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3355 Michelson Drive, Suite 100, Irvine, California, United States - 92612
Based on your post, I'd suggest you to remove the drive from the USB hub and directly connect it to your computer because many hubs leave the data ports active indefinitely and that lead the drive to be on even when you shut down the PC.
I have found a relevant article which explains more about the similar issue. You may visit the link below and click on "The WD My Book external hard drive does not power down automatically when the computer system shuts down"
http://wdc.custhelp.com/app/answers/detail/a_id/3537
Hope it helps.