Hard disk drive having functions of free fall detection and emergency parking for the read/write head before the free fall shocking

摘要

An HDD(Hard Disk Drive) having a function of sensing a fall as sheltering a head in case of fall impact is provided to previously sense whether a free fall of a device occurs, and to shelter a read/write head taking charge of recording/reproducing of data to a safe parking position, thereby obtaining impact resistance performance required in a mobile environment. A flying height sensor measures height in which a rotating body flies on a spindle motor(100), in real time. A monitor unit monitors the flying height detected from the sensor, and generates a free fall signal if it is decided that an HDD is in the free fall state. A central controller starts to shelter a read/write head(161) by responding to the free fall signal. The flying height sensor is positioned on a base member mounted with the spindle motor, and measures the flying height of the rotating body from the base member to output the measured height as an electric signal.