US 11,915,729 B1
Disk writing mode with timing control of main pole relaxation
Kai Wu, Singapore (SG); Hao Fang, Eden Prairie, MN (US); and Jorge Estuardo Licona, San Jose, CA (US)
Assigned to Marvell Asia Pte Ltd, Singapore (SG)
Filed by Marvell Asia Pte Ltd, Singapore (SG)
Filed on Jan. 19, 2023, as Appl. No. 18/156,852.
Claims priority of provisional application 63/407,143, filed on Sep. 15, 2022.
Claims priority of provisional application 63/318,378, filed on Mar. 9, 2022.
Claims priority of provisional application 63/318,366, filed on Mar. 9, 2022.
Int. Cl. G11B 20/10 (2006.01); G11B 11/105 (2006.01); G11B 5/09 (2006.01)
CPC G11B 5/09 (2013.01) 19 Claims
OG exemplary drawing
 
1. A method for writing data to a magnetic data storage medium, the method comprising:
detecting whether duration, before occurrence of a data transition, of data to be written exceeds a predetermined threshold; and:
when the duration, before the occurrence of the data transition, of the data to be written exceeds the predetermined threshold, writing the data by applying an initial pulse and then maintaining, until a shut-off pulse, a steady-state write current having an amplitude less than the initial pulse,
determining a shut-off adjustment based on a predetermined delay,
initiating the shut-off pulse at a time that is based on one bit period prior to the occurrence of the data transition, adjusted by the shut-off adjustment, and
when the duration, before the occurrence of the data transition, of the data to be written is at most equal to the predetermined threshold, writing the data by applying the initial pulse without applying a steady-state write current before the data transition.