sanders

I purchased a cheap black and decker orbital sander but the sanding discs don’t last anytime at all. When I take them off though they still feel rough. What do you all recommend? I’m redoing a tv stand right now but would eventually like to do my kitchen cabinets. Thank you for your insight...

I have a 12 x 10 foot room with a hardwood floor that needs to be refinished. Do you think a good hand sander would be good enough. I'd hare to have to rent a big floor sander for $75 for such a small room. Suggestions?