They're internal drives. It's best to go with a internal drive since you'll get better performance from it.
If you don't know how, then find out..
Ohh ohhh, look gateway even has a tutorial on how to do it:
http://service.gateway.com/gateway/step ... 02,00.html
Also if you were looking for something specific, then please state so.
"I found a CDRW/DVD thing is it good?" <---how should I know?
"I found a EXTERNAL USB CDRW/DVD drive, it's SONY CDRW-DVD232? Is this a good drive? Do you have any other reccomendations for a external drive since I do not know how to install a internal one?" <---very helpful and you'll get a better answer.
Get a internal one and learn how to install it. You'll get knowledge + save money.
~klinky