|IMpatient is right in saying you should have provided more info.|
Probably the most frequent problem we who regularly answer here have is the person who started the Topic did not provide enough information. As far as I am, and many others who answer regularly are, concerned, the more details that are supplied, the more feedback from the person who started the Topic to any responses from others, the better.
You don't necessarily need to buy a drive from Dell.
There are lots of clone drives available on the web for a reasonable price, and some of them have specs that are better than your original drive.
Search the web using something such as: Inspiron 1300 replacement DVD drive
to find ones that are physically compatible with your model. Make sure your laptop model is listed in the ad.
DO NOT buy a used optical drive - it will NOT last as long as a new one.
The most frequent thing that causes an optical drive to become un-usable is the cheap sleeve bearings in the motor have deteriorated to the point that the motor can no longer spin the disk at even 1X speed (the legacy original audio CD speed), or the motor will not start to spin the disk at all (the most common symptoms of that - the led does light up when you insert a disk and then retract the tray when the computer is running, but it says on for a longer time, or blinks off and on for a longer time, when the drive is capable of reading the type of disk, or the disk does not change it's position at all when you compare that when it's first inserted to when it's ejected after that).
Dell probably has info about how to remove the drive. If it's not an easily removed module, usually you merely eject it's tray, remove one specfic screw on the bottom of the laptop, then gently wiggle the drive out of it's socket by wiggling the tray.
(If it won't eject when you press the button on it, there is a tiny hole on it's front that you can insert a stiff wire that's long enough straight inwards into to release the tray's "catch" and pop it out a bit.)
Search the web for: Inspiron 1300 manual.
One of the first "hits" will be Documentation for the model on the Dell site - the info is probably in the service manual.