Both formats are capacitance based systems. CEDs have grooves, VHDs do not. I know the pickup designs are quite different, but could a CED player be modified to play VHD discs, using a pickup design that woulld read both types of discs? VHDs last longer, and from what I've seen look better than CEDs, but there are alot more releases for CED (at least in NTSC).
I'm sure that there are many VHD exclusive titles, and vice versa. I'm thinking that it would have to be a CED player modified to play VHDs, as opposed to the other way round, because CED caddies are larger than VHD caddies. If someone would make such a thing as a home project, add me to the list of buyers.
STAY AWESOME!