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Formatting of Variable Length (CKD) Records on DASD Tracks Having Periodically Occurring Unwritable Segments

IP.com Disclosure Number: IPCOM000051853D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11

Publishing Venue

IBM

Related People

Authors:
Dishon, Y Schor, MI [+details]

Abstract

This article relates to a method for minimizing unused available recording lengths when formatting variable length CKD-type records on DASD (direct-access storage device) tracks periodically interrupted as by way of sector servo information. In such circumstances, recording gaps define time intervals between record fields (count, key, and data). During these intervals READ/WRITE operations are suspended. The gaps include a first extent dedicated to time delay and a second extent dedicated to synchronizing the recording channel to a servo drive.