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Crosstalk Detection in a Magnetic Media System

IP.com Disclosure Number: IPCOM000074088D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Breitenbach, RC: AUTHOR [+2]

Abstract

Crosstalk between parallel channels in a multitrack magnetic media system is checked. A magnetic media controller (CU) receives a diagnostic command from the controlling CPU (central processing unit) which degates all CU error-detection circuitry. The CU then records and reads back a special record on a magnetic media. The command also effects read clipping level at a low predetermined threshold.

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Crosstalk Detection in a Magnetic Media System

Crosstalk between parallel channels in a multitrack magnetic media system is checked. A magnetic media controller (CU) receives a diagnostic command from the controlling CPU (central processing unit) which degates all CU error- detection circuitry. The CU then records and reads back a special record on a magnetic media. The command also effects read clipping level at a low predetermined threshold.

Initially, a diagnostic write is performed with a special data pattern recording no signals in a selected track of the parallel tracks. The special pattern causes the selected track to appear as a dead track to the CU. The circuitry and transducer associated with the selected track is to be checked for crosstalk from adjacent circuits and transducers.

Upon completion of the diagnostic write, the media is repositioned; then, a diagnostic crosstalk command is executed by the CU. The crosstalk command effects readback from the magnetic media without error correction. A software program in the CPU analyzes the data read back and checks for data bits in the selected track. Any bits received from the selected track indicate an excessive crosstalk situation. All of the tracks in the media system are sequentially checked in this manner.

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