My hard drive is 500GB but only has 155GB. I'm looking to upgrade this though since I probably need around 1TB for my Steam games alone. I've got over 190 games between Steam and the few that I bought discs for, a lot of which have DLC that require more space to install. I want more than 1TB though since I like to have the space there to stop my computer from slowing down and who knows when I might need more.