How do I rebuild catalogue or recover data from an external hard drive?

I have a 2 Tb western digital hard drive that I keep  my photos on.
I seem to have corrupted the catalogue file. My OS 10.7.5 shows the disk as empty,
Apple's Disk utility tells me that the disk is ok.
So my question is how do i rebuild the catalogue, or recover the files?
I have been using an Iomega 1 TB external disk as a photo back-up, but I see that
my system has not backed-up to that disk for about 6 months.
Any suggestions as to rebuilding the catalogue file or recovering the data would be greatly appreciated.
Thanks,
RickR50

See Here...
iPhoto: How to move the Library to an EHD
iTunes: How to move the library to an EHD

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