k3b stopped burning dvds

I have been backing up my dvd library with k9copy and then burning with k3b. Worked great 5 times then k3b stopped burning. It says the following:
System
-----------------------
K3b Version: 1.0.3

KDE Version: 3.5.8
QT Version: 3.3.7
Kernel: 2.6.22-14-generic
Devices
-----------------------
Memorex DVD+R/RW 2.4x8AA 1.27 (/dev/scd0, ) [CD-R, CD-RW, CD-ROM, DVD-ROM, DVD+R, DVD+RW] [DVD-ROM, DVD+RW, DVD+R, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R96R]

IDE-CD R/RW 4x4x24 C12a (/dev/scd1, ) [CD-R, CD-RW, CD-ROM] [Error] [TAO, RAW, RAW/R16]
Burned media
-----------------------
DVD+R

K3bIsoImager
-----------------------
mkisofs print size result: 2253384 (4614930432 bytes)
Pipe throughput: 33659904 bytes read, 33658880 bytes written.

Used versions
-----------------------
mkisofs: 1.1.6
growisofs: 7.0.1

growisofs
-----------------------
Executing 'builtin_dd if=/dev/fd/0 of=/dev/scd0 obs=32k seek=0'
/dev/scd0: "Current Write Speed" is 2.5x1352KBps.
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
          0/4614930432 ( 0.0%) @0x, remaining ??:?? RBU 100.0% UBU 0.0%
:-[ WRITE@LBA=0h failed with SK=0h/ASC=00h/ACQ=02h]: Input/output error
:-( write failed: Input/output error

growisofs command:
-----------------------
/usr/bin/growisofs -Z /dev/scd0=/dev/fd/0 -use-the-force-luke=notray -use-the-force-luke=tty -use-the-force-luke=tracksize:2253384 -use-the-force-luke=dao:2253384 -dvd-compat -speed=2.4 -use-the-force-luke=bufsize:32m

mkisofs
-----------------------
2253384
Warning: -follow-links does not always work correctly; be careful.
I: -input-charset not specified, using utf-8 (detected in locale settings)
  0.02% done, estimate finish Sun Feb 24 13:31:09 2008
  0.04% done, estimate finish Sun Feb 24 12:55:22 2008
  0.07% done, estimate finish Sun Feb 24 12:43:09 2008
  0.09% done, estimate finish Sun Feb 24 12:36:59 2008
  0.11% done, estimate finish Sun Feb 24 12:33:09 2008
  0.13% done, estimate finish Sun Feb 24 12:30:42 2008
  0.16% done, estimate finish Sun Feb 24 12:28:56 2008
  0.18% done, estimate finish Sun Feb 24 12:27:36 2008
  0.20% done, estimate finish Sun Feb 24 12:26:33 2008
  0.22% done, estimate finish Sun Feb 24 12:25:43 2008
  0.24% done, estimate finish Sun Feb 24 12:25:03 2008
  0.27% done, estimate finish Sun Feb 24 12:24:29 2008
  0.29% done, estimate finish Sun Feb 24 12:23:59 2008
  0.31% done, estimate finish Sun Feb 24 12:23:35 2008
  0.33% done, estimate finish Sun Feb 24 12:23:14 2008
  0.36% done, estimate finish Sun Feb 24 12:22:55 2008
  0.38% done, estimate finish Sun Feb 24 12:22:38 2008
  0.40% done, estimate finish Sun Feb 24 12:22:24 2008
  0.42% done, estimate finish Sun Feb 24 12:22:11 2008
  0.44% done, estimate finish Sun Feb 24 12:21:59 2008
  0.47% done, estimate finish Sun Feb 24 12:21:48 2008
  0.49% done, estimate finish Sun Feb 24 12:21:38 2008
  0.51% done, estimate finish Sun Feb 24 12:21:29 2008
  0.53% done, estimate finish Sun Feb 24 12:21:21 2008
  0.56% done, estimate finish Sun Feb 24 12:21:14 2008
  0.58% done, estimate finish Sun Feb 24 12:21:07 2008
  0.60% done, estimate finish Sun Feb 24 12:21:00 2008
  0.62% done, estimate finish Sun Feb 24 12:20:54 2008
  0.64% done, estimate finish Sun Feb 24 12:20:49 2008
  0.67% done, estimate finish Sun Feb 24 12:20:44 2008
  0.69% done, estimate finish Sun Feb 24 12:20:39 2008
  0.71% done, estimate finish Sun Feb 24 12:20:34 2008

mkisofs calculate size command:
-----------------------
/usr/bin/genisoimage -gui -graft-points -print-size -quiet -volid VIDEO_TS -volset -appid K3B THE CD KREATOR (C) 1998-2006 SEBASTIAN TRUEG AND THE K3B TEAM -publisher -preparer -sysid LINUX -volset-size 1 -volset-seqno 1 -sort /tmp/kde-dan/k3bdb3eBa.tmp -no-cache-inodes -udf -iso-level 1 -path-list /tmp/kde-dan/k3bksHEIb.tmp -dvd-video -f /tmp/kde-dan/k3bVideoDvd0

mkisofs command:
-----------------------
/usr/bin/genisoimage -gui -graft-points -volid VIDEO_TS -volset -appid K3B THE CD KREATOR (C) 1998-2006 SEBASTIAN TRUEG AND THE K3B TEAM -publisher -preparer -sysid LINUX -volset-size 1 -volset-seqno 1 -sort /tmp/kde-dan/k3bV5aIpc.tmp -no-cache-inodes -udf -iso-level 1 -path-list /tmp/kde-dan/k3bHa03qa.tmp -dvd-video -f /tmp/kde-dan/k3bVideoDvd0

Being new to Ubuntu this log means nothing to me. Please help. I don't know what I am doing differently. Any suggestions are greatly appreciated. Thanks.