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I've done some floors. The drums sanders let you go pretty fast, but yeah, when you are using the rough grit they remove a lot of material fast.
As Randy said above, after using a drum sander, it is critical that you use a floor buffer with sanding screens. Otherwise you are left with small ridges in the surface.
Regardless of what sander you use (I would go with the orbital), it is critical that the floor is absolutely free of dust when you apply your top coat. Vacuum the floor, then tack cloth, then vacuum again. Have your work area setup so that your not tracking dust back onto the floor after cleaning.
My last bit of advice? Refinishing floors is a biatch! You can skip going to the gym that week, I promise you.
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