This issue can be caused if any of the following situations exist: USB Device not recognized: One of the devices attached to this computer has malfunctioned and windows does not recognize it.Īpplies to: Windows 10, version 1709, Windows 7 Service Pack 1 Original KB number: 2654149 Cause When you try to access data on an external USB hard drive, you may receive the following error: This article provides methods to solve the USB Device not recognized error that occurs when you try to access a USB external hard drive. 'USB Device not recognized' error when you try to access a USB external hard drive