In a disk drive, the tendency of a flying head to physically engage a constant-speed data recording disk when the drive is operated at an altitude higher than the altitude at which the drive was manufactured is tested by. During manufacture of the drive, the constant disk speed is reduced to a lower...http://www.google.co.uk/patents/US5666237?utm_source=gb-gplus-sharePatent US5666237 - Method for mapping thermal asperities of a magnetic recording surface in data storage device
