Is there a difference between an external or internal hard drive besides the
obvious? My computer is soooo slow.
An external USB drive will be slower than an internal one.
What does that difference have to do with your computer being slow?
Installing another drive, whether internal or external, is not going
to speed it up.
I am worried about opening the computer
to install an internal
Installing an internal drive is very simple. It requires mounting the
drive with four screws and plugging in two cables. If you've never
done it before, get a friend with more experience to work with you the
first time.
What do you plan on using this second drive for? It should be its use
that dictates whether it should be internal or external.