Patent ID: 8848318

Claim:
A magnetic disk drive apparatus comprising: a magnetic head slider apparatus, the magnetic head slider apparatus comprising: a magnetic head slider, the magnetic head slider including: a leading pad formed on a leading side on a first surface of a slider main body, the leading pad contacting a medium surface when a disk is stationary; a trailing pad formed on a trailing side on the first surface of the slider main body, the trailing pad contacting the medium surface when the disk is stationary; a pair of side pads formed in an airflow direction on the first surface of the slider main body, the side pads contacting the medium surface when the disk is stationary, the leading pad, the trailing pad, and the side pads each having two step surfaces via shoulders extending in a direction of being farther from a contact surface of each pad; a main magnetic pole write head; a magnetoresistive read element; a near-field transducer disposed at a position close to the main magnetic pole write head; and a waveguide for guiding external light to the near-field transducer, the main magnetic pole write head, the magnetoresistive read element, the near-field transducer, and the waveguide being disposed inside the magnetic head slider; a submount disposed on a first side surface of the magnetic head slider, the submount including a light-emitting element that emits light for the near-field transducer; and a suspension for supporting the magnetic head slider and the submount integrally at a leading end portion thereof, the suspension including a dimple that applies a load to the magnetic head slider, wherein letting “w” be a length of the magnetic head slider in a width direction and “yp” be a distance between an end of a side surface of the magnetic head slider and a position of the dimple, the “yp” and the “w” fall within a range that satisfies a condition represented by yp/w<0.5 or yp/w>0.5; a magnetic recording medium disposed rotatably so as to face a magnetic head slider of the magnetic head slider apparatus; a slider drive unit for driving the magnetic head slider apparatus; a disk drive unit for rotatably driving the magnetic recording medium; and a signal processing circuit for processing read/write signals to be supplied to a magnetic head of the magnetic head slider apparatus.