 a robust flash file system since 2002 a robust flash file system since 2002 admin 25 april 2017 141pm yaffs yet another flash file system is an opensource file system specifically designed to be fast robust and suitable for embedded use with nand and nor flash it is widely used with linux rtoss or no os at all in consumer devices and critical infrastructure it is available under gnu public license gpl or on commercial terms from aleph one  