High Quality Content by WIKIPEDIA articles! The Unsorted Block Image File System (UBIFS) is a successor to JFFS2, and competitor to LogFS, as a file system for use with raw flash memory media. Development began in earnest in 2007, with the first stable release made to Linux kernel 2.6.27 in October 2008. Note that UBIFS works on top of UBI devices, which are themselves on top of MTD devices. MTDs are not to be used directly. Two major differences on UBIFS (compared to JFFS2) are that UBIFS supports write caching, and UBIFS errs on the pessimistic side of free space calculation. UBIFS tends to perform better than JFFS2 for large NAND FLASH devices. UBIFS is the default filesystem of the Nokia N900 Smartphone.

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