7200 RPM is actually quite fast when you look at it. For reference many high performance cars don’t actually break 7000 RPM.
Had a whole bunch of old HD’s a while back I needed to get rid of.
I’ve got video stashed somewhere. I should dig that up. Yes, I ran it without the cover on (I removed the heads though since I believe this is a glass platter).
Also: those magnets are really strong and lots of fun.