The Unknown USB Device (Device Descriptor Request Failed) error usually means Windows cannot properly communicate with or identify a connected USB device. Fortunately, you have several ways to troubleshoot it before assuming the hardware has failed.
Start by restarting the computer, trying another USB port, and disconnecting unnecessary USB devices. If that does not work, remove the unknown device through Device Manager, update the USB controller drivers, and review USB power-saving settings.
You can then check for Windows updates, repair corrupted system files with SFC and DISM, and test the USB device on another computer. If the device continues to fail everywhere, inspect the cable and connector and consider the possibility of a physical hardware problem.
Let’s learn the causes and fixes in detail!
Fix Unknown USB Device Descriptor Request Failure Issue
To fix the Unknown USB Device Descriptor Request Failure Issue:
- Restart your computer and reconnect the USB device to check whether the error was temporary.
- Try another USB port and, if possible, connect the device directly to the computer instead of using a USB hub.
- Remove the Unknown USB Device entry from Device Manager and restart Windows so it can detect the device again.
- Update or reinstall USB drivers through Device Manager to resolve driver-related problems.
- Turn off USB power-saving options that may cause Windows to disconnect or incorrectly identify the device.
- Restart the USB-related services and hardware connection by shutting down the PC completely and reconnecting the device.
- Run Windows system file and image repair commands if corrupted system components are causing the USB descriptor failure.
- Check the USB device on another computer to determine whether the problem is caused by Windows or the physical device.
The following steps are arranged from simple fixes to more advanced solutions. For the best results, test the USB device after completing each step.
Step 1: Restart Your Computer
Start with the simplest solution. A temporary Windows or USB controller glitch can sometimes cause the descriptor request to fail.
Save your work, disconnect unnecessary USB devices, and restart your computer. After Windows loads again, connect the problematic USB device directly to the PC.
If the device works normally after the restart, the problem was likely caused by a temporary communication or driver issue. If you still see Unknown USB Device (Device Descriptor Request Failed), continue to the next step.
Step 2: Try a Different USB Port
A damaged or malfunctioning USB port can cause Windows to recognize that something has been connected without being able to communicate with it correctly.
Disconnect the device and connect it to another USB port. If you are using a desktop computer, try a port directly on the back of the PC because those ports are connected directly to the motherboard.
If your computer has both USB 2.0 and USB 3.x ports, try both types. You can usually identify USB 3.x ports by their markings or color, although the appearance can vary between computers.
If the device works in another port, the original USB port may be the source of the problem.
Step 3: Disconnect Other USB Devices
Sometimes multiple connected USB devices can create power or communication problems, particularly when several devices are connected through a hub.
Disconnect USB accessories that you do not currently need. This includes external drives, webcams, printers, controllers, USB hubs, and other accessories.
Leave only the problematic device connected and restart the computer. Then check whether Windows detects it correctly.
If it starts working, reconnect your other USB devices one at a time. This can help you identify whether another device or USB hub is contributing to the problem.
Step 4: Remove the Unknown USB Device From Device Manager
Windows may have an incorrect device entry stored in Device Manager. Removing that entry can force Windows to detect the USB device again.
Press Windows + X and select Device Manager. Expand Universal Serial Bus controllers. Look for an entry named Unknown USB Device (Device Descriptor Request Failed).
Right-click that entry and select Uninstall device. If Windows asks you to confirm, select Uninstall.
Once the entry has been removed, restart your computer. Windows will scan the hardware again during startup and attempt to identify the USB device.
After Windows finishes loading, reconnect the device if necessary and check whether the error has disappeared.
Step 5: Update the USB Controller Drivers
Outdated or corrupted drivers can interfere with communication between Windows and USB hardware.
Open Device Manager again by pressing Windows + X > Device Manager. Expand Universal Serial Bus controllers and look for entries such as USB Host Controller or USB Root Hub.
Right-click the relevant controller and select Update driver. Choose Search automatically for drivers and allow Windows to check for an available driver.
Repeat the process for other USB controller entries if necessary. Once finished, restart your computer and reconnect the USB device.
If Windows reports that the best driver is already installed, continue with the next troubleshooting method.
Step 6: Turn Off USB Power Saving
Windows can reduce power consumption by temporarily turning off certain USB devices. In some situations, these power-saving settings can interfere with USB communication.
Open Device Manager and expand Universal Serial Bus controllers. Right-click a USB Root Hub entry and choose Properties.
Open the Power Management tab. If you see the option Allow the computer to turn off this device to save power, clear the checkbox and select OK.
Repeat this process for other applicable USB Root Hub entries. Restart Windows afterward and test the problematic device.
This solution can be particularly useful if the USB device works temporarily and then disappears or stops responding.
Step 7: Perform a Complete Power Cycle
A normal restart does not always completely reset every hardware component. A full shutdown can help clear a temporary USB controller state.
Disconnect the problematic USB device and shut down your computer completely. If you are using a laptop, disconnect the charger after shutting it down.
Wait for about 30 seconds. Then turn the computer back on and allow Windows to load completely.
Connect the USB device again and check Device Manager. If Windows now identifies the device correctly, the problem may have been caused by a temporary hardware controller state.
Step 8: Check for Windows Updates
A Windows update can sometimes resolve compatibility problems involving USB controllers, chipsets, and hardware drivers.
Open Settings > Windows Update. Select Check for updates and allow Windows to download and install available updates.
Restart your computer if Windows requests it. After the restart, connect your USB device and check whether the descriptor error has been resolved.
If the problem began immediately after a recent update, however, the update itself could potentially be involved. In that situation, additional troubleshooting may be necessary rather than repeatedly installing updates.
Step 9: Repair Corrupted Windows System Files
If Windows system files related to hardware detection have become corrupted, repairing them may resolve the USB problem.
Open Command Prompt as administrator. You can do this by searching for Command Prompt, right-clicking it, and selecting Run as administrator.
Enter the following command:
sfc /scannow
Press Enter and wait for the scan to finish. Do not close the Command Prompt window while the scan is running.
If Windows reports that it found and repaired corrupted files, restart your computer and test the USB device again.
If the issue continues, you can also use the DISM tool to repair the Windows component store. In an administrator Command Prompt, enter:
DISM /Online /Cleanup-Image /RestoreHealth
Allow the process to complete. It can take some time, so avoid interrupting it. Once finished, restart the computer and test the USB device again.
Step 10: Test the USB Device on Another Computer
At this point, it is useful to determine whether the problem is with Windows or the physical USB device.
Connect the device to another computer. If it works normally on the second computer, the USB device itself is probably fine, and the problem is more likely related to your original computer’s drivers, USB controller, Windows configuration, or USB ports.
If the same descriptor error appears on multiple computers, the USB device, cable, or connector may be damaged.
For removable storage devices, avoid repeatedly reconnecting a device that appears physically damaged, especially if it contains important files.
Step 11: Check the USB Cable and Physical Connection
If the affected device uses a detachable USB cable, inspect the cable carefully. A damaged or loose cable can prevent Windows from receiving the information it needs from the device.
Try another compatible cable if you have one available. Make sure the connector fits securely into both the computer and the USB device.
Also inspect the USB connector for visible physical damage, bent contacts, dirt, or looseness. Do not force a connector into the port because that can cause additional hardware damage.
If replacing the cable solves the problem, the original cable was likely responsible for the failed connection.
Step 12: Consider a Hardware Problem
If none of the software troubleshooting methods work and the device fails on multiple computers, there may be a hardware failure.
The problem could involve the USB device’s connector, internal controller, cable, or electronics. A USB flash drive or external storage device can also fail unexpectedly.
If the device contains important data, avoid repeatedly attempting risky fixes. Consider using a professional data recovery service if the information is valuable.
If the device is under warranty, checking the manufacturer’s warranty or replacement process may be the better option.
Faqs
What does “Device Descriptor Request Failed” mean?
It means Windows could not successfully retrieve the identification information from a USB device. The problem can be caused by drivers, USB ports, power management, system problems, cables, or hardware failure.
Can a USB port cause this error?
Yes. A damaged, dirty, loose, or malfunctioning USB port can prevent proper communication between Windows and the connected device. Trying another USB port is one of the easiest troubleshooting steps.
Is the USB device permanently damaged?
Not necessarily. The error does not automatically mean the USB device has failed. Driver problems, temporary Windows glitches, power settings, and USB controller issues can produce the same message.
Should I uninstall the Unknown USB Device from Device Manager?
Yes. Removing the Unknown USB Device entry can allow Windows to detect the hardware again after a restart. This is a standard troubleshooting step and does not mean you are permanently deleting the physical USB device.
Why does my USB device work on another computer?
If the device works on another computer, the problem is likely specific to your original PC. USB drivers, Windows configuration, power management, USB controller software, or a damaged USB port could be responsible.
Can updating Windows fix the problem?
It can. Windows updates may include improvements or fixes for hardware compatibility and device drivers. Checking for available updates is worth trying when troubleshooting USB detection problems.
What if nothing fixes the USB descriptor error?
If the device fails on several computers and different USB ports, the issue may be hardware-related. Try a different compatible cable if applicable. If that does not help, consider professional repair, replacement, or data recovery depending on the device and the importance of its contents.