Observation Of Underlayer Domain Noise In Perpendicular Recording Discs

Darragh, N.; Mapps, D.J.; Donnelly, T.; Wade, G.; Hoinville, J. R.

doi:10.1109/intmag.1993.642628

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1997

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“…In such cases "buried" messages can be present in the analogue signal which are invisible to digital detection. One such example occurred [40] when a series of small noise spikes appeared in the digital data being retrieved from a perpendicular disk which had a high permeability magnetic underIayer. At first the noise spikes seemed to be random but as an experiment, their positions on the disk were logged by a laser-based mapping system and plotted out on a diskshaped map using a computer to place a dot where each noise spike occurred.…”

Section: Future Directionsmentioning

confidence: 99%

Signal Processing for Present and Future Magnetic Recording Systems

et al. 1997

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Abstract-A background of activity is presented for signal processing as applied to, and used in, magnetic information storage systems. Specific examples are given of how current and previous research projects fit into the overall progress of research in this area. Arguments are presented as to why, in the distant future, information will be stored as "analogue" information rather than binary so methods and techniques will need to be developed to utilize the near-infinite capacity of such systems.

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Section: Future Directionsmentioning

confidence: 99%