Rental floor sanding machines have moved on a bit - even if HSS hasn't enti rely kept up.
The 'standard' ones HSS offer are drum sanders - lots and lots of dust. Lot s of power too - easy to produce digs in the floor.
At a higher price point, this sort of machine is being replaced with belt s anders:
formatting link
The more modern machines produce far less dust.
I recently hired this from HSS:
formatting link
It's a more basic version of the Trio machine, and uses 4 heads with random
-orbit action. A delight to use, and it really was just about dust-free.
These don't have the sanding power of drum/belt machines - but suited my pu rpose. I needed to refinish a new tongue & groove floor (the lacquer had re acted with the dye, producing a rather orange tint), and to sand an old flo or without reducing it to a 'new wood' appearance.
I'd also recommend a hand-held random orbit machine for edging over those e dgers HSS offer, as the HSS are a pure rotary action with a strong tendency to dig and cut.