I did the firmware with 1.Z7 tests and recorded all dvd-dl perfectly. No truncated recording. I tested with the media - MKM-003-00, RICOHJPN-D01-67, MKM-001-00, RITEK-S04-66, UMEDISC-DL1-64, YUDEN000-T03-00, TYG03, MCC-004-00, MCC 03RG20, YUDEN000-T03-00, T02-00-YUDEN000 and all recordings gave no error. This dvd sony AD-5280S is the best of all I have ever used.