I used the Sony DRU500 to write the DVD's. I was able to read them in a Sony DVPC 660 but not the DVPS 330. I checked the region on both writer and reader and they are the same. Vladimir Uschintsky stated ( DVD PLayer compatibility listings) he was able to read both formats. Valdimar did you run into any problems or do you have any suggestions? Any help would be greatly appreciated.