I have a 500GB Seagate usb 2.0 External Mass Storage Device (Plug and Play) with my important data on it, and I have been using it without any problem for several months. Now when I plug it in, the auto-play function starts for few seconds but no files appears, the drive comes up in my computer as drive “E” as it usually does, but then when I click on it, it says my external hard drive is not formatted and asks me if I want to format it. I assume reformat it would erase all of the data I have on it so I didn't do it but when I click "no" I can't access the drive. The drive properties show 0kb for free space and 0kb for used space. What happened to the around 70 GB of files I stored on the drive? Is there another way to access the data on the drive?