The emergence of the USB standard in computer technology in the nineties can be compared with a quiet revolution: finally, the developers of the hardware and software part “remembered” ordinary users of personal computers, realizing the long-awaited possibility of “hot” connection of devices.
For many years, serving faithfully, parallel (LPT), serial (COM), and even PS / 2 interfaces did not allow for high-speed connection with a connected device, did not support self-tuning technology, peripherals were connected only with the power off. The USB standard (serial bus) that came to replace them eliminated all of these shortcomings. However, as it sometimes happens, shortly after the appearance of a large number of relevant devices, users began to appear on the Web for the error "USB device is not recognized." More than ten years have passed since the tire arrived, but the problem remains. Many still face the system message “device not recognized”. Let's try to understand what is happening: we’ll point out the possible causes and methods for restoring performance.
All devices for the serial bus can be conditionally divided into wired, which use a wire (printers, scanners, cameras, telephones, external hard drives) and wireless (flash drives) to connect to the port connector. The error "USB device is not recognized" is most often inherent in devices of the first type. This happens as follows: after connecting the wire and powering up, on Windows systems, an error message appears next to the clock. If at this time you view the status of the
device manager, then it appears there as an “unknown composite USB”. One common reason for this behavior is mechanical. Any break in the conductors in the wire or a violation of soldering in the plug - and the message "USB device is not recognized" will not take long. A very common problem. Moreover, we draw your attention to the fact that the wire may fail "on its own." For example, a printer that worked yesterday, which no one touched, is no longer working today, and the system says “USB device not recognized”. Reconnect the plug to another bus connector and, if that does not help, replace the wire. Sometimes the contact clamp in the connector is partially violated - the result is similar (which is why we recommend switching to another port). But this case is characteristic of an already working device. Everything is a little more complicated if you are connecting for the first time.
USB flash drives that do not use a wire are also not immune to this error. In this case, check the operation with the other connector. In some cases, the cause of the problem is trivial - a driver missing from the system. The solution is simple - install the device support program (phone, camera, etc.).
All modern motherboards support USB 2.0 standard. In BIOS, however, you can make adjustments to the settings of the controller by selecting support for versions 2.0 and 1.0 (1.1), or only the second version. Obviously, when “USB 2.0 Only” is activated, the device of the previous standard will not work normally. We read the instructions and check the appropriate settings.
By the way, in flash drives, an error message when connecting can be caused by a controller firmware failure. Often corrected by reprogramming.
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