Patent ID: 7630160

Claim:
A magnetic disk drive, comprising: a magnetic disk medium; a magnetic head slider including a recording element for recording magnetic information onto the magnetic disk medium, a playback element for playing back magnetic information from the magnetic disk medium, and a heater for regulating a distance between each of the recording and playback elements and the information recording medium; a carriage assembly for supporting the magnetic head slider and for moving the magnetic disk medium along a radial direction of the magnetic disk medium; and a preamplifier that amplifies and passes a recording signal to the recording element, that amplifies a playback signal of the playback element, and that supplies a current to the heater, the magnetic disk drive being characterized in that the preamplifier includes an air pressure sensor integrally formed with the preamplifier, and regulates an electricity supply amount for the heater in accordance with an output of the air pressure sensor.