because it is a DVD burner, not a CD burner
No. The laser in a CD burner is too wide to write to a DVD properly.
An external drive will be a little slower because of the speed differences between SATA (internal) and USB (external). The obvious advantage to an external is changeability, ease of access, etc.
No you need a burner.
If you have a CD burner, yes
You can convert a CD to MP3 using a disk burner. A disk burner will burn the information on a CD and convert it to MP3 format where you can listen to the music.
I do, thanks for asking. No, you can't borrow it. If you're trying to determine if YOU have a CD burner, usually looking at the front of it will tell you.
No but brad will tell you what it is
Most likely, your computer is not a CD-RW burner, so it can play it, but not edit things on it. My suggestion, put it into a CD-RW burner or DVD Player with burner, then try again.
No, by default GX520 comes with a built-in device which is CD player and burner + DVD player.
Not necessarily. You can have a CD/DVD reading drive that does not write.
CD-Rs and CD+Rs are not, but CD-RWs and CD+RWs are. You will need to check your burner to see if you need + or -.