I recently bought a pack of Sony IBM formatted high density floppy disks, the same pictured below. There's a "Special Cleaning Mechanism" logo displayed on the box, and the only information I can find about it is on the back which states:
Sony's Special Cleaning Mechanism protects your diskette and reduces chances of error with features that clean the diskette surface.
What "mechanism" was being marketed here, and how did it protect the floppy disks?
"sony" diskette cleaning patentmay turn up other patents of interest.