You need to clear up some serious storage space for Modern Warfare 3 files, here's why
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Activision says its latest Call of Duty entry is bigger than previous Modern Warfare shooters due to the sheer amount of content in MW3.

Ah, yes. The “let’s bloat our game size to bully other games off your SSD so you’ll be reluctant to ever uninstall it, because reinstalling it would be a big pain, that way you’ll play it indefinitely and give us extra money in micro transactions” strategy.