Install the CD drive

Typically the CD drive goes in the very top bay of the computer case. But before you do that, make sure the IDE/HDD cable is long enough to connect both devices (HDD Drive and CD Drive) that will be on that cable. If the CD drive is going to be the only device, then this won't be a problem.

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Installing the CD drive:

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Since with most cases it would be nearly impossible to slide the CD drive in from the inside, we'll focus on installing it through the front of the case.

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Make sure you've removed any plastic panels or metal tabs that might be covering up the extra bays inside the case. If you haven't already done this, then refer to (Preparing the chassis).

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One more thing you should do before putting the drive in is to check the jumper settings to make sure they coincide with the setup you've determined.

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When you're ready to physically install the drive, just slide it into the bay you've selected for it. Everything should go smoothly; if it doesn't then you should check for any obstructions that may be blocking it.

Once the front of the drive is flush with the case you're ready to secure it with screws. Sometimes the CD drives come with a bag of four small screws. Don't worry if it didn't since you can go ahead and use the small thread screws that came with your case. If the cover of your case doesn't come off in one piece, but rather has two panels that slide off (as is typical), then go ahead and take the panel off the other side if you already haven't. This is necessary to access the screw holes on the other side of the drive. It's a good idea to use all four screw holes available, unlike the hard drive installation, because you will be pushing the button on CD drive quite often, and the more secure it is the less chance there is of it coming loose. Sometimes a CD drive will have eight screw holes available. Four screws are plenty and using eight screws would just be overkill.