Browse Prior Art Database

Storage of Modified Records

IP.com Disclosure Number: IPCOM000081923D
Original Publication Date: 1974-Sep-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Byram, JC: AUTHOR

Abstract

Records stored on magnetic medium tracks and which have been accessed and modified, are again stored on the original track or on the original and following tracks. By again storing the records in this manner, magnetic media utilization, realtime, form of printed verification listing, and overall human factors considerations are improved.

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Storage of Modified Records

Records stored on magnetic medium tracks and which have been accessed and modified, are again stored on the original track or on the original and following tracks. By again storing the records in this manner, magnetic media utilization, realtime, form of printed verification listing, and overall human factors considerations are improved.

In order that revised and/or modified records retain the same record number and maintain the same numerical order, upon a store command, a calculation is made to determine if the modification to the records has created an overflow condition. If there will be no overflow, the records are simply written back onto the original track and the store operation is complete. Should the calculation indicate an overflow, one record at a time is deducted until a fit is achieved.

The deducted records are residue and are stored at the beginning of the next track, along with records assigned to that track. Of course, if the residue plus the records assigned to the next track would cause an overflow condition, none of the residue is combined with the records assigned to the next track. In this instance, a new track is assigned to the residue and placed between the two tracks involved. A compromise is thus presented between efficient magnetic media utilization and operator response time.

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