in a nand flash, what's bank meaning?

In a NAND flash memory, a bank refers to a logical partition of the physical memory array. A bank is typically composed of several pages and blocks, and each bank can be accessed and programmed independently. The number of banks in a NAND flash memory varies based on the size and architecture of the memory device. Having multiple banks allows for more efficient utilization of the memory and enables faster read and write operations.

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in a nand flash, what's blank meaning?

In NAND flash memory, "blank" refers to a memory cell that has been erased and contains all 1s (binary value). This is the initial state of a NAND flash memory cell before data is programmed into it. When data is programmed into the cell, the 1s are changed to 0s, which can be read by the device accessing the memory.