Suikoden Tierkreis - Whats the ROM Size?

Hi community,Im just about to copy the game Suikoden Tierkreis into my flashcart, but i have some problem.Its 284Mb file size on my PC, but someone said its just 256MB ROM Size.
Anyway i dont have free place, i planned to delete an 512MB Rom Size game and add two 256Mb one.So.. Its 256MB ROM Size, or more than 2048?Asteroth

it should be 256MB thats what it was for mine