Western Digital Hardware Encrypted, Work Around, Now only have 300GB??

So I have a My Book, external USB, 1TB. The case was broken, and I didn't know anything about it being hardware encrypted until I did a little research. So I got it into my system, and plugged into my SATA port, the BIOS sees it, and now I have Win 7 seeing it, I even was able to delete and reformat the existing volumes, the only thing is now I only have 300GB total? Any Ideas why and how to get around?

You may need to make all the partitions active and turn them into the same partition. You can do this in device manager.

umm... I guess I'm not sure how to do that, there's nothing there that I saw that was helpful. I used Disk Management to I think do that earlier, but it didn't show all of the HD in that.. the volumes that it saw only came to 300GB.

Why don't you go into the system repair on start up and see if you can make the hidden partition active and then format it. You wont damage your installation providing you don't actually format the hdd that has the OS installed on.