Hard disk drive with write gap conductive structure and dual independent interface voltage control circuitry

A hard disk drive (HDD) comprising:

• a rotatable magnetic recording disk;
• a gas-bearing slider maintained over the surface of the disk when the disk is rotating;
• a write head on the slider comprising an electrical coil for generating a write current, an electrically conductive main pole, an electrically conductive trailing shield and an electrically conductive structure between the main pole and the trailing shield;
• a read head on the slider;
• a heater on the slider;
• an embedded contact sensor (ECS) on the slider;
• a first interface voltage control circuitry (IVC1) electrically coupled to one of said coil, read head, heater and ECS, the IVC1 being adapted to provide substantially zero electrical potential between the slider and the disk;
• and
• second interface voltage control circuitry (IVC2) coupled to the electrically conductive structure through the main pole and trailing shield, the interface voltage control circuitry being adapted to provide a negative electrical potential at the main pole and trailing shield relative to the disk.