Find not finding on main drive

I have 2 back up drives connected to my computer: one internal, the other an external firewire.
I tried to find a folder and pressed: CMD + F and put in the the folder name in the upper right field where the cursor lands as default and it found 2 occurances:
one on my internal backup and the other on my external, but not the original folder on my main drive that I am was currently running off of at the time.
"This Mac" was selected, so I assume it should look on all drives connected to my computer, but for some reason isn't finding on my the main drive.
There was one criteria set: Kind = Folders
To be sure I added a 2nd criteria: Name
which was a duplication, I realize, but I wanted to be sure.
Am I doing something wrong? Shouldn't a find, find on the main computer drive?
Mac Pro. Running OSX 10.5.7
Thanks,
Steven

OH... I see the problem. I put my main drive in the privacy window to stop it from indexing because I was trying to find a cause that my system was crashing and SL was a suspect at the time. I just need to delete my drive from the Privacy window and all should be OK. Thanks.

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