Like yourself. 17GB per layer discs and triple-layer discs are not part of HD-DVD spec and as such are POSSIBLE FUTURE additions that have no annouced released date, no schedule for when they may be released, and are 99% likely to be incompatible with the optical heads in current and near future drives. If you have some proof proving otherwise, then by all means add the 51GB disc back in and REFFERENCE it.