Disc not shown under Devices in Finder, but shows up elsewhere.

Hi,
A
drive is not showing up under Devices, but it is showing up in Disc Utility and in System Preferences>Startup Disc.
Here's the story:
My start up disc was full, so I moved my OS and everything except my really big files (i.e., photo, video and music folders) off my 1 TB HD to a 240 GB SSD.
Everything went great, except that now my computer doesn't recognize the source drive (the 1 TB drive). It doesn't show up anywhere in the Finder window. However, when I launch DiscUtility, it is there and it is mounted. I tried unmounting and remounting it, but still, it doesn't show up on that left column in Finder.
I CAN see my 2 TB backup drive under Devices though.
I can also see the 1 TB drive (aformentioned startup disc) inside MS Word when I browse the hard drive for a file.
I have a 2010 mac pro running OS 10.7.5.
Can anyone tell me what I need to do to get my computer to recognize this drive? Thank you in advance!

I would suggest trying a third-party disk repair utility such as Disk Warrior. If it can't repair the drive, you may be able to get the data off the drive with a recovery utility such as Data Rescue (Prosoft Engineering) or File Salvage.
Good luck.

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