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What is the difference between main area and spare area in a NAND device?

April 26, 2017area device main NAND spare

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What is the difference between main area and spare area in a NAND device?

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For a 2-Gbit NAND device, it is organized as 2048 blocks, with 64 pages per block. Each page has 2112 bytes total, comprised of a 2048-byte data area and a 64-byte spare area. Spare area is reserved for bad block mark and ECC values.