Toast interface error -16434, Medium Error sense Code = 0x73, 0x03

I have a Machine Model: PowerBook G4 15"
CPU Type: PowerPC G4 (1.1)
Number Of CPUs: 1
CPU Speed: 1.25 GHz
L2 Cache (per CPU): 512 KB
Memory: 1 GB
Bus Speed: 167 MHz
Boot ROM Version: 4.7.1f1
Serial Number: V73 **GNRZ
MATSHITA DVD-R UJ-816:

Capacity: 332.09 MB
Manufacturer: MATSHITA
Model: MATSHITA DVD-R UJ-816
Revision: DXJ3
Serial Number:
Drive Type: CD-RW/DVD-RW
Disc Burning: Apple Supported/Shipped
Removable Media: Yes
Detachable Drive: No
BSD Name: disk1
Protocol: ATAPI
Unit Number: 0
Socket Type: Internal
The problem I have (Toast 6.0) is while I can burn CDs just fine, whenever I try to burn a DVD I get the following errors:
Sense Key = Medium Error sense Code = 0x73, 0x03
This happens when I try to burn a DVD with no special settings in the recorder settings =best speed
and
Toast interface error -16434
I have tried to lower the burn speed (x4 and 1xDVD) and checked buffer underun and when I run a simulation everything is fine but when I try to burn disc using the same settings I get Toast interface error -16434.
Any suggestions?
-RS

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