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Error Recovery Procedures for Magnetic Tape Recorders

IP.com Disclosure Number: IPCOM000083514D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Golz, WR: AUTHOR [+3]

Abstract

In fully automated tape libraries such as shown in U. S. Patents Burke et al 2,941,738 and Johnston et al 3,825,208, error conditions may occur in the automatic loading and threading of magnetic tape onto a digital signal magnetic recorder. In some instances, when an error has occurred and the tape is removed prior to diagnostics, the error condition may also be removed. While this can permit recovery from some error conditions, it does not facilitate identification of the cause of such error conditions.

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Error Recovery Procedures for Magnetic Tape Recorders

In fully automated tape libraries such as shown in U. S. Patents Burke et al 2,941,738 and Johnston et al 3,825,208, error conditions may occur in the automatic loading and threading of magnetic tape onto a digital signal magnetic recorder. In some instances, when an error has occurred and the tape is removed prior to diagnostics, the error condition may also be removed. While this can permit recovery from some error conditions, it does not facilitate identification of the cause of such error conditions.

To rectify the above-indicated dilemma, each reel of tape or other unit of magnetic storage, such as strips, flexible disks, and the like, which are movable from a storage array to a recorder, includes both a data recording area and a diagnostic area. Unique diagnostic patterns known in the digital signal recording area are recorded in the diagnostic area along with control information. Upon detection of a load, thread, or other error condition which does not inhibit access to the diagnostic area by a transducer, detection of the error condition causes an interrupt to a controlling system.

The controlling system then invokes automatic online diagnostic tests, without removing the record medium from the digital signal recorder. In this manner, the error conditions are identified prior to retrying recorder operation for attempting recovery from the error condition. In this manner, the error conditions are more r...