The documentation doesn't define anything but R, W, and S (and barriers). I'm guessing F is a FUA/flush, but why two F's? Is M no-merge? Out of this list of RBWS's: WS FWS FWFSM ... will any cause NAND/flash to thrash (i.e. shorten the life by constantly clearing/garbage collecting large "blocks" for small writes)? Thanks, Chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrace" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html