I have seen HDD docks which can take IDE or SATA 3.5" or 2.5" but not come across a caddy/enclosure which does the same guess you have to buy specific ones for the latter.

So HDDs docks arent meant to be connected all the time like caddy/enclosure?

I just need to see if my HDD is faulty or dead? Wouldnt use HDD as external HD which I assume can be done with both caddy and docking station.