I am running Windows 7 on a Lenovo laptop with USB 3.0 capabilities. Yesterday I purchased a Western Digital Passport 2TB external hard drive. The drive works fine, but when it is plugged in on boot-up the computer hangs at the Lenovo splash screen. If I plug the hard drive in after Windows loads (e.g. at my user login screen), everything works fine. I tried going into MSCONFIG and disabling the automatic unlock feature of the drive, but it didn't change anything. All of my other USB 2.0 and 3.0 devices (including 2 other external drives) work fine without any boot-up difficulty. Any idea what could be causing this?