I was using a Macbook pro laptop since many years and recently have switched to Acer Aspire. This new laptop has Windows 7 operating system. I don’t have any problems with the operating system. I also have a WD Passport Essential (USB 3.0) and have some very important files in it which I want to transfer into my new Laptop. But my hard drive is not recognized by the windows 7 operating system. I am unable to use my WD Passport with the Windows operating system. It was working fine on Mac system.