Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636713
Title: Investigation into magnetic storage devices using the finite element technique
Author: Yong, S. H.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1995
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Abstract:
This project is concerned with the development of a unique product for erasing the data stored on Personal Computer hard disk drives. The objective is to prevent confidential data from leaking out to unauthorised people. The main focus point of the project is to explore a cost effective and reliable method for deleting data stored on both operational and non-operational hard disk drives and at the same time to provide a means for recycling old and defective hard disk drives. A demagnetisation method known as Demagnetisation by Field Reversal has been proposed as the solution. The method has been implemented using a micro-controller (INTEL 80C196KC) in conjunction with a MOS-FET inverter bridge. Finite Element method has been employed in the project (i) to analyse the behaviour between applied electromagnetic fields and the recording material and other magnetic materials (ii) to analyse the flux distribution around a hard disk drive and (iii) to aid the development of the demagnetisation system. As a result, two Finite Element programs, one for non-linear magnetostatic problems and the other for time varying problems, have been developed for Personal Computers using the C language. In addition, a method which uses the backup storage as an integral part of the core memory for Finite Element programs using banded solver has been developed. This method enables the developed Finite Element programs to deal with large size problems on Personal Computers. A method for assessing the performance or the results of the data deletion process has been proposed and developed in the project. The proposed method is similar to the method used in some commercial products for scanning hard disk drives but it gives more accurate information on the degree of success of the data deletion process of which the commercial products are incapable.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.636713  DOI: Not available
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