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Error Detection in Digital Magnetic Recording

IP.com Disclosure Number: IPCOM000075606D
Original Publication Date: 1971-Oct-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Faircloth, CL: AUTHOR

Abstract

When variations in bit spacing are of no concern and data format can be ignored due either to the mechanical reliability of the system or to the decoding scheme used, other errors which occur during recording on magnetic media can be detected during a check-read operation.

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Error Detection in Digital Magnetic Recording

When variations in bit spacing are of no concern and data format can be ignored due either to the mechanical reliability of the system or to the decoding scheme used, other errors which occur during recording on magnetic media can be detected during a check-read operation.

A resettable up/down counter is incremented during recording for each change in the direction of the write current applied to the record coil of the head. The counter is then decremented during the check-read operation, once for each voltage peak produced at the head by a change in magnetic flux. Since the changes in magnetic flux are caused by oxide orientation changes in the media and since there should be a corresponding change in media oxide orientation for each change in write current, at the end of the check-read operation, the counter will have decremented to its original state if no error occurred.

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