Head stack assembly, manufacturing method thereof and multi-disc magnetic storage device

A manufacturing method of a head stack assembly, comprising:

• manufacturing a group of magnetic heads sequentially;
• measuring a core width or a write element width of respective magnetic heads with respect to the group of magnetic heads sequentially manufactured;
• classifying the group of magnetic heads into plural groups based on the core width or the write element width of respective measured heads;
• and
• assembling magnetic heads of respective classified groups, to prescribed actuator arms in the head stack assembly,
• wherein in the classifying, the tolerance of the core width or the write element width of the magnetic heads assembled to the inside actuator arms is narrower than the tolerance of the core width or the write element width of the magnetic heads assembled to the outside actuator arms.

A manufacturing method of a head stack assembly, comprising:

• manufacturing a group of magnetic heads sequentially;
• measuring a core width or a write element width of respective magnetic heads with respect to the group of magnetic heads manufactured;
• classifying the group of magnetic heads into at least magnetic heads having the core width or the write element width within the tolerance in which magnetic heads are assembled to inside actuator arms, and magnetic heads having the core width or the write element width within the tolerance in which magnetic heads are assembled to outside actuator arms, based on the core width or the write element width of respective magnetic heads measured in the measurement step;
• and
• assembling respective magnetic heads classified in the classification step to corresponding actuator arms,
• wherein in the classifying, the tolerance of the core width or the write element width of the magnetic heads assembled to the inside actuator arms is narrower than the tolerance of the core width or the write element width of the magnetic heads assembled to the outside actuator arms.