Identifying image files not in Lightroom

[tonto]

I did a search of my computer and found I had 1',675 files in Lightroom, but found 14,124 in Bridge, a difference of 3,449 images, although, I don't know which ones they are. Is there any easy way to identify which of my image files I have not yet imported to Lightroom?
Thanx.

 

[disposable12]

Isn't that a difference of 3'% or so? I would think that just randomly going across the images in Bridge then looking them up in Photoshop would very quickly yield a few images in one that aren't in the other. And that may be all you need, you may find a file folder or external hard drive or some location you haven't considered that is full of images?

 

[MarkNicholas]

In Library mode select your root folder (where all your photos are) and then right click "synchronise folder". It will do a little check and identify which files are not yet in Lightroom and give you the option to import them (you can choose which ones)