yeah you can use a sata adapter to use any hdd as an extra external. Might want some kind of case for it. Nothing special required.
I use something like this
https://www.amazon.com/StarTech-com-SATA-USB-Cable-USB3S2SAT3CB/dp/B00HJZJI84/
Personally, I added a 480gb SSD as external storage where I keep my most played games that benefit from an SSD. cuts some load times in half or more, but you can just use that old HDD if all you want is some cheap extra space.
you just connect it via usb, then set it up as external storage in the options. done.
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