DVD error message

Anyone know what this error message means. I'm using Toast 11 and trying to duplicatea DVD
The drive reported an error:
Sense Key = HARDWARE ERROR
Sense Code = 0x09, 0x02
FOCUS SERVO FAILURE

Mac Pro
Model Identifier: MacPro4,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 1
Total Number Of Cores: 4
L2 Cache (per core): 256 KB
L3 Cache: 8 MB
Memory: 3 GB
Processor Interconnect Speed: 4.8 GT/s
Boot ROM Version: MP41.0081.B08
SMC Version (system): 1.39f5
SMC Version (processor tray): 1.39f5