Burning DVD-R with AmiDVD

Hello,

I tried to do some backup with AmiDVD but I toasted at least 3 DVD-R now.
After making an image file and starting the actual burn AmiDVDs output window tells something like this:

sense: 71 00 02 00 00 00 00 0a 00 00 00 00 04 01 00 00 00 00
SCSI command 00 00 00 00 00 00 failed
sense: 71 00 02 00 00 00 00 0a 00 00 00 00 04 01 00 00 00 00
SCSI command 00 00 00 00 00 00 failed
sense: 71 00 02 00 00 00 00 0a 00 00 00 00 04 01 00 00 00 00
SCSI command 2a 00 00 00 00 40 00 00 20 00 failed
sense: 71 00 02 00 00 00 00 0a 00 00 00 00 04 08 00 80 ff ff
SCSI command 51 00 00 00 00 00 00 00 22 00 failed
sense: 71 00 02 00 00 00 00 0a 00 00 00 00 04 08 00 80 ff ff
SCSI command 51 00 00 00 00 00 00 00 22 00 failed
sense: 71 00 02 00 00 00 00 0a 00 00 00 00 04 08 00 80 ff ff
SCSI command 51 00 00 00 00 00 00 00 22 00 failed
sense: 71 00 02 00 00 00 00 0a 00 00 00 00 04 08 00 80 ff ff
SCSI command 51 00 00 00 00 00 00 00 22 00 failed
sense: 71 00 02 00 00 00 00 0a 00 00 00 00 04 08 00 80 ff ff
SCSI command 52 01 00 00 00 01 00 00 24 00 failed
sense: 71 00 03 00 00 00 00 0a 00 00 00 00 0c 00 00 00 00 00
SCSI command 52 01 00 00 00 01 00 00 24 00 failed
sense: 71 00 03 00 00 00 00 0a 00 00 00 00 0c 00 00 00 00 00

...and the burning stops after approx. 2% with "Error". I use rather expensive media (no no-name stuff) and the DVD writer is a TSST Corp. CDDVDW - a similar model in my Dell notebook works flawless. AmiDVD burns CD-R by the way without any problem.

What can I do/test/...?

EDIT: BTW the burning with "Test" enabled worked - no "Error" here and it ran to 100%.

@cha05e90

Ok, here is the reply to myself: Despite the fact that both AmiDVD and FryingPan report my DVD writer to be able to write DVD-R media and both did the run with "test mode" enabled - it won't do it. Went out, buyed DVD+R media - worked! So I define this writer as a DVD+R writer. Sigh.