Patent ID: 8730623

Claim:
A head stack assembly, comprising: a pivot bearing assembly having a main body comprising a first end surface and a second end surface, and a flange extended from the main body and located between the first and second end surfaces, the flange having a first interface adjacent the first end surface of the main body and a second interface opposite to the first interface; one drive arm mounted on the main body and secured on the first interface of the flange; and one fantail spacer mounted on the main body and secured on the second interface of the flange, the fantail spacer being physically separated from and connected to the drive arm via the flange; wherein the drive arm has a mounting hole defined therein, and an upper portion of the main body from the first end surface to the first interface of the flange is received in the mounting hole, and the fantail spacer has a through hole defined therein, and a lower portion of the main body from the second interface of the flange to the second end surface of the main body is received in the through hole.