US 11,688,423 B2
Split-actuator disk drive that uses microactuator feedforward to reduce effects of cross-actuator coupling
Gary W. Calfee, Santa Clara, CA (US); Richard M. Ehrlich, Saratoga, CA (US); Thorsten Schmidt, Livermore, CA (US); and Gabor Szita, Mountain View, CA (US)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION, Tokyo (JP)
Filed on Dec. 20, 2021, as Appl. No. 17/556,844.
Application 17/556,844 is a continuation of application No. 16/879,690, filed on May 20, 2020, granted, now 11,205,450.
Prior Publication US 2022/0115038 A1, Apr. 14, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G11B 5/55 (2006.01); G11B 5/48 (2006.01); G11B 5/596 (2006.01)
CPC G11B 5/5586 (2013.01) [G11B 5/4813 (2013.01); G11B 5/5547 (2013.01); G11B 5/5578 (2013.01); G11B 5/59622 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A disk drive comprising:
first and second heads;
a first microactuator configured to move the first head relative to a disk;
a second microactuator configured to move the second head relative to a disk;
a first arm to which the first head and the first microactuator are mounted;
a second arm to which the second head and the second microactuator are mounted;
a first controller configured to generate a first control signal for moving the first arm and a second control signal for the first microactuator, in response to a first position signal generated by the first head;
a second controller configured to generate a third control signal for moving the second arm and a fourth control signal for the second microactuator, in response to a second position signal generated by the second head;
a third controller configured to generate a feedforward correction signal for modifying the second control signal based on a first transfer function, wherein the first transfer function models the feedforward correction signal as a function of the third control signal; and
a notch filter configured to generate a fifth control signal for the first microactuator based at least on the feedforward correction signal.