3TB My Book Essential Light is on Constantly

I attached this drive to a Windows 7 Professional machine that has Norton Security Suite running.  The light is constantly on, which I assume to mean the something is accessing the disk constantly, yet nothing seems to be running.  I looked at the Resource Monitor and selectively suspended various processes without changing anything.  Does anyone know what this might be?  Or how to find out?  Thanks very much for any help.


These are what the LED indicates.

LED Appearance                                                                           Power State/Activity
On steady                                                                                        Idle
Fast flashing, approximately 3 times per second                   Activity
Slow flashing, approximately every 2.5 seconds                    System standby


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Thanks so much for that quick reply.