and 256 mb will be used for the software and the other 250 for what i put on it (like music)?

and the other questions? i will paste all.

with uktube, in the middle of the reproduction it stop and get bloked, i need to have instaled the ukmpdark?, is this the best way to see youtube?

fat 16 or fat 32?
install apps will slowdown the 770?

thanks