I have a WD Passport external hard drive and for some reason when I click on it the folders come up but when I click to go into them, I can't see any of the photos or files inside! I've never had issues with it before except the cord is a little temperamental and ejects itself very easily. Do you think this is a problem with the drive itself or the cord? Is the cord easy enough to replace on its own? If yes, am I able to order one online or where can it be purchased? My laptop is a macbook air.