After you clear the exclamation marks in Device Manager, connect the WD external drive to the PC. Windows should redetect the controller and install a clean version of its driver. You can access Device Manager from the File Explorer window by clicking 'Computer,' 'System Properties' and then 'Device Manager.' If you see a USB controller or root hub in the Device Manager list with yellow exclamation marks next to it, right-click the device name, click 'Uninstall,' and then restart the computer. Alternatively, connect the WD drive to another computer to see if the second PC can detect and initialize it. With a new, stylish design that fits in the palm of your hand, there’s space to store, organize, and share all the photos. Compatible with USB-C and USB-A, the My Passport for Mac drive comes equipped to connect with today's latest technology. A way to tell if you have driver problems with one or more USB controllers is to check in Device Manager. The My Passport for Mac drive is trusted, portable storage that perfectly complements your on-the-go lifestyle. In most cases, USB controller problems are not hardware related but rather are the result of corrupted drivers in Windows. Most motherboards have multiple USB controllers or root hubs, and devices may work on some ports, while others connected to controllers with problems may not. Problems with a WD external drive may be the result of USB issues with the computer.