This appears to be a Lightroom problem, so I thought I would start this question on this forum.
I have just added a Western Digital 3 TB external hard drive, Firewire 800 and USB2. I have it daisy chained to an older WD Firewire 400 (using a 800 to 400 cord) which is connected to an iMac 2.93 Core 2 Duo. Lightroom 4.3 does not display the 3TB in the Library folders. The 3TB is recognized by the computer and all other software; Photoshop, utilities, Time Machine, etc.
Any thoughts are appreciated.