W520 hangs on boot when a WD SES USB drive is connected

Hi,
Computer: W520
Hard drive: Western Digital - My Passport (SES Drive - encrypted)
When I boot with the usb hard drive connected to any usb port on the computer, the computer hangs forever at boot time. If I unplug the drive and reboot, everything is fine. I was able to fix the problem by disabling the USB support in the bios but then, none of the USB ports work in Windows.
I believe this is due to the SES function of the WD usb hard drive (see: http://wdc.custhelp.com/app/answers/detail/a_id/3701/~/computer-freezes-when-it-restarts-with-a-wd-m...
Also, a previous post with a similar problem was written on this board but provided no working solution (see: http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W520-won-t-boot-with-SES-device-connected-to-U...
Thanks in advance for your help.

Hello jeantremblay44,
As I understand the laptop cannot boot if the external USB drive is connected.
Kindly try the following troubleshooting step
You can make the USB boot disable from BIOS and make the first boot device as Hard Disk
Best Regards,
Tanuj
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