I bought the WD My Book a while back and used it for my Mac. I was never able to use it for my PC for whatever reason, even though it is for both. Yesterday I hooked it up to my Mac to upload some pictures to the Walmart site to make a photo album. When I checked a while later, the Mach showed a sign it needed to be shut off. I shut if off and now I have a folder with a question mark, which eman the Mac can't find the start up. I tired my My Book and it doesn't work either. It has light and makes a humming sound, but it looks like all the data is gone. How can it both be erase by just a simple upload to a webpage? I don.t have a start up disc.....the Mac is 12 years old but I need the data on the My Book....Help please.