Hello! Usually we can format a USB with "mkfs" command. this command can use to format a USB as ext2, ext3 , ... . I think there is something similar for YAFFS like 'mkfs.yaffs2'. My guess is true and there is such a file but this executable file only convert a directory to image! I can not understand why it is useful for formatt a USB!? Is it possible to format a USB as YAFFS2 with that file? If not, What is the way to do that? as I mentioned before, I searched a lot even in the YAFFS website But nothing found. It is a good time to explain about it for me and anyone with the same problem. Thanks.