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And when I went to the Device Manager, I saw the USB 2.0 Hub driver showing as. According to the USB standards a port can supply up to 500 MA of current for USB 2 (900 MA for USB 3). That is only 2.5 watts. With an unpowered USB hub all attached devices must share this limited power. Many conventional hard drives can require that full power themselves. In Device Manager, under category “Universal Serial Bus controllers”, right-click on Generic USB Hub device and select Update Driver Software. Select Browse my computer for driver software. Select Let me pick from a list of device drivers on my computer. Check the box next to “Show compatible hardware” and select Generic USB Hub.
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This topic is intended for OEMs who want to build a Windows 10 system with USB Type-C connector and want to leverage OS features that allow for faster charging, power delivery, dual role, alternate modes, and error notifications through Billboard devices.
A traditional USB connection uses a cable with a USB A and USB B connector on each end. The USB A connector always plugs in to the host side and the USB B connector connects the function side, which is a device (phone) or peripheral (mouse, keyboard). By using those connectors, you can only connect a host to a function; never a host to another host or a function to another function. The host is the power source provider and the function consumes power from the host.
The traditional configuration limits some scenarios. For example, if a mobile device wants to connect to a peripheral, the device must act as the host and deliver power to the connected device.
The USB Type-C connector, introduced by the USB-IF, defined in the USB 3.1 specification, addresses those limitations. Windows 10 introduces native support for those features.
Feature summary
- Allows for faster charging up to 100W with Power Delivery over USB Type-C.
- Single connector for both USB Hosts and USB Devices.
- Can switch USB roles to support a USB host or device.
- Can switch power roles between sourcing and sinking power.
- Supports other protocols like DisplayPort and Thunderbolt over USB Type-C.
- Introduces USB Billboard device class to provide error notifications for Alternate Modes.
Official specifications
Hardware design
USB Type-C connector is reversible and symmetric.
The main component are: the USB Type-C connector and its port or PD controller that manages the CC pin logic for the connector. Such systems typically have a dual-role controller that can swap the USB role from host to function. It has Display-Out module that allows video signal to be transmitted over USB. Optionally it can support BC1.2 charger detection.
Consider recommendations for the design and development of USB components, including minimum hardware requirements, Windows Hardware Compatibility Program requirements, and other recommendations that build on those requirements.Hardware component guidelines USB
Choose a driver model
Use this flow chart to determine a solution for your USB Type-C system.
| If your system... | Recommended solution... |
|---|---|
| Does not implement PD state machines | Write a client driver to the UcmTcpciCx class extension. Write a USB Type-C port controller driver |
| Implements PD state machines in hardware or firmware and support USB Type-C Connector System Software Interface (UCSI) over ACPI | Load the Microsoft provided in-box drivers, UcmUcsiCx.sys and UcmUcsiAcpiClient.sys. See UCSI driver. |
| Implements PD state machines in hardware or firmware, but either does not support UCSI, or support UCSI but requires a transport other than ACPI | Write a client driver for the UcmCx class extension. Write a USB Type-C connector driver Write a USB Type-C Policy Manager client driver |
| Implements UCSI but requires a transport other than ACPI | Write a client driver to the UcmUcsiCx class extension. Use this sample template and modify it based on a transport that your hardware uses. Write a UCSI client driver |
Bring up drivers
USB Function driver bring-up is only required if you support USB Function mode. If you previously implemented a USB Function driver for a USB micro-B connector, describe the appropriate connectors as USB Type-C in the ACPI tables for the USB Function driver to continue working.
For more information, see instructions about writing a USB Function driver.
USB Role-Switch driver bring-up is only required for devices that have a Dual Role controller that assumes both Host and Function roles. To bring-up the USB Role-Switch driver, you need to modify the ACPI tables to enable the Microsoft in-box USB role-switch driver.
For more information, see the guidance for bringing up the USB Role Switch Driver.
A USB Connector Manager Driver is required for Windows to manage the USB Type-C ports on a system. The bring-up tasks for a USB Connector Manager driver depend on the driver that you choose for the USB Type-C ports: The Microsoft in-box UCSI (UcmUcsiCx.sys and UcmUcsiAcpiClient.sys) driver, a UcmCx client driver, or a UcmTcpciCx client driver. For more information, see the links in the preceding section that describe how to choose the right solution for your USB Type-C system.
Test
Perform various functional and stress tests on systems and devices that expose a USB Type-C connector.
Test USB Type-C systems with USB Type-C ConnEx - Run USB tests included in the Windows Hardware Lab Kit (HLK) for Windows 10.
Run USB function HLK tests with a C-to-A cable (search for Windows USB Device in the HLK
Certification/ComplianceAttend Power Delivery and USB Type-C compliance workshops hosted by the standards bodies.
See also
Dec 09, 2020 • Filed to: USB Recovery • Proven solutions
Why is my USB not recognized?
How do I fix USB Flash Drive not recognized?
You may confuse about the USB not showing up and got the error of 'USB Device Not Recognized' when you connect a USB drive to the Windows computer. Why and how to fix USB drive is not working in Windows? On this, you can learn what is the reason caused your USB drive not recognized, and learn how to access the drive and get your data back with Recoverit USB Data Recovery software.
Why Windows Won't Recognize USB Device
There can be many reasons why Windows did not detect your flash drive. When users face problems with USB drive not showing up, most people believe that their drive is dead. However, this is only the worst-case scenario.
There may be a problem with your computer hardware or with Windows itself which may cause a flash drive not detected an error. For instance, if your USB ports are dead, if there are partition issues on your external drive, if you have been using the wrong file system, or if there are driver issues in Windows, a USB drive won't show up.
- The unknown device, descriptor request failed, error code 43
- One of the devices attached to this computer has malfunctioned, and Windows does not recognize it. For assistance in solving this problem, click this message
- Drive did not load successfully
- The device you connected to this computer malfunctioned, and Windows does not recognize it
- USB device did not recognize Windows 10/7
- Unknown drive, port reset failed
How to Fix USB Flash Drive Not Working in Windows
To computer not recognizing USB error in Windows, you must first determine the cause of the problem. Here are some solutions you can try out:
The most first solution to fix the error, you can restart your PC and reconnect it to the PC. Second, you should plug the USB drive into another computer, if the error still happened again, the drive is broken and need to repair. Last, what if you connect many USB devices to the same computer, you should try to plug out other UBS devices and check, if the drive doesn’t work, you may follow the next solutions to fix windows not recognizing USB.
1. Check your USB Ports
If your USB ports are not functioning properly, Windows won’t detect your USB flash drive. To check your USB ports,
- Navigate to Start > Control Panel > Hardware and Sound > Device Manager > Universal Serial Bus
- Click on Uninstall
- Click on Scan for Hardware Changes
If Windows still doesn’t recognize your device after these steps, your USB ports are faulty.
2. Update your Device Drivers
If your device drivers are outdated, Windows computers won't recognize USB. To update the drivers manually as follow:
For Windows 7:
- Navigate to Start > Control Panel > Hardware and Sound > Device Manager > Universal Serial Bus
- Check to see if any device is listed as 'Unknown Device'
- If yes, right-click on the Unknown Device > Properties > Driver
- Click on Update Drivers
For Windows 10:
- Go to Settings, and click on Update & Security.
- By clicking on Windows Update and click the Check for updates button.
You can get more specific steps to update drives on Windows 10.
These steps will update your device drivers. If your error was caused due to outdated drivers, it would be fixed.
3. Change Power Management Settings
The power management settings in Windows 10 can also cause a flash drive not showing up the problem. To solve this issue,
- Navigate to Start > Control Panel > Hardware and Sound > Device Manager > Universal Serial Bus
- Double click on the first 'USB Root Hub' that you see
- Navigate to the Power Management tab
- Uncheck the option 'Allow this computer to turn off this device to save power.' Click on OK.
- Please repeat these steps above mentioned for each USB Root Hub device in your list of Universal Serial Bus controllers
This will solve the power management issue that may cause Windows not to recognize a flash drive.
4. Updating Windows System
To update the Windows system on Windows 7 would help the computer to recognize a USB device, follow these steps:
- Go to Control Panel > System and Security;
- Next, users need to make sure that the 'Check for updates' option is selected;

- The Windows system will be updated.
- Then, users need to restart the system and connect the flash drive to make sure that the issue is solved.
This will fix issues with your USB root hub, and hopefully, Windows will recognize your flash drive.
5. Format your USB Drive
If you’ve tried all the above and nothing works, then your USB drive may be faulty. You’ll need to format the USB drive to get it to work again. To format USB drive,
- Navigate to the Windows Disk Management tool
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- Right-click on your USB device on the list of all disks and click on the format
Important: Formatting will erase all data from your USB drive. Make sure to restore and backup your data before you try formatting your USB device. If you can't access your USB drive data and backup data files, you still can restore your data as the following solution:
Video Tutorial on How to Fix USB Device Not Recognized
Recover Data after Fixing a USB Flash Drive Not Working Error
After fixing the USB device malfunctioned and not recognized the error in Windows, if the above-mentioned solution can help you and work, you can get a USB drive data recovery program to help you access the drive and get your data back.
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Recoverit Data Recovery can help you recover data from a USB flash drive, even the device got corrupted or damaged, or formatted. The software can access the drive and recover data back.
Steps on How to Recover Data from Not Working USB Drive
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Step 1. Launch Recoverit USB Flash Drive Recovery program, select the USB drive which detected on the software to get started.
Step 2. The USB recovery software will start scanning the device, it will take a while to search the lost data.
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Step 3. In the end, you can check all recovered data and files. Preview recovered photos, videos, audios, Word, Excel, PPT, and PDF files. Select your USB files and click the 'Recover' button save them to a safety device path.
There are many reasons why Windows may fail to recognize a USB device. It can be because of problems with computer hardware, with Windows, or with the flash drive itself. Make sure to determine the cause of the USB not recognized issue before you format your drive.
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USB Solution
- Recover USB Drive
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