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Compatibility Verification

IP.com Disclosure Number: IPCOM000037049D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Anderson, CA: AUTHOR [+6]

Abstract

A procedure is described which verifies compatible service parts during service of Direct Access Storage Devices (DASD). Data stored on a DASD are difficult to recover when DASD failure occurs. The procedure supports a philosophy of replacing components on a DASD that prevent the loss of data.

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Compatibility Verification

A procedure is described which verifies compatible service parts during service of Direct Access Storage Devices (DASD). Data stored on a DASD are difficult to recover when DASD failure occurs. The procedure supports a philosophy of replacing components on a DASD that prevent the loss of data.

As the DASD gets into production, engineering changes are applied to the device that could make the electronics assembly and the head disk assembly (HDA) incompatible with parts produced before the change. Though the parts are determined to be incompatible, they may operate under nominal conditions, giving the impression of satisfactory performance when the device actually has unacceptable performance or operation. This condition jeopardizes data stored on the DASD.

The subject procedure, a compatibility verification test, verifies that all the major components in the DASD are compatible and will function in a manner appropriate for the intended design. The compatibility verification test is executed as part of the internal diagnostics during the power on process. The routine that is part of the internal diagnostics interrogates each major component of the electronics assembly for a compatibility identifier. The identifiers are compared with the corresponding identifiers written on the media.

Since the electronics assembly may be compatible with more than one level of HDA, the compatibility identifier contained in each major element of the electro...