External Hard drive vs Internal Hard drive

So my PC only has one hard drive and that's for windows, since dual booting seems to be risky cause Microsoft hates everyone it's recommended to buy another hard drive. However, I'm stupid lazy and I already have a 4 tb hard drive that I'm not using for anything. Theoretically it should work just like a normal hard drive because USB 3.0 speeds are much faster than hard drive read/write speeds anyway.

Right?

submitted by /u/imakesubsreal
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