Photos disappeared

The photos (about 8 all togther ) were in jpeg format and I had viewed them until yesterday.  I had dragged and dropped them into the Fuze.  I  tried resizing the biggest one down to 43KB.  I tried using SMC to add just one photo,* but the file “failed to write”.  I tried dragging and dropping the resized picture and it “fails to copy.”

(I currently have an audiobook which is 216MB on the Fuze–could this be the problem?)

I hope this can be resolved–I found the Fuze a convenient way to show off grandchildren pictures.

Again, thanks for helping.