I don't understand this secrecy about X, Y, Z...what exactly is 15nm is always debatable (which dimension you measure and how) so we might as well say as it doesn't mean much anyways...perhaps they are trying to borrow a page from the Apple book, let's be mysterious
At the Q4 2012 earnings call, Sandisk CFO did in fact mention that they would get less cost improvement from 1Y nm (probably because it's from quadruple patterning) than from 19 nm in 2013, but they are still proceeding regardless.
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