The storage density record was destroyed by a joint group from Caltech and UCLA.  While you are not likely to see this for sale anytime soon, that circuit seems to be well ahead of Moore’s Law and proves we have a while to go before we hit any sort of limit to the complexity of circuits.

“The most dense computer memory circuit ever fabricated, capable of storing around 2,000 words in a unit the size of a white blood cell, was unveiled by scientists in California. The team of experts at the California Institute of Technology (Caltech) and the University of California, Los Angeles (UCLA) who developed the 160-kilobit memory cell say it has a bit density of 100 gigabits per square centimeter, a new record. The cell is capable of storing a file the size of the United States’ Declaration of Independence with room left over.”

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