Can't read second HDD

I just installed a SSD(via a enclosure which replaces the optical drive) into my 2009 iMac in addition to the 3TB drive I already have. I've install 10.8 onto the new SSD and am using it as my boot drive.  I want to now use my existing 3TB drive(which I have not formatted and still has OSX loaded on it) as a storage drive, however, I cannot see the drive in Finder when running off my SSD but I can see it if I run Disk Utility.  If I boot off my old 3TB drive I can see the new SSD in Finder without a issue.
Any ideas what's stopping Finder from seeing the existing 3TB drive when booting from the SSD?
Thanks in advance.

Are you runnig from a new install of OS X? Where are you looking for it, are you only looking on the Desktop?
Open /Volumes by entering it into the Finder 'Go menu > Go to Folder…' dialog.
Can you see it there? Also look in the 'Computer' item in that menu.
Disks are hidden on the Desktop by default, so perhaps it is just a preference that needs tweaking. 'Finder Preferences > General' should allow you to enable the showing of disks.
Disk Utility also has a blue link for mounted volumes, select the volume in the list & see if the link exists at the bottom of the window, that should open the disk too.

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