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External Hard Drive Interferes with Boot-Up

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?


2 Solutions
At a guess, does the external drive have any WD software included on it, in its root?

There could be something that is confusing the laptop's BIOS into thinking it's a bootable device.

If this is the case, there would be two options:

1. Examine the drive in Disk Management, and check if it has any hidden partitions. Delete them all, and make a new one, remembering to format. (You might want to make a copy of the WD software in case you want it back later).

2. Change the boot options in the laptop's BIOS to exclude any external devices.
philsimmonsAuthor Commented:

1.  There is definitely WD software on the drive, since it has built-in security encryption.  I don't think I should mess with that.

2.  Can you tell me how to adjust the boot options in the BIOS?
Try chaning the boot priority...make sure hard drive is set as the first boot device.

The WD software on the drive is the glitch.
To adjust the boot options in the BIOS see:
philsimmonsAuthor Commented:
Thank you!
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