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Transducer Feedthrough Checking

IP.com Disclosure Number: IPCOM000073625D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Breitenbach, RC: AUTHOR [+3]

Abstract

During a recording operation in a magnetic media system, the feed-through characteristics from the write windings to the readback windings of a multiple gap transducer are checked. In a recording system having both a read gap and write gap scanning the same track, the write gap during a writing operation is upstream from the read gap. While recording data, it is common practice to read the data after it is recorded for verifying the recording process. During an initial portion of recording a block of data, the read gap is still scanning the inner record gap (IRG or IBG). At this time, there should be no signals on the read bus between the transducer assembly to the detection circuits. Feedthrough is easily checked by monitoring signals on the read bus during this short period of time.

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Transducer Feedthrough Checking

During a recording operation in a magnetic media system, the feed-through characteristics from the write windings to the readback windings of a multiple gap transducer are checked. In a recording system having both a read gap and write gap scanning the same track, the write gap during a writing operation is upstream from the read gap. While recording data, it is common practice to read the data after it is recorded for verifying the recording process. During an initial portion of recording a block of data, the read gap is still scanning the inner record gap (IRG or IBG). At this time, there should be no signals on the read bus between the transducer assembly to the detection circuits. Feedthrough is easily checked by monitoring signals on the read bus during this short period of time. If a predetermined signal amplitude appears on the read bus, excessive feedthrough is indicated. When such feedthrough is detected, a sense bit is set indicating to the supervisory program of such excessive feedthrough. The control of such sensing is easily implemented using microprogram techniques.

This technique is particularly useful where there is electrical compensation for feedthrough designed into a machine. Such electrical compensation may drift with time and usage out of desired adjustment. This checking, performed on a real time basis, with each data recording operation, continually monitors the effectiveness of such electrical compensation....