 a robust flash file system  a robust flash file system admin 28 february 2012 710pm fashield as part of our regular testing we run powerfail tests whether it s during a read or a write yaffs is designed to preserve your existing data during a device power failure and because yaffs is open source you can download the tests and run them yourself in the most severe conditions you expect the product to encounter see http wwwyaffsnet documents yaffsrobustnessandtesting  