Differrent between Full face and Hub printable dvds

I am not sure what is the different between full face printable dvds and hub printable dvds. Somebody Please let me know…

full face I think are the ones that will print across the whole media right to the hole for the spindle like many pressed media are done these days. The other stops at the outer part of the hub where the actual burning surface stops like all blank media does.
Haven’t found any decent full face media around here yet but I’m sure somebody sells it with quality blank media under it.