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Adding an Electrical Contact and Connection to the MR Shield(s)

IP.com Disclosure Number: IPCOM000015251D
Original Publication Date: 2002-Feb-15
Included in the Prior Art Database: 2003-Jun-20
Document File: 1 page(s) / 39K

Publishing Venue

IBM

Abstract

This is part of the Potential Matching AE system solution disclosure. To eliminate Electrostatic Discharges (ESD) from occurring among closely spaced elements (heads and media) inside a Hard Disk Drive (HDD), a solution is to prevent any potential differences from developing among the elements. To achieve that, this invention adds a potential matching output to the Arm Electronics (AE). The potential matching circuitry in the AE will connect to a contact on the MR head via a line in the interconnect. The potential matching contact on the MR transducer is connected to the MR shield or shields.

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Adding an Electrical Contact and Connection to the MR Shield(s)

This is part of the Potential Matching AE system solution disclosure. To eliminate Electrostatic Discharges (ESD) from occurring among closely spaced elements (heads and media) inside a Hard Disk Drive (HDD), a solution is to prevent any potential differences from developing among the elements. To achieve that, this invention adds a potential matching output to the Arm Electronics (AE). The potential matching circuitry in the AE will connect to a contact on the MR head via a line in the interconnect. The potential matching contact on the MR transducer is connected to the MR shield or shields.

As MR element to media spacing continues to decrease to support ever higher areal density HDD designs, even relatively low potential differences between the MR head and the media can cause discharge events to occur with disastrous consequences leading to drive failures. Unfortunately demands for ever faster drive performance often dictates putting common mode potentials that differ from the preferred equipotential such as Ground onto the MR sensor contacts. For example, to speed up write-to-read recovery time, a significantly high common mode potential maybe applied to the MR sensor. This potential difference can then capacitively couple to the adjacent MR shields. In the event of a contact with an asperity or momentary low head to disk spacing, discharge between the MR sensor and the media can occur and this ca...