Did your external hard drive fail?
Then try the following:
Unplug the failed external hard drive or the external storage device.
Delete the corrupted external hard drive from Device Manager.
Reboot the computer.
Reconnect the external hard drive to your computer.
Let windows search for and install the new storage device drivers.
If the external storage device is not found, then you can search for a known driver and repeat the steps described above. Many external hard drives use windows drivers and do not require any special software to connect to your computer.
If the driver still fails to load, then the external storage device is defective or the flash drive or memory card is faulty. If you get the “USB Device Not Recognized” Error Message, then the computer will not be able to access the USB External hard drive. This message typically confirms that the USB external hard drive has failed.