/

For data recovery, it's best to do a mount, then tar, as that does retries.
whereas raw dd (& slice) give up early.

I can't find the CRC ECC checking in BSD /sys

  On host=laps, a mount of /dev/acd0 + tar failed (hanging) after 2 Gig.
  a mount of /dev/cd0 (using the scsi to atapi kernel hacks) read all
  4.5 Gig (though whether the data is valid is not yet known).

laps acd0 has given short files, & files with blocks of sero in.
laps cd0 has also delivered nulls
film on single speed has also delivered nulls twice while laps delivered OK.

-------------
DVD_Media:      Bulkpaq.co.uk DVD-R 8x Generation 4
  write_host:       jes
  read_uname:       5.3r
    {
    read_host:      dual
    read_drive:     NEC DV-5700A/1.91
    read_driver:    acd0
    result:     mount fails
    }{
    read_host:      film
    read_drive:     COMPAQ DVD-ROM DRD-8120B/1.09
    read_driver:    acd0
    result:     reads all 3.6G OK
    }{
    read_host:      laps
    read_drive:     UJDA730 DVD/CDRW/1.00
      {
      read_driver:  cd
      result:       bytes=3691053056 count=1802272 2273576 bytes/sec
            xs dd if=/dev/cd0 bs=2k of=bulkpaq.iso
      }{
      read_driver:  acd
      result:       bytes=3691053056
      }
    }

DVD_Media:      Datawrite
  write_host:       jes
  read_uname:       5.3r
    {
    read_host:      dual
    read_drive:     NEC DV-5700A/1.91
    read_driver:    acd0
    result:     mount fails
    }{
    read_host:      film
    read_drive:     COMPAQ DVD-ROM DRD-8120B/1.09
    read_driver:    acd0
    result:     bytes=3920265216 count=1914192
    }{
    read_host:      laps
    read_drive:     UJDA730 DVD/CDRW/1.00
      {
      read_driver:  cd
      result:       LATER
      }{
      read_driver:  acd
      result:       LATER
      }
    }

DVD_Media:      Intenso 4.2G DVD+R 1x-8x
  write_host:       eww@
  read_uname:       5.3r
    {
    read_host:      dual
    read_drive:     NEC DV-5700A/1.91
    read_driver:    acd0
    result:     readable.
    }{
    read_host:      film
    read_drive:     COMPAQ DVD-ROM DRD-8120B/1.09
    read_driver:    acd0
    result:     LATER
    }{
    read_host:      laps
    read_drive:     UJDA730 DVD/CDRW/1.00
      {
      read_driver:  cd
      result:       LATER
      }{
      read_driver:  acd
      result:       LATER
      }
    }

DVD_Media:      Philips DVD+RW 4.7G
  write_host:       gj@
  read_uname:       5.3r
    {
    read_host:      dual
    read_drive:     NEC DV-5700A/1.91
    read_driver:    acd0
    result:     mount fails
    }{
    read_host:      film
    read_drive:     COMPAQ DVD-ROM DRD-8120B/1.09
    read_driver:    acd0
    result:     LATER
    }{
    read_host:      laps
    read_drive:     UJDA730 DVD/CDRW/1.00
      {
      read_driver:  cd
      result:       LATER
      }{
      read_driver:  acd
      result:       LATER
      }
    }

DVD_Media:      Plain White
  write_host:       jes
  read_uname:       5.3r
    {
    read_host:      dual
    read_drive:     NEC DV-5700A/1.91
    read_driver:    acd0
    result:     dd fails
    }{
    read_host:      film
    read_drive:     COMPAQ DVD-ROM DRD-8120B/1.09
    read_driver:    acd0
    result:     LATER
    }{
    read_host:      laps
    read_drive:     UJDA730 DVD/CDRW/1.00
      {
      read_driver:  cd
      result:       LATER
      }{
      read_driver:  acd
      result:       LATER
      }
    }

DVD_Media:      *import
  write_host:       pas
  read_uname:       5.3r
    {
    read_host:      dual
    read_drive:     NEC DV-5700A/1.91
    read_driver:    acd0
    result:     mount fails
    }{
    read_host:      film
    read_drive:     COMPAQ DVD-ROM DRD-8120B/1.09
    read_driver:    acd0
    result:     dd fails after 1.1 Gig,  mount + tar reads 4.5 Gig
    }{
    read_host:      laps
    read_drive:     UJDA730 DVD/CDRW/1.00
      {
      read_driver:  cd
      result:       dd fails after 200M
      }{
      read_driver:  acd
      result:       dd fails after 500M
      }
    }

DVD_Media:      *shake
  write_host:       pas
  read_uname:       5.3r
    {
    read_host:      dual
    read_drive:     NEC DV-5700A/1.91
    read_driver:    acd0
    result:     mount fails
    }{
    read_host:      film
    read_drive:     COMPAQ DVD-ROM DRD-8120B/1.09
    read_driver:    acd0
    result:     FAILED:
                xs cdcontrol -f /dev/acd0  info
                dd if=/dev/acd0 bs=2k 
                162889728 bytes count=79536
            RUNNING:
                mount /cdrom
                cdcontrol -f /dev/acd0 speed 1
                tar 4.445 Gig read.
    }{
    read_host:      laps
    read_drive:     UJDA730 DVD/CDRW/1.00
      {
      read_driver:  cd
      result:       dd fails after 1.3 Gig, mount + tar reads 4.5 Gig
      }{
      read_driver:  acd
      result:       dd fails after 690 M, mount + tar fails, hangs after 2.1 G
    find . -type f -print | sort | xargs ls -l ; du
              20480 Oct 21 20:53 ./video_ts/video_ts.bup
              20480 Oct 21 20:53 ./video_ts/video_ts.ifo
             931840 Oct 21 20:53 ./video_ts/video_ts.vob
              88064 Oct 21 20:53 ./video_ts/vts_01_0.ifo
            3631104 Oct 21 19:44 ./video_ts/vts_01_0.vob
         1073739776 Oct 21 20:53 ./video_ts/vts_01_1.vob
         1073734656 Mar  2 16:22 ./video_ts/vts_01_2.vob
    find . -type f -exec cmpd -d -v {} ../cd0 \;
        ./video_ts/video_ts.ifo Deleted
        ./video_ts/video_ts.vob Deleted
        ./video_ts/video_ts.bup Deleted
        ./video_ts/vts_01_0.ifo Deleted
        ./video_ts/vts_01_0.vob Deleted
        ./video_ts/vts_01_1.vob Different:
             char 443 in line 302, (byte 196611)
        ./video_ts/vts_01_2.vob Different:
             char 1073734657 in line 1, (byte 1073734657)
    l video_ts
        1073739776 Oct 21 20:53 vts_01_1.vob*
        1073734656 Mar  2 16:22 vts_01_2.vob*

      }
    }

DVD_Media:      Budget www.01ne.co.uk 1-4X DVD-R *ital
  write_host:       jes
  read_uname:       5.3r
    {
    read_host:      dual
    read_drive:     NEC DV-5700A/1.91
    read_driver:    acd0
    result:     mount fails
    }{
    read_host:      film
    read_drive:     COMPAQ DVD-ROM DRD-8120B/1.09
    read_driver:    acd0
    result:     LATER
    }{
    read_host:      laps
    read_drive:     UJDA730 DVD/CDRW/1.00
      {
      read_driver:  cd
      result:       LATER
      }{
      read_driver:  acd
      result:       LATER
      }
    }

DVD_Media       Lehmanss BSD
  write_host        lehmans factory, label Doesnt say +/-
            paper labels claims over 8 Gig.  Du -s -k : 8209989
  read_uname:       5.3r
    {
    read_host:      dual
    read_drive:     NEC DV-5700A/1.91
    read_driver:    acd0
    result:     mount OK, du OK, dd reads 8494317568 bytes
    }{
    read_host:      film
    read_drive:     COMPAQ DVD-ROM DRD-8120B/1.09
    read_driver:    acd0
    result:     LATER
    }{
    read_host:      laps
    read_drive:     UJDA730 DVD/CDRW/1.00
      {
      read_driver:  cd
      result:       LATER
      }{
      read_driver:  acd
      result:       LATER
      }
    }

DVD_Media:      Linux Mag 2004 multi Knopiix
  write_host:       lehmans factory, label Doesnt say +/-
            Du -s -k : 3.8 G
  read_uname:       5.3r
    {
    read_host:      dual
    read_drive:     NEC DV-5700A/1.91
    read_driver:    acd0
    result:     mount OK, dd read 3935348736 bytes
    }{
    read_host:      film
    read_drive:     COMPAQ DVD-ROM DRD-8120B/1.09
    read_driver:    acd0
    result:     LATER
    }{
    read_host:      laps
    read_drive:     UJDA730 DVD/CDRW/1.00
      {
      read_driver:  cd
      result:       LATER
      }{
      read_driver:  acd
      result:       LATER
      }
    }

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