This is exactly what happened to me when I tried, then I used a level 3 spin down command instead: F3 T>/3 F3 3>Z with F3 T>/3 F3 3>Z again LED 000000CE FAdr00280569 LED 000000CE FAdr00280569 something else to try? Did you try the level 3 command with the PCB alone or still mounted on the drive? All I can tell you is, I tried that with the PCB mouted on the drive and it worked for me. There might be other level spin down commands, you can look in the earlier posts of this thread for a complete list of all the commands.