should gears of War 2 be on two disks?

[SecondWar]

http://gearsofwar.wikia.com/wiki/Locust-Human_War

If your interested in the story and dont buy the books/comics etc check that page out (its a sort of wikipedia for Gears). Fills in the gaps and has the extra info Epic Games has released since Gears 2 which builds it up for Gears 3