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Majority Vote and Minority Polling Recovery Procedures for Files

IP.com Disclosure Number: IPCOM000038924D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Cunningham, EA [+details]

Abstract

Most data bits from a storage file are correct most of the time, some may be wrong a small fraction of the time, and a very few might be wrong more than half the time, but bits are almost never totally wrong. Rereads can recover those bits that are wrong a very small fraction of the time, but are nearly useless for rates which produce several or more errors per sector. Majority vote is the process of voting on a bit by bit basis of the values read on several different revolutions. The process greatly reduces the effect of random noise and allows the recovery of signals having very low signal-to-noise ratio. This allows recovery of failure rates up to 100 times higher than practical by a reread process.