Patent ID: 8422174

Claim:
A head stack assembly, comprising: at least one head gimbal assembly; a controlling circuit for controlling the head gimbal assembly; and an actuator coil assembly comprising at least one top surface for mounting the head gimbal assembly and a side surface for mounting the controlling circuit; wherein the head gimbal assembly has a first connection region parallel to the top surface, the first connection region has multiple first terminal pads formed thereon; the controlling circuit has a second connection region with multiple second terminal pads formed thereon, the second terminal pads are arranged in at least one row which is parallel to the top surface and the side surface respectively, the first terminal pads are bonding to the corresponding second terminal pads to implement an electrical connection, wherein the first connection region of the head gimbal assembly has a first connection surface that the first terminal pads are formed on, the second connection region of the controlling circuit has a second connection surface that the second terminal pads are formed on, and the first connection surface is perpendicular to the second connection surface.