A digital-data-preservation system featuring LED-light computer tomography

A fundamental study on a digital-data-preservation system featuring a LED-light computer tomography (CT) was successfully performed. With this system, 17 x 17 x 17-bit test data (recorded by femtosecond laser in a 5-mm-thick, flat synthetic fused silica sample) is extracted from 27 projections at different angles. The results of annealing tests at 973K (700 degrees C) and 1173K (900 degrees C) imply that the system has the potential for achieving archival lifetime of over one-hundred-thousand years at room temperature. The storage density could be as large as 16.6Mbytes/cm(3) if bit pitch is minimized to 10 mu m.