Disk sanders work by spinning a disk of sandpaper rapidly in a circle. They are available as either handheld or table mounted models.
Disk sanders remove a lot of material quickly – like a grinder – making them mainly suitable for rough work, such as shaping edges and removing paint.
A handheld, heavy duty disk sander – called a floor edger – is used for sanding floors next to walls and doorways.
Sandpaper: Disk sanders require special round sanding disks.