Patent ID: 11915729
Assignee: MARVELL ASIA PTE LTD
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 12:
13. A storage device, comprising:
a magnetic data storage medium;
a write head for writing data onto the magnetic data storage medium;
a preamplifier configured to apply write current signals to the write head; and
control circuitry for controlling generation of the write current signals by the preamplifier for writing the data onto the magnetic data storage medium, the control circuitry comprising write logic configured to generate, from decoded source signals, data signals to be written onto the magnetic data storage medium by the write head, and magnetic pole control logic configured to:
detect 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, send instruction signals to the preamplifier to write the data by applying an initial pulse and then maintain, until a shut-off pulse, a steady-state write current having an amplitude less than the initial pulse,
determine a shut-off adjustment based on a predetermined delay,
initiate 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, send instruction signals to the preamplifier to write the data by applying the initial pulse without applying a steady-state write current before the data transition.