How many games can I download to my 1tb Hybrid Hard Drive?

So I want to know how manhy games its okay to download to my desktop,
I have a lenovo 1Tb Hybrid Hard Drive 8GB of Ram.
I only have Age of Empires 3, the Asian dynasty and the Warchiefs extesions that have on Disc.
Also downloaded on Steam Dota 2 and im planning to download Aion with steam is my computer going to be fine and not run slow, or how much space of my computer do games have to take so it can start effecting the performance?
Sorry im new to PC Gaming, but I really enjoy and would like some common knowledge about computers so if anyone has any ideas please enlighten me. Thanks

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