DVD+RW kernel patch - scsi error (help!)

[Frank Martelli <frank@foodsavvy.com>]

I am having a problem with burning DVD+RW's with my new DVD recorder. 
After patching the 2.4.18 kernel with Andy Polyakov's DVD+RW kernel patch,
I am getting the follow error when I attempt to 'mkudffs --spartable=2
--media-type=cdrw'

Sep  1 17:33:32 www kernel: scsi0: ERROR on channel 0, id 0, lun 0, CDB:
Request Sense 00 00 00 40 00
Sep  1 17:33:32 www kernel: Current sd0b:00: sense key Medium Error
Sep  1 17:33:32 www kernel: Additional sense indicates No seek complete
Sep  1 17:33:32 www kernel:  I/O error: dev 0b:00, sector 9180160
Sep  1 17:33:40 www kernel: scsi0: ERROR on channel 0, id 0, lun 0, CDB:
Request Sense 00 00 00 40 00
Sep  1 17:33:40 www kernel: Current sd0b:00: sense key Medium Error
Sep  1 17:33:40 www kernel: Additional sense indicates No seek complete
Sep  1 17:33:40 www kernel:  I/O error: dev 0b:00, sector 9180032
Sep  1 17:34:24 www kernel: sr0: injecting "SYNCHRONIZE CACHE"
Sep  1 17:34:32 www kernel: sr0: dirty DVD+RW media, "finalizing"

Running a 'mount -o rw,noatime /dev/scd0 /mnt/cdrom' and trying to copy
information to the volume invariably leads to failure.  I am running the
kernel 2.4.18, but have seen this error under 2.4.21 and 2.4.22, as well. 
Does anyone know what could be happening, here?  I can't make heads or
tails out of this message.

Strange thing:  I successfully made three backups without error when I
first installed this drive.

Thanks in advance!

-Frank