My PS3 has a 160GB hard drive. I've had it for about a year, and played a lot of games. When I checked it's storage, it says 77GB free out of 149GB. I was aware that I had downloaded and installed a lot of games, and had lots of saves, so I went and cleared all the saves of the games I don't really play, and deleted my previous Skyrim saves, leaving the future save. I know Skyrim saves take up to 4000 megabytes, so once I cleared all of this crap out of my system, I thought I would check the storage. 94GB remaining.
My question is: what could be taking up the rest of the memory? I had some saves left on my system like MW3, Black Ops, Skyrim, Mafia 2, AC3. I deleted all my other AC:R, AC:BH, AC1 saves, but I thought they wouldn't take up another 40GB! What's using up all this space?