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When the Idle time is up and the device has been disconnected, you get
another notification:
NOTE: This function might not work with Storage device such as
pen driver/flash driver. These devices tend to periodically (on a
millisecond base) communicate with the OS even when the user is
not reading data from it or writing data to it. So it never actually
stays “Idle” and will never be automatically disconnected by this
function. External USB HDD type storage device does not have this
problem.