 a file system designed for flash memory  a file system designed for flash memory admin 16 june 2012 1111pm famicrochip yaffs was designed from the ground up for flash memory it is best with nand flash but can be used with nor too it has mechanisms for wearlevelling and special attention has been paid to the safety of the system even under powerfailure it is works well with mlc nand as well as slc it is compatible with a wide range of flash including toshiba sandisk mlc parts see also the document considerations in using a flash file system for a discussion of the importance of reliability  