I want to know the answer to the following question:
How many major hardware revisions has the 360 had?
All the background I'm provided with is that "Two major hardware revisions of the Xbox 360 have succeeded the original models; the Xbox 360 S (also referred to as the "Slim") replaced the original "Elite" and "Arcade" models in 2010.". Is that enough to answer the question?
Answer: yes