I have no idea what just happened to 3 folders of pictures. I was importing photos from my external hard drive to my lightroom catalogue and the photos just disappeared from hard drive. I have done searches on both my computer and external drive to find the files but can not locate them. Where are they?!!
How were you importing? Using Add, Copy, Copy As DNG or Move?
If you used Add, LR only lists the file location and reads it in order to make itself a preview. It is fairly unlikely that this would make the files disappear.
What OS? Have the folders disappeared also, or only the photo files?
I was adding them, not moving them. Just before the import completed the photos went from 900 to zero. When I went back to my external drive to start the import again, the entire file was missing-folders and photo file. I have OSX Yosemite 10.10.3