US 11,942,123 B1
Measuring VCM radial location using flex circuit shape during spiral write
Gary W. Calfee, Santa Clara, CA (US); Rodney Ngai, Sunnyvale, 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 Mar. 1, 2023, as Appl. No. 18/177,051.
Int. Cl. G11B 5/596 (2006.01)
CPC G11B 5/59688 (2013.01) 20 Claims
OG exemplary drawing
 
1. A method of writing servo information in a disk drive that includes a magnetic head and a flexible printed circuit board (FPCB) coupled to an actuator for the magnetic head, the method comprising:
receiving a signal based on an electrical property of a material included in the FPCB, wherein the electrical property of the material changes as the actuator moves;
determining a radial position of the magnetic head relative to a disk of the disk drive based on the signal; and
controlling a radial velocity of the magnetic head relative to the disk of the disk drive based on the radial position.