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Format Command Processing in a Diskette Adapter

IP.com Disclosure Number: IPCOM000039772D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Davis, KD Kerchberger, SW [+details]

Abstract

This article describes a format command implementation used in a diskette adapter. A single command interface provides minimal host processor and bus activity, while the format process provides rigorous media verification and optimal performance. The process formats and verifies the media in two quick passes. The first pass formats and verifies a stress pattern in two revolutions per track. The second pass verifies proper cylinder placement, scanning the diskette in greater than six cylinders per diskette revolution. Error recovery is completely internal to the diskette adaptor. The format command also creates and maintains an error map and statistical information record. The algorithm in the figure illustrates the format process.