I have plugged in an old hard drive today I have not used for a while to get some old photos from. There are thousands on the drive, but I notice in finder than many of them display as .jpg icons in finder and not with an image of the photo. To no surprise, they don't open either. I think it might have been a problem with the drive they came from, but do have copies so not concerned.
Is there any quick way of deleting these thousands of non-working images from my hard drive to clear out the debris so I am only left with working photos.