What drives is everybody using and can you use a 3.5 drive
You can’t go wrong with Crucial, and last I checked, you can go up to 4-terrabytes.
Something like this: https://www.amazon.com/dp/B07YD579WM
I am using a Kingston unit and no problems. Samsung EVO is also a great option.
Only 2,5"
It wouldn’t fit internally, if that’s what you mean. Only 2.5 inch drives (up to 9mm thick, I think).
I’m using and am happy with one of these:
Samsung 860 QVO 1TB Solid State… https://www.amazon.com/dp/B07L3D19MY?ref=ppx_pop_mob_ap_share