Clipping level
The clipping level is a unit of measurement for security against surface defects and thus against write and read errors on floppy disks . The clipping level is given in percent and describes the ability to maintain the magnetic arrangement (and thus the contents of the floppy disk).
Good quality floppy disks have a clipping level in the range of 65–70%. Lower values, especially below 55%, indicate poor quality. In the 1990s, individual manufacturers advertised in the name of their floppy disks that they had a clipping level of 80%.