no im not.
they are ROM(read only memory) carts, which hold extra information for the game(as opposed to being RAM (random access memory) carts, which can store anything sent to them, the rom carts cant be rewritten, and already have the information required for the game on them)
they were used because its faster to access data from a rom chip than a cdrom disc
a RAM cart is used by a few japanese games, mainly fighters, and that just stores extra information loaded from the cd into it during the game