Head arm having through hole for making head arm lightweight, head moving mechanism and disk unit having the head arm

摘要

A head arm includes a main body, partially located with a first area above a recordable medium. The main body includes a first surface opposite to the recordable medium and a second surface opposite to the first surface. A hole extends through the main body between the first and second surfaces. The main body also has a first connector portion connectible to a driving portion; and a second connector portion connectible to a head. The through hole is formed on only one side with respect to a line that halves the first area between said first and second connector portions.