I run a drum sander with either 100 or 120 paper (can't remember which). Nonetheless, it leaves some pretty good tracks in the wood which I sand out with my random orbit sander. I usually have to hit it with 80 grit and make several passes and even then I usually have to hand sand a few little spots to kill off the final scratches. After all that I move onto the higher grits and it mostly seems to work out.
Does this sound about normal? I'm getting ready to order some new belts for my drum sander (80, 120 grit) and some new pads for ROS sander. Just want to make sure I'm not ordering unnecessary stuff.