This post is referring to the MyPassport Protable Hard Drive.
BEFORE REDING THIS, please keep in mind that I am no expert and that this is based on personal observation and speculation based on my own expirements using this product and five different computers as well as my understanding of company explantions from WD and Microsoft. I may be wrong, and if I am, please send an E-mail my way via [text deleted for privacy] explaining my error. If I am right or this works for you, please feel free to send me an E-mail so that I may know.
I have had the same problem. However, are you all running Windows 7? If so, your upgrade has been WD's loss. With the way the external hard drives work, from my understanding, does not allow it to be compatable with Window 7s new and more effecient file format. These hard drives do some come with a driver of thier own as a design descision, which was fine and dandy before Windows 7 popped up, as all PCs ran a similar default driver system. Now, with Windows 7s new driver and file format system (which is still able to sommunicate with all other pre-Windows 7 product I own that can with its own driver), WD's hard drives do not follow a format that Windows 7 can read.
Think of it as XP and older (as I am not sure about Vista's file system) using British Pounds. Well, the new Windows 7 uses Euros, but will still accept pounds. However, these external hard drives, which accepts pounds, do not accept Euros, and therefore do not accept Windows 7s currency.
Because of this, I am getting a new external hard drive that will speak to my two Windows 7 computers, but will keeps this has a back-up driver for my three XP-based computers. This product works well with XP in my expierence, but just doesn't have the capabilities to work well with Windows 7.
Like I said before, please keep in mind that I could be wrong and am no expert. Thank you for reading and I hope this helps you.