External Hard Drive Broken (?)- need help fixing or recovery

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I basically have the same problem as the person in this post:

My Passport: Corrupt Files. Can They be Recovered?

I bought my daughter a WD My Passsport (500GB) this past Christmas. She downloaded approximately 465 GB of pictures and music onto it for backup storage because she had to format her laptop. This past week she plugged the USB drive in to access it, the WD Unlocker asked for her password, which she provided and it unlocked. But in My Computer the icon shows up as "CD Drive (E:) WD Unlocker (22.7MB). When I open it, it only shows those files associated with the Unlocker program…  Extras, WD Smartw…

Usually when a hard drive breaks for me it just doesnt load. What does this CD drive mean and why is it 465 GB?