Drive stopped showing up in Windows 7

I have a 1 Terabyte Seagate drive (D: ) which is just used for storage of installed games, music, torrents, music vids and installers / applications. I have a 320gb Seagate drive that is split, 100gb for OS installation *windows 7* and the remainder for more storage.

Yesterday, I got home and booted up the pc, both drives show in BIOS and startup, however I can't access the terabyte drive in "my computer" now. I looked in device manager and the drive is there, although I can't populate it, it brings the message "volume information for this disk cannot be found."

I looked in Computer management and under disk management, I used to be able to view the drive, however now all I see is

Disk 0
Dynamic
Import Failed.

I ran HDD tune and access and write times to the drive are still normal, I'm just stumped as to why I can't access the drive. Any help would be greatly appreciated.

Win7 64bit OS
ST31000333AS - Affected drive