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along with the 7.6GB install sacrafice along with the SP and MP progress saved on your hard drive it also saves every single game you have played to your hard drive if you want it to or not i have 49 game replay files on my hard drive at 3 or 4MB each i have one file 1012KB of memory it isn't a lot but the more you play the more it adds up so next time your on the dashboard (i have no idea how to do it on PS3) check your memory on your drive go to MW3 and look at all the files it creates. as i am writing this i am still trying to delete these all BE WARNED YOUR HARD DRIVE NEEDS TO BE CLEARED OF ALL THESE UNLESS YOU WANT THEM.