Samsung 840Pro in ASUS N53

[Strangeite]

I need more disk space (largely for gaming) but I know essentially nothing about computer upgrading and tech stuff. Can I replace my ASUS N53 laptop's internal hard drive with a Samsung 840Pro? Alternatively, what would be a good external hard drive that can connect with USB 3.0? (Price is a factor as well. Something under $100 would be preferable, but if the Samsung 840Pro (or something comparable) works and would be significantly better I'm willing to spend more)

 

[RealBeast]

You don't need a Pro, an 840 EVO will be more than adequate and much cheaper. External USB drives are highly unreliable, if you don't believe it look at the storage forum and the hundreds of users with issues.