The NAND type could contain more than double the amount of information and be slower if used like a floppy disk or hard drive.

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For decades, hard-disk makers have been shrinking the electromagnetic media that store data to cram more information into a tinier footprint.

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With 15 terabytes of hard disk storage, the Watson system at Rensselaer will store roughly the same amount of information as its Jeopardy!

ENGADGET: Watson heading to college, honing administrator-pranking algorithms

Fujitsu is eager to shed its loss-making hard-disk drive business, in order to focus on gaining ground against formidable rivals IBM and Hewlett-Packard in information technology services consulting.

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