MFM floppy disk write precompensation

On 08/11/2013 03:29 PM, John Wilson wrote: Sure, remove the cookies from the jackets, bake them at 140F for 4 or 5 hours, then apply a good-quality synthetic auto paint sealant--Klassic seems to be pretty good. No abrasive polishes, please. That seems to provide a slick enough surface to keep the heads from grabbing the oxide--at least for a few reads. The alternative is disaster. I've wondered about trying some of the dry silicone lubes, but they mostly seem to be aerosols and use some sort of solvent as a carrier. Probably not good for media, but I haven't tried. Basically, you want to prevent the heads from "grabbing" the oxide. Once that starts, you're looking at a circle that you can see through. Get yourself an old box of Wabash floppies (any size) and play around. I use perc as a head cleaner--isopropanol doesn't seem to be as effective. I'll be interested to hear of others' experiences. --Chuck