I just tried copying blu-ray direct disk to disk, Planet Earth Blu-ray, disk 1 (25GB). Put the original in the blu-ray reader, enable AnyDVD HD, put a blank BD-RE in the blu-ray burner. Fire up ImgBurn, set to Build Mode and drag BDMV folder from the original into ImgBurn. Burn directly to BD-RE at 2x. Process done without any problem! and without ripping to hard disk first. It’s a 25GB movie though, but a 50GB movie should also work.