When backin' up a UHD in Fab, I've recently noticed a "BD66" clone option. Now, I've read that people have successfully made player-readable backups, on BDXL-100 discs, by burnin' only the first two layers. But then if one reads the Wikipedia UHD article, they mention that layer capacity was increased (from 25 to 33.3GB) by shortenin' the pits & lands. Would it, therefore, be theoretically possible to burn a BD-66 usin' a BD-50 disc? Just curious.