Courtesy of Custom PC Review At Flash Memory Summit, Toshiba was showcasing their latest 15nm 128Gbit MLC NAND wafer that has been developed in partnership with SanDisk. I simply could not resist to calculate the die size as Toshiba/SanDisk has not published it and die size is always the basis of any semiconductor cost analysis. Unfortunately I was too busy running between meetings that I did not take a photo of the wafer, so I am borrowing the picture from Custom PC Review. To estimate the die size, I used the same method as with Samsung's second generation V-NAND. Basically I just calculated the amount of dies in both X and Y axes of the wafer as that gives as an approximation of the die size...

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