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Description
Recently, a large number of hard disc drives have been decommissioned due to wear and their replacement with more efficient and reliable solid-state drives. However, before the decommissioning, the data stored on the HDD should be erased. This process is typically carried out through degaussing. However, the aluminium-steel casing of HDDs significantly attenuates magnetic flux density. Additionally, HDD construction varies in terms of steel cover thickness, aluminium chassis, and the number of platters, all of which can impact degaussing performance. To understand this attenuation, the magneto-dynamic process must be modelled using methods such as the finite element method (FEM).
However, the optimal modelling parameters for accurately simulating the attenuation effect remain unclear. The paper presents the results of the analysis of the influence of mesh granularity on the accuracy of modelling the magnetic flux density attenuation [2] of the typical aluminium-steel cases presented in Figure 1. Finally, the paper establishes modelling guidelines to optimise the demagnetisation process and enhance its efficiency.
Acknowledgements
The research was carried out within EUREKA project no EUREKA/AI-REC/13/2022 project co-financed by the National Centre for Research and Development (NCBR) in years 2024-2025.
References
[1] J. Maierhofer and D. J. Rixen, “Computing Forces by ECSW-Hyperreduction in Nonlinear Magnetodynamic FEM Problems,” IEEE Transactions on Magnetics, vol. 60, no. 1. Institute of Electrical and Electronics Engineers (IEEE), pp. 1–13, Jan. 2024. https://doi.org/10.1109/tmag.2023.3332210
[2] D. Kopala, “Improved accuracy of FEM fluxgate models based on adaptive meshing,” PRZEGLĄD ELEKTROTECHNICZNY, vol. 1, no. 10. Wydawnictwo SIGMA-NOT, sp. z.o.o., pp. 145–148, Oct. 03, 2024. https://doi.org/10.15199/48.2024.10.27
