Need help on determining if my Western Digital 2TB hard drive is compatible with Windows 7 Ultimate 64 bit. I have a HTPC with 5.5TB in total. One of my drives is a WD 2TB GP drive which after completing a fresh install of Windows 7, I can no longer detect the drive. I've reinstall all MB drivers and even downloaded WD's Data Lifgaurd Tools (this solved the problem in XP for me before). Oh, and using Windows add hardware utility did not work either. Any help with this would be appreciated! Thank you!