Improper technique is the number one cause of the problems that stem from sanding. If you sand against the wood grain of your hardwood floor, you will cause splintering. Be sure to sand along with the wood grain, or certain damage will result.
Floor sanders are ideal for wood floors because their size and power help to ease the sanding process. Many amateurs use the wrong tools. This can lead to severe back pain and uneven, incomplete sanding.
Palm and power sanders are generally not appropriate for sanding wood floors. Do-it-yourselfers will usually find it difficult to maintain enough consistent force when using a palm sander. This can lead to exhaustion and incomplete sanding. Power sanders are effective when used properly. However, they can be hard on the back and difficult to maneuver.