I have a 3.5" drive that I would like to use for backup as an external drive. But, i would prefer not to buy a hard drive enclosure. Since I will have multiple 3.5" hard drives that I will be using this way, it seems silly to have to spend money on several hard drive enclosures. I do have the needed connectors and cords, which I could use for all of the back up hard drives. I couldn't find much information when reading online except a couple of mentions to not do this long term (and they weren't clear on their reasoning behind that statement). I suppose if I have it just sitting on my desk I might be able to hear it vibrating, but that probably wont bother me since I will just occasionally be hooking it up to write a disk image of my C drive. What's the reasoning behind having a hard drive enclosure (besides the wiring that might come with such purchases). I saw one article that showed a home made external hard drive build that consisted of a hard board box and foam. I would think that the foam is not such a good idea in case the hard drive reaches a high temperature at some point. Here is the article on that.. https://www.wikihow.com/Make-Your-Own-External-HD-Enclosure Should I avoid such materials if I build my own?