NAND or NOR flash chips. Samsung just unveiled their first 512MB PRAM prototype PRAM chip, and plan to begin selling the memory in 2008. The chips cite spiffy tech specs like "vertical diodes" and "three-dimensional transistor structure" to keep size down, and the memory doesn't require old data to be erased before being written over. Supposedly the tech should be cheaper and smaller than NAND in the long-run -- which is considerable given the fact that Samsung also introduced a 32GB NAND chip today made with a 40nm process.
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