Packet writing on NEC1300

[John Williams <john@pond-weed.com>]

Hello,

I've got problems with Andy Polyakov's DVD+RW kernel patch. I'm using
kernel 2.4.21 and I've got a NEC 1300 drive. I'm using Ritek DVD+RW
media. The "growisofs" program is working 100% OK for me, but when I
apply the patch and try "mkudffs --spartable=2 --media-type=cdrw" I get
this:

Sep  4 18:57:52 buffy kernel: sr0: mmc-3 profile: 1Ah
Sep  4 18:58:11 buffy kernel: scsi0: ERROR on channel 0, id 1, lun 0, CDB: 0x03 00 00 00 40 00 
Sep  4 18:58:11 buffy kernel: Current sd0b:00: sns = 70  3
Sep  4 18:58:11 buffy kernel: ASC= c ASCQ= 0
Sep  4 18:58:11 buffy kernel: Raw sense data:0x70 0x00 0x03 0x00 0x00 0x00 0x00 0x0a 0x00 0x00 0x00 0x00 0x0c 0x00 0x00 0x00 0x00 0x00 
Sep  4 18:58:11 buffy kernel:  I/O error: dev 0b:00, sector 9180412
Sep  4 18:58:11 buffy kernel: sr0: dirty DVD+RW media, "finalizing"

And 'mkisofs -pad . | dd of=/dev/scdN obs=32k' gives me a *lot* of errors; 
some like the above and some like this:

Sep  3 18:54:09 buffy kernel:  I/O error: dev 0b:00, sector 3505596
Sep  3 18:54:09 buffy kernel:  I/O error: dev 0b:00, sector 3505848
Sep  3 18:54:09 buffy kernel:  I/O error: dev 0b:00, sector 3506100
Sep  3 18:54:09 buffy kernel:  I/O error: dev 0b:00, sector 3506352
Sep  3 18:54:09 buffy kernel:  I/O error: dev 0b:00, sector 3506604
Sep  3 18:54:09 buffy kernel:  I/O error: dev 0b:00, sector 3506856
Sep  3 18:54:09 buffy kernel:  I/O error: dev 0b:00, sector 3507108
Sep  3 18:54:09 buffy kernel:  I/O error: dev 0b:00, sector 3507360
Sep  3 18:54:09 buffy kernel:  I/O error: dev 0b:00, sector 3507612

Any ideas or suggestions welcome!

Thanks,
John