It is amazing to me that they could dedicate such resources to parity on these devices. I wonder at the sophistication of the parity scheme. For instance, if you look at many raid controllers, etc (same concept essentially as ssd with its controller and nand) running a parity raid set can really cripple write speed in many scenarios. And these full blown raid controllers are with chips that are immeasurably faster than the low wattage chips present on an SSD.