Thanks for the input. I wonder if it's something to do with the P420. One thing I note is that the product and revision number reported by smartctl for your drive is different than other drives in this thread. Yours reports the micron model while Brick's reports an IBM model.I am also got a couple IBM branded Micron SSD( MTFDJAK800MBS-2AN ) with 528/b sector. And reformatted it in HP DL360e with P420 wihout any issues: