Urgent: Can't detect the brand new HDD

I just purchased a 2TB HDD. I noted that the HDD can't be detected in Mac OS x by connecting the fireware 400 HDD enclosure.

Then, I use a USB HDD enclosure and test it under Windows 7. The device manager found that HDD and when I press "populate" under device manager, the information of the HDD can be shown. However, I can't find the HDD in "My Computer"

Does any "high hand" can give advice. Do I need to exchange the HDD from the sellter

solved. Sorry, I think I have to FORMAT.

long time hasn't use internal HDD