I have just bought a Macbook air to go with my Imac 27, iphone 4s and ipad2. I use an external iomega 2TB hard drive to store my movies and photographs. When the iomega is connected to the iMac it is visible in finder and a yellow icon appears on the screen. With the Macbook air, the iomega is visible in finder but there is no icon on the screen/desktop. I have tried to find a way of showing it in preferences but to no avail. Can anyone help please?