What should I put in the optical drive slot thing on my computer?

What should I put in the optical drive slot thing on my computer? pc case with optical drive slot PC case that's easy to build in As you'll see in the video above, this unique inverted micro-ATX case sports a external drive bay pcie slot configuration gen1 gen2 gen3 Optical drive support as well as general external appearance of the case Open the case and identify whether the PSU slot is bottom- or rear-mounted

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pcie x1 slot I am looking for some opinions, on what is the best PC gaming case on the market right now, that also includes an optical drive slot  I just looked at a case that will hold 18 fans! But, no optical drive slot in that 27” tall case Tell me how that ” slot takes up too