Burying its head in the NAND: Samsung boosts 64-layer 3D flash chip production • The Register: "Samsung says that its 256Gbit chip has about 85.3 billion cells and several billion holes penetrating "several dozen layers of cell-arrays", with technological difficulties including making these holes homogeneous in shape. Another was “properly dispersing the weight of all the layers to improve the stability of the channel holes.”"

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