Perhaps try removing the media card from the BB and then connect the BB to your pc. That may force it to mount as a removable drive. You could then copy the pics to the pc, re-insert the media card into the BB, and transfer them from the pc to the BB's card.
Or, just bite the bullet and move 'em one at a time. From the time of your first post to now you could have moved them all, several times over.