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Disk Selection And Opening In Stacked Flexible Disk Storage Apparatus

IP.com Disclosure Number: IPCOM000068397D
Original Publication Date: 1979-Aug-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue

IBM

Related People

Authors:
Allgood, HB Hansen, NH Stephens, TR [+details]

Abstract

Axial disk locations are identified by one of a set of spiraling edge marks of the magnetic-type disks. The marks are either optically or magnetically sensed. Rotational position of the marks with respect to zero position indicator (ZPI) of a digital tachometer indicates which disk is being accessed. Plural groups of spirals are employed with coarse positioning of the carriage achieved via a stepper motor using known open-loop positioning techniques. Positioning within a group of spirals is achieved, as described below.