Disk drive with a biased actuator latch, and having a first permanent magnet that is larger than a second permanent magnet

A disk drive comprising:

• a disk drive base;
• a disk rotably mounted to the disk drive base;
• a ferromagnetic metal yoke structure that is attached to the disk drive base and that includes top and bottom magnet support plates;
• first and second permanent magnets fixed to the ferromagnetic metal yoke structure;
• an actuator pivotably mounted to the disk drive base, the actuator defining an actuator pivot axis about which the actuator pivots, the actuator including an actuator coil disposed between the first and second permanent magnets;
• and
• an actuator latch disposed adjacent to the actuator, the actuator latch including a biasing element that comprises a ferromagnetic material;
• wherein an overlapping portion of the first permanent magnet overlaps the second permanent magnet as viewed from a viewing direction that is parallel to the actuator pivot axis, and a protruding portion of the first permanent magnet does not overlap the second permanent magnet as viewed from the viewing direction.