Always use the dust port. Either hook it up to a dust collection system or use your shop vacuum. That will keep nearly 100 percent of that fine dust from filling your shop with dust (photo below).
Never sand on the right half of the disk (photo below). That will drive dust up and into the room even with a vacuum running.
Only sand on the side of the disk that’s left of center. That will drive the dust into the dust collection port and into the dust collector.
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