Replacing CD-ROM drive with HDD

Hello everyone, Im new here and hope I followed the rules about posting properly. Im upgrading my current HDD to a SSD that I pulled from a laptops who mother board took a dump. since its on the smaller side I was going to use it as my boot drive. I also saw an interesting article about a company that offers an adapter where you can remove your CD-ROM drive and put a drive in there. I was planning on putting my current drive in this adapter. The main question I have now is using this second drive going to be exactly the same as a external? Ive never been on a computer with 2 drives. Thank you for the help in advance.

P.S. a second question I thought of, does anyone have a good cloning software they would recommend? Most of the ones Ive used take up way too much storage for a recovery and partition the drives in a way that I dont like. Thanks again in advance.
 
How large is the SSD? If you look carefully, most cases come with 2 HDD slots, so there's no need to buy a 5 1/4 to HDD adapter
 
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