I was looking at the Best Buy ads when i was really bored, an i saw these external hard drives that went up to 1TB
Could you use this as a hard drive if you're making your own computer?
Also, would you have to install RAM, and a graphics card onto it?

What are you talking about?

Anyways--to answer your topic-title question, you should be able to set the BIOS to boot from an external drive. That means you can install an OS to an external and boot from it, not that I'd recommend it as it would be significantly slower than an internal drive in most cases.

Just buy a 1 tb internal hard drive if you're building a computer.

The RAM and graphics card go on the motherboard.

1TB External-Drives are expensive. I think you can nearly get two onboard ones for the price of one single TB.


~5ilence

If you're willing to pay the extra money and be willing to disassemble it so you can put it inside the PC... sure. It worked with my dad's backup drive that happened to have the USB port fail.

But for all usual purposes just buy an internal drive instead, it's a lot cheaper.