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• W2189269033 abstract "storage medium is called nonvolatile if it retains its information content even when it is not powered on. The widespread applicability of devices with good data retention properties have made nonvolatile memory an area of active academic and industry research. A significant problem encountered in this field is that for many nonvolatile memories the process of writing to the medium is inherently uncertain. This phenomenon fundamentally limits the amount of information that can be stored on the medium thus reducing its storage capacity. But often, such storage media are rewritable, that is, previously written content can be read and rewritten if necessary. This creates a powerful feedback path that allows for an improvement in its storage capacity. In this article we describe a novel information theoretic model for rewritable media that has been recently proposed by the authors [6]. For a simple yet important special case, we show that rewriting can increase the capacity logarithmically in the average number of rewrites. We emphasize the role that feedback can play in increasing storage capacity and briefly indicate how methods from estimation theory and dynamic programming could be used to design feedback strategies that can approach this improved storage capacity. RELEVANCE Typically, a nonvolatile memory stores digital information on an analog medium using some sort of analog representation; a schematic of such a device is shown in Figure 1. Besides the traditional analog to digital (A/D) and digital to analog (D/A) converters, some memory technologies include a module that reads the contents of the memory array and, if necessary, applies the appropriate programming signals to change them. This stage is currently designed using concepts mainly from the disciplines of circuits, systems, and materials science. We believe that the fields of signal processing and information theory can play a vital role in the design of optimal programming strategies since in many ways the process is similar to that of modulation in communication systems. A problem exhibited by analog memory technologies is that the outcome of a write operation can be uncertain, either due to incomplete knowledge of how the memory will react to a stimulus, or because even under identical conditions and stimuli a memory can end up in different states due to stochasticity. To mitigate this problem, some memory technologies implement a digital feed" @default.
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• W2189269033 date "2009-01-01" @default.
• W2189269033 modified "2023-09-26" @default.
• W2189269033 title "The Role of Feedback in Rewritable Storage Channels" @default.
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