It uses a full size drive. Here are two that will work wonderfully:
https://www.newegg.com/Product/Product.aspx?Item=N82E16827135204
https://www.newegg.com/Product/Product.aspx?Item=17D-0005-00008&ignorebbr=1
If you're interested in getting an abnormally quiet drive, consider this one:
https://www.newegg.com/Product/Product.aspx?Item=N82E16827249086&ignorebbr=1
Things might get interesting when you go to remove the front panel. On the left side, the plastic latches holding it in place are easily visible once you have the side panel off. No problem there.
On the right side, you can't remove the side panel, and I can't tell what kind of latches they use to hold it in place.
When faced with this kind of setup, I usually unclip the latches that I can see first, and place an old credit card or paperclip under them to keep them from re-latching. If you're lucky, the panel will be on hinge locks on the other side. If that's the case, you can simply (gently, you don't want to force the front panel) pull on the left side of the panel.
If you encounter resistance when pulling the left side of the panel, that means that there are clips on the other side. You should be able to access all of the clips, but it might take some looking around to find them all.
If you're not comfortable with the process of removing the front panel, you can always get an external drive instead. They are a bit more expensive, but should get the job done. Here's a model worth considering:
https://www.newegg.com/Product/Product.aspx?Item=N82E16827136267&ignorebbr=1