Patent ID: 6046830
Filing Date: 2000-04-04
Classification: G11B

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 which is stored by interfacing an image or a Fourier transform of a data page with a reference beam to form a holographic recording of the data page in a holographic medium, comprising the steps of:a. classifying each of the plurality of data pages as either reconstructible good pages, each of which reconstructible good data pages was written into storage less than a threshold time ago related to decay of the holographic recording, or empty available for writing, or self-erasing pages;b. at sequential time intervals, reading the oldest reconstructible good page which then becomes a self-erasing page, and rewriting its data into an empty page which then becomes the youngest reconstructible good page, and the oldest self-erasing page becomes an empty page.