https://wccftech.com/call-of-duty-modern-warfare-launch-file-size/

Recently, Activision revealed the PC system requirements for Call of Duty: Modern Warfare, and many were shocked by how much storage space they would need – a whopping 175GB. Thankfully, Activision would later clarify that the 175GB figure included all the game’s planned DLC, and that the game wouldn’t be quite so hefty at launch.

In each of the Specs, the HDD references HD space of 175GB. 175GB is the storage space we recommend players keep available in order to download the post-launch content we’ll be bringing to Modern Warfare. At launch, the initial download will be smaller.