As I am seriously considering installing an SSD in my iMac soon, I'm thinking it would be a good time to upgrade the HDD inside of it too. It currently has a 500GB one but I want to increase this to 1TB. My question is, what size HDD is inside of it? I'm assuming it's a 3.5" regular type? Also, as I find my current HDD quite noisy, can anyone recommend a reliable and quiet HDD? Any help would be greatly appreciated .