I see where to turn it on and off... but nothin about changing the notification tone for SD card..
This doesn't work btw... if you uncheck the sd notification it still says "droid" at the start of boot... but it kills those two ringy dingy tones at the end of boot... that helps though ... I didn't like those either
that's because it is part of the boot up animation you will not be able to change that until we achieve root.