Some folk MOVE images/files to such things and the move fails and the images are lost. This is usually when folk learn why we ask them to COPY images and files so they can try again if the copy fails.
Your images are likely on your backup system. You do use Time Machine? Right?
Have mac snow leopard. Was transferring photos from i-photo to a memory stick. They are not on the stick, not in my trash and they do not appear in i-photo any longer. Does anyone know where they can be? Thanks for any help.