Did you use the newest Firmware?
Try media from Verbatim, Taiyo Yuden, Ritek and CMC, these types run good-acceptable on the most drives; maybe you better use max. 4x-speed
Benq DW 1640, LG GH-20N, Pioneer BDR-208
Crucial M4, Sandisk SSD, Plextor M5S, Sandisk Ultra Plus, OCZ Petrol 256GB