Sanding Wood Floor -Equipment

All weekend I was sanding wood floors. The rented wood floor sanding equipment -well machine- worked great and was easy to handle. It's a belt sander that can be rented at Home Depot for less than $60/day. With all the sandpaper included sanding all the wood floors downstairs cost us $199. I started with the roughest sandpaper available which was 24 grit and finished off with 80. The edge sanding afterwards is really the hard part...