Supplemental memory having media directory

Details Supplemental memory having media directory Supplemental memory having media directory

2004-01-14

2009-02-17

Neyzari, Ali (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C359S022000, C359S011000, C359S003000

Reexamination Certificate

active

07492691

ABSTRACT:
Disclosed is a holographic data storage device including holographic media for containing data, writing data to and reading data from. The storage device also includes at least one supplemental memory for containing at least a portion of a directory of the data contained in the holographic media. By locating directory information for the holographic media in a supplemental memory, areas of the holographic media that have not yet been written to can be determined prior to accessing the holographic media. In this way, activating photo-sensitive agents in unwritten areas of the holographic media can be avoided unless these areas are being written to.

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