Data Saved In Quartz Glass Might Last 300 Million Years

From Scientific American:

Most cultural institutions and research laboratories still rely on magnetic tape to archive their collections. Hitachi recently announced that it has developed a medium that can outlast not only this old-school format but also CDs, DVDs, hard drives and MP3s. The electronics giant partnered with Kyoto University's Kiyotaka Miura to develop "semiperpetual" slivers of quartz glass that Hitachi says can preserve information for hundreds of millions of years with virtually no degradation. The prototype is made of a square of quartz two centimeters wide and two millimeters thick. It houses four layers of dots that are created with a femtosecond laser, which produces extremely short pulses of light. The dots represent information in binary form, a standard that should be comprehensible even in the distant future and can be read with a basic optical microscope. Because the layers are embedded, surface erosion would not affect them.

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