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The world's most expensive hard drive, designed by nuclear waste management agency ANDRA in France, is made of industrial-quality sapphire.
The sapphire hard drive, comprised of two 20cm-wide thin fused discs, is estimated to last one million years -- so don't worry about losing your data. The disc is engraved with platinum and is able to store up to 40,000 miniaturized pages.
The prototype costs $30,000.