I had the 1Tb drive working with Vista. I upgraded to Windows 7. I am almost positive that it was there for awhile but now...
nothing I have tried will bring it back.
I have:
1) unplugged the firewire and powered the drive down. Shut down the pc and reconnected the drive and fresh boot.
2) It was daisy chained off of another drive. So I removed the other drive and had it directly plugged into the PC. fresh boot again.
3) I have removed the firewire it originally had and used one that was working perfect with the other drive I have.
The drive seems to be spinning up. It is only a few months old. Not sure what other tricks to try. I guess I could try to hook it up via USB just to see if it will show up.