It would likely help if I was typing in English that everyone could understand. My thought was that you are trying to use -RW discs that have been previously used. Sometimes there appear to be issues when trying to use RW discs that were burned in another piece of hardware, such as a standalone DVD recorder.
However, after rereading your initial post, it appears that you are simply having trouble burning. I would suggest trying to burn data to various discs (DVD+/-R and a DVD-RW) and see which ones work…if any. Also, is the drive able to read DVD’s (commercial and burned).
As for DMA, I’ve seen it make reading/burning extremely slow, but not stop working at all.
edit: you may also want to use a different app for the burn test. IMGBurn is a good app and free.