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Dasd Storage Optimization by Sector Address Scrambling

IP.com Disclosure Number: IPCOM000043090D
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04

Publishing Venue

IBM

Related People

Authors:
Altmann, WC [+details]

Abstract

This article describes a method of connecting all of the unused sectors on a memory medium to appear as one contiguous region and presents a novel approach to accessing data stored as a recorded image on a mass storage medium. The advantage of this approach is in the maximum utilization of physical storage capability with minimal impact to speed and with efficiency of data transmission, by scrambling the addresses of the various stored data storage locations. It thus eliminates the need to physically alter data in memory in order to optimize storage since only the addresses stored in the controller's physical hardware need be updated. In present computer systems both a directory and free list must be maintained for the system to know where to delete and allocate files.