One of the greatest risks when using a floor sander is perhaps leaving marks or imprints from the sander all over the floor. These marks are commonly known as 'chatter marks'. The major factors that can cause such a problem are most probably the weight and bulkiness of the sanding machine which make it difficult to handle.
For amateurs, it is quite impossible to manage a sanding job without leaving some sort of mark on the floor. Even the professionals may have tough times preventing any and all marks from their sanders.
Avoiding these marks can never be easy but if you could take the following precautions into mind before sanding the floor, you can do it just fine. Firstly, is to determine the surface texture of the floor, as different types of sanding machines are required for different types of surface. A floor that is already stained will require a different sanding procedure than a floor that is unfinished.
A floor applied with a blond finish (a finish directly to the wood) will not require an intensive sanding as compared to staining wood floors. It is always best to seek for a professional to do the sanding if you plan to stain your wood floors.
On the other hand, if you are working on some really old floors, you should also consult a professional floor refinisher to help identify the correct type of equipment which will be suitable for the job as to avoid any potential damage to your floor if you were to use the wrong sander. If you pick a sander that is too powerful, you could pretty much end up with holes in your floors and that can cost you a new floor instead of just simply refinishing it.
While it is always best to hire a professional to help in your floor sanding job, it wouldn't hurt if you want to do it yourself to save up some money if it is just a simple refinishing job over a small area, say about less than 600 square feet, rather than an entire home which you will be seriously needing a professional.