Unsorted Block Images
Unsorted block images (UBI) is an erase block management layer for flash memory devices. UBI serves two purposes, tracking NAND flash bad blocks and providing wear leveling. Wear leveling spreads the erases and writes across the entire flash device. UBI presents logical erase blocks to higher layers and maps these to physical flash erase blocks. UBI was written specifically for UBIFS so that it does not have to deal with wear leveling and bad blocks. However, UBI may also be useful with cramfs and NAND flash; cramfs is not aware of NAND flash bad blocks.
Read more about this topic: UBIFS
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