Designs for multiple perpendicular magnetic recording (PMR) writers and related head gimbal assembly (HGA) process
US10366713B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2018 |
| Grant date | Jul 30, 2019 |
| Priority date | — |
| Expiry date | Mar 6, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59605
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pad/trace line layout for a PMR writer structure having two or more writers on a slider, and a process for selecting the best of the multiple writers is disclosed. Each writer is individually probed with a spin stand test device to generate performance results including bit error rate (BER), and area density capability (ADC). After the best writer is determined, the slider is integrated in a HGA. Only the best writer is connected through trace lines to a preamp to enable functionality. At least one trace line has a plurality of arms that enable flexibility in connecting the best writer to the preamp while other arms are not connected. In some embodiments, all writers share a common W− pad that is connected to the preamp through one of two trace lines while the other trace line has one of the plurality of arms connected to the best writer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.