The reason you want those holes is to allow the sander to suck away the sawdust and throw it in the dust collection bag or chamber. If it doesn't do that, the dust gets trapped under the sander disk and keeps it from sanding efficiently.
For heavy sanding and stripping, you need coarse sandpaper measuring 40- to 60-grit; for smoothing surfaces and removing small imperfections, choose 80- to 120-grit sandpaper. For finishing surfaces smoothly, use superfine sandpaper with 360- to 600-grit.
When shopping for sandpaper, you'll see numbers such as 80-grit, 100-grit, or 200-grit. Keep in mind: The higher the number, the smaller the grains and the finer the sandpaper grit. And, conversely, lower numbers indicate larger grains and overall coarser sandpaper.
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