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Why UBI does not use OOB area of NAND flashes?

area Flashes NAND oob UBI
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Why UBI does not use OOB area of NAND flashes?

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Because many flashes (e.g., NOR) do not have OOB and UBI was designed to be a generic wear-leveling layer. Also, modern MLC NAND flashes use whole OOB area for the ECC checksum, so there is no room for application data.

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