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Independent Disk Drive Head Position Information Encoding

IP.com Disclosure Number: IPCOM000013092D
Original Publication Date: 2000-Apr-01
Included in the Prior Art Database: 2003-Jun-12

Publishing Venue

IBM

Abstract

Radial and circumferential position information can be stored on the disk surface by mircrotexturing the surface of the disk. This texture is placed on the disk with a coding system that allows a passing head to know its position independent to the written data that is a normal part of the disk drive function. The microtexture affects the cooling of the MR element and this gives a low frequence pulse that can be detected from the head directly. Today files can have the problem that they become lost with respect to the radial position. This can be used as a primary source of position information to allow a higher level of packing efficiency or as a scondary code if the head gets lost. 1