Unknown Device in Device Manager
An Unknown Device is hardware Windows detected but can't name - because no driver is installed. The device itself tells you what it is through its Hardware ID; decoding that ID is the whole solution.
Why this happens
- No driver installed for the device (fresh Windows install, new hardware).
- The driver was removed or corrupted.
- Exotic or older hardware Windows Update doesn't cover.
Quick checks first
1Read the Hardware ID
Device Manager → right-click Unknown device → Properties → Details tab → Hardware Ids. You'll see something like PCI\VEN_8086&DEV_A370 or USB\VID_1A86&PID_7523. VEN/VID identifies the chip maker, DEV/PID the device model.
2Check when it appeared
If the unknown device appeared after plugging something in, unplug it and see if the entry disappears - that identifies which physical device it is.
3Several unknown devices after reinstalling Windows?
Start with the chipset driver (Intel or AMD) for your board or laptop. It names the motherboard's internal devices, and a few unknown entries usually disappear in one go - before you chase the rest individually.
The Hardware ID you just found is the key: the next step is to decode it into a real device and install its driver through the database.
Drivers most often behind this problem
Fixing it manually
Identify and install by Hardware ID
- Copy the first Hardware Ids value from Device Manager.
- Paste it into our Hardware ID search - the decoder shows the vendor, the device name and every driver version that supports it.
- Pick the driver matching your Windows version and architecture (64-bit for almost all modern PCs), create a restore point and install it following the page instructions.
- In Device Manager: Action → Scan for hardware changes. The unknown device should get its real name.
Know the exact device model?
Paste the Hardware ID into the database search - the decoder shows the vendor, the device name and every driver release that supports it, per Windows version.
This whole problem IS identification. The Hardware ID is the answer: PCI\VEN_10EC&DEV_8168 decodes to a Realtek network controller, USB\VID_1A86&PID_7523 to a CH340 USB-serial chip, and so on. Our search decodes these IDs automatically.
Try for example: PCI\VEN_10EC&DEV_8168 · read the Hardware ID guide
Frequently asked questions
▸Is it safe to just ignore an Unknown Device?
Sometimes - if everything you use works. But it often means some function is dead: a card reader, a sensor, Bluetooth, a chipset component. Identifying it by Hardware ID takes a minute and tells you what you're missing.
▸Can the unknown device be identified without copying Hardware IDs?
Copying the ID is the reliable way, and it takes two clicks: right-click the device → Properties → Details → Hardware Ids, then copy the top line. You never have to interpret the VEN/DEV codes yourself - paste the value into the search and it decodes to the real device automatically.
▸Device Manager shows “Unknown USB Device (Device Descriptor Request Failed)” - is that the same problem?
No - that error means the device failed to identify itself at all, so even its Hardware ID reads as unknown. It points at a cable, port or hardware fault rather than a missing driver; our “USB device not recognized” guide covers that case.