flying height; head gap
Technical computing term for the distance between a hard disk drive's read/write head and the disk surface.
The flying height of a hard disk is controlled at the nanometer level.
Compound of 浮上 (ふじょう, 'floating' or 'flying') and 高 (こう, 'height'), referring to the gap between a read/write head and the disk surface in hard disk drives.