How much memory is possible?

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No, I'm not talking about the one in your brain that helps you retain things, although that one is pretty significant too. I'm actually talking about the one in your computer. Whether you are technologically saavy or not, most people are aware of how much computer memory is necessarry to store their most priced documents. Do you keep lots of pictures, word documents, music, games, or other programs on your computer? Does it eat up your memory?Have you purchased an internal or external hard drive due to your higher demand of computer storage? I'm considering getting a 300 or a 500 gb hard drive due to my increasing amount of memory, and lack of memory on my computer. Anyone else had this issue?