Write current switching in a data storage device using an effective footprint of a write pole
US10446184B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2018 |
| Grant date | Oct 15, 2019 |
| Priority date | — |
| Expiry date | Dec 17, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5539
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sequence of symbols is generated to describe a set of write data, the symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range. Bi-directional write currents are applied to a write pole to record the sequence of symbols to a magnetic storage medium. The write pole has an effective footprint with a downtrack length of mT, where m is an integer. The write currents are switched between a first rail current and a second rail current for alternating symbols, the write currents further transitioning to an intermediate current value for at least one channel clock period for symbols longer than 1T. Write currents are applied to the write pole when recording symbols having a length longer than mT using the effective footprint of the write pole as an interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.