Dynamic refresh for optical data storage

Details Dynamic refresh for optical data storage Dynamic refresh for optical data storage

1998-09-29

2000-04-04

Spyrou, Cassandra

Optical: systems and elements

Holographic system or element

Having particular recording medium

359 4, 359 25, 359 12, 430 1, 430 2, G03H 102, G03H 130, G03H 120, G03H 104

Patent

active

060468300

ABSTRACT:
A method for dynamically refreshing a holographic data storage medium wherein data is stored in a plurality of data pages, each of which comprises a two dimensional pattern of pixel data. Each data page is stored by interfacing an image or a Fourier transform of the data page with a reference beam to form a holographic recording of the data page in the holographic medium. Pursuant to the method, all of the data pages are classified as either good pages, each of which was written into storage less than a threshold time ago related to the decay of the holographic recording, or empty pages available for writing, or self-erasing pages which are self-erasing with time. At sequential time intervals, the oldest good page is read which then becomes a self-erasing page, and its data is rewritten into an empty page which then becomes the youngest good page, and the oldest self-erasing page becomes an empty page.

REFERENCES:
patent: 5422873 (1995-06-01), Kewitsch et al.
patent: 5877873 (1999-03-01), Bashaw et al.
patent: 5920409 (1999-07-01), Chadi et al.
P.J. van Heerden, "Theory of Optical Information Storage in Solids", Applied Optics, vol. 2, No. 4, Apr. 1963, pp. 393-400.

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