It’s generally worth it, which is why people do it.
Smaller capacities might even be an older green label drive, but will still work okay.
If it has been used, then it’s probably gonna last a while.
IIRC, there is a bell curve, with a bunch of drives dying in the first few months, then fine for years, then a load die after a few years, relatively close to each other.
If your power supply outputs 3.3v on a specific pin on the SATA power connector, it will cause the drive to not work because it is constantly resetting.
Only an issue with some power supplies, as some don’t output 3.3v on that pin. Might not be an issue with that specific model of drive, it’s definitely an issue with most/all 8tb USA easystores, but IDK for that model, depends on if it was supposed to be a consumer or a server drive.
Can be worked around with a small piece of tape, or by using a molex to sata adapter.
IMO its simply new tech driving the price down. With first ssd. Then/ now Nvme drives achieveing big advances as well as more and more new systems running those exclusively the old spinning drives are just getting cheaper and cheaper.
Warranty also tends to be shorter on external drives. Usually the 2 year minimum (in the EU). If I’m not mistaken most NAS and server drives come with much longer warranties.
I’d check but Western Digital apparently has an idiotic password policy and the password I used to create an account is now, apparently, too long. If I needed another reason to stay away from their products after the SMR and RPM shenanigans I have now found one…
FWIW The drives I have shucked have all had identical firmware to a WD Red. I’ve yet to find anyone getting anything different. Some have reported Reds or White labels but they all seem to be running identical firmware. YMMV