My computer recently crashed but I was able to save my WD Protege WD400 hard drive. The hard drive has been put into a NX2 Nexxtech external box with a usb cable but the new computer will not open it. Clicking on the drive in my computer gets me the following error: request could not be performed because of a i/o device error. How do I open this drive without erasing everything on it? I am totally confused since I was told accessing this drive would not be a problem -- just plug it in! Please help.