I just bought halo 3 odst and i got it tuesday and i just tried it today i bought it from eb games when i tired it for an hour it said disc could not read the disc is perfect and i though it was the 360 but gears and fear both work so i don't know i have a arcade 360 so no hardrive i only have a 64 mb memory card and it has no hdmi so yes it is and old model and i was going to take it back but they where not open and i did not pay extra 3 dollars for it so when it does not work you get another disc but now i really need help is it because odst needs allot of memory and i should get a hardrive because i am but i don't want to take the disc back for that it might take awhile for me to get a hard drive please help.