What is a External Hard Drive good for?

Im looking at buying a 3TB external hard drive. Ill link it in the bottom. I really need the space on my computer, so I can keep my stuff seperate from my dads. But will this be able to do everything I want? Im looking to be able to plug it into my USB and be able to download all my files and games onto there and... show more Im looking at buying a 3TB external hard drive. Ill link it in the bottom. I really need the space on my computer, so I can keep my stuff seperate from my dads. But will this be able to do everything I want? Im looking to be able to plug it into my USB and be able to download all my files and games onto there and run them on my PC with the files residing on there. Is that possible, or do I want something else?
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