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YAFFS (Yet Another Flash File System) was designed and written by Charles Manning, of Whitecliffs, New Zealand, for the company Aleph One. YAFFS maintains a tree structure in RAM memory of the physical location of these chunks. — “YAFFS - Wikipedia, the free encyclopedia”, en.wikipedia.org
The new LogFS filesystem is aimed to replace JFFS2 for most uses, but focuses more on large devices (> 64 MB - 512 MB), see also UBIFS and YAFFS. FAT • exFAT (FAT64) • TFAT • FFS2 • JFFS • JFFS2 • LogFS • NVFS • YAFFS. — “JFFS2 - Wikipedia, the free encyclopedia”, en.wikipedia.org
YAFFS – A Log structured file system designed for NAND flash, but also used with NOR flash.  Record-oriented file systems. In record-oriented file systems files are stored as a collection of records. They are typically associated with mainframe and minicomputer operating systems. — “List of file systems - Wikipedia, the free encyclopedia”, en.wikipedia.org