Browse Prior Art Database

Zone Recording Flexible Diskette Drive Via Microprocessor Control

IP.com Disclosure Number: IPCOM000052028D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11

Publishing Venue

IBM

Related People

Authors:
Herald, RF Quinlan, WP [+details]

Abstract

Due to the nature of diskette recording, outer disk tracks are longer than inner tracks. The disk angular velocity and data rate have traditionally been constant. Zone recording is an attempt to maintain constant bit density by decreasing angular velocity or increasing the recording frequency, as the read/write head moves to the outer tracks. Zone recording involves partitioning the disk surface on which information is stored in concentric tracks, into groups of adjacent tracks to form zones. Within these zones either write frequency or disk speed is constant. Between zones they change. The smaller the zone in terms of the number of tracks within it, the less variation of flux changes per inch within a zone. A greater number of zones results in more angular speed changes.