occasional problem formatting/rewriting DVD+RW disk with Sony DRU530A burner.

I have 2 DVD burners on the same machine, the SONY DRU530A (primary) and the SONY 510A (slave). I have no problem burning DVD+R and DVD+RW using DRU510A. I have occasional problem formatting and rewriting data (use -Z option) on DVD+RW disks using the DRU530A. The problem only happens with the

occasional problem formatting/rewriting DVD+RW disk with Sony DRU530A burner.

I have 2 DVD burners on the same machine, the SONY DRU530A (primary) and the SONY 510A (slave). I have no problem burning DVD+R and DVD+RW using DRU510A. I have occasional problem formatting and rewriting data (use -Z option) on DVD+RW disks using the DRU530A. The problem only happens with the