Not Able to Eject Safetly on Windows 7

Have a My Passport 1 tb.  I want to ejct the external hard drive.  I make use I have all the windows and programs closed.  I go to the 'Remove Icon Safetly" on the lower right conner on Window 7.  I highlight the Drive location.  Then it indicates that it cannot be removed because the drive still operating in the background.  I recheck to make sure everythig is closed but still get the same message.  Meanwhile the light on the device is constantly blinking (on and off).

How I can remove the device safetly and stop the device from blinking?

Are you allowing enough time for it to finish writing to the drive ?