Win 7 does not recognize 2 TB in external enclosure?

[alex5908]

I connected my external 2 disc enclosure (NexStar MX) with 2 TB and 1.5 TB HDDs.
Windows XP recognizes the enclosure perfectly. Windows 7, 64 bit Manage shows "Invalid Discs". What shall I do? I am shocked and frustrated. Do I have to format the discs?! They are almost full. Did anybody come across with this issue? What is the solution? I tried NexStar in another PC with Win XP - both HDDs are recognized.
Please help.

 

[TVeblen]

Would this help you?
How to fix “Invalid Disk” error in Windows 7 | Mike Norman's Blog

This would assume that the drives are tagged as Dynamic disks. You could also check this out in Disk Management on the XP machine.