Nighthawk X10 R9000 Does not recognize USB Harddisk

Thanks for all the responses. So far, the issue has been solved on my end.

Here was Netgear Support's response:

"With regard to your inquiry, we have test up to 4TB USB drive storage capacity. For larger than 4TB, you can partition your drive or use other USB drive that are tested to work with R9000. 

By the way, you may refer to this link for the list of USB drives have been reported to work with R9000, https://kb.netgear.com/18985/Will-my-USB-drive-work-with-ReadySHARE 

With your case, I suggest to partition your drive or use other USB drive. This is to isolate your case too. "

I however found my own solution. What I did was this exact sequence: 1) I turned off both the Nighthawk X10 router and the WD MyBook Hard Drive. 2) I tuned on the router after at least 15 seconds, and waited for it to fully reboot. 3) After the full reboot of the router, that is the only time I turned on the power for the WD MyBook Hard Drive.

The router now recognizes the 6TB WD My Book Hard Drive. It does not work in any other sequence than the one above. The router has to be turned on first and then with the USB connected first before powering up the Hard Drive.

I hope this helps all those with powered and high capacity hard drives above 4TB.