I have a Black and decker random orbital sander. It's an 8 hole model, and does a decent job of dust extraction when I have 8 hole disks. Lately, the local borg only carries Norton disks with a ring of many 1/8" (approx) holes that is suposed to accommodate both 8 and 5 hole machines. There's no way I can see to attach a vacuum to the dust bag port, but with these disks, the dust mostly ends up on the workbencch, and very little in the bag. Very, very little.
Is this just me and my ROS, or do other people get the same result witth these disks? It's annoying enough to make me search out a source of 8 hole disks, but at present I have about 100 mini hole disks in various grades. That's a lot of dust to get through them all.