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Dec 21, 2020 • Filed to: USB Recovery • Proven solutions

Why is my USB not recognized?

Downloads Download now for Windows - v4.0.3 Download now for Mac OS X - v2.1.1 Download now for Linux - v4.0.3 Download source code Github Many applications already have libCEC built in and you do not need to do anything, if you are running windows, you may need to install the device driver, this is included in the libCEC package. This Driver License Agreement ('Agreement') is a legal agreement between you ('You', either as an OEM, or other company, or as an End User) and Elo Touch Solutions, Inc. (hereinafter referred to as 'ELO'), for the proprietary software portion of ELO touchscreen(s) and controller(s) or touchmonitor(s), which includes the accompanying computer. Dear Community, I have a software program I bought years ago that uses a USB hardware key running on Windows Vista. The HASP driver version that came with.

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

• 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.

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

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.

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.

USB Solution

Recover USB Drive

Format USB Drive

Fix/Repair USB Drive

Know USB Drive

V-USB is a software-only implementation of a low-speed USB device for Atmel’s AVR® microcontrollers, making it possible to build USB hardware with almost any AVR® microcontroller, not requiring any additional chip.

Features

• Fully USB 1.1 compliant low-speed device, except handling of communication errors and electrical specifications.
• Example projects demonstrate device and host driver implementations on Linux, Mac OS X and Windows.
• Supports multiple endpoints: one control endpoint, two interrupt/bulk-in endpoints and up to 7 interrupt/bulk-out endpoints. (Note that the USB specification forbids bulk endpoints for low speed devices, but V-USB supports them to some degree.)
• Transfer sizes up to 254 bytes by default, more as configuration option.
• Comes with freely usable USB identifiers (Vendor-ID and Product-ID pairs).

• Runs on any AVR microcontroller with at least 2 kB of Flash memory, 128 bytes RAM and a clock rate of at least 12 MHz.
• No UART, timer, input capture unit or other special hardware is required (except one edge triggered interrupt).
• Can be clocked with 12 MHz, 15 MHz, 16 MHz 18 MHz or 20 MHz crystal or from a 12.8 MHz or 16.5 MHz internal RC oscillator.
• High level functionality is written in C and is well commented.
• Only about 1150 to 1400 bytes code size.
• You can choose the License: Open Source or commercial. Click here for details.

Hardware

This diagram shows a typical circuit for a bus powered device.

D1 and D2 are a low cost replacement for a low drop 3.3 V regulator chip, such as the LE33. Operating the AVR at higher voltages exceeds the common mode range of many USB chips. If you need to run the AVR at 5 V, add 3.6 V zener diodes at D+ and D- to limit the voltage.

For a prototyping board, please see metaboard.

Documentation Resources

• Download the V-USB package containing a short description and several simple code examples.
• V-USB's git repository is on github.com.
• V-USB Forum. Discuss ideas or get help from other users.
• V-USB Wiki is a public Wiki with lots of additional information.
• There is also an excellent step by step tutorial by Code and Life.
• Another third party tutorial can be found at workinprogress.ca.
• Objective Development's Developer Article: Implementing USB 1.1 in Firmware

Benefits over Alternative Solutions

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Why not choose a microcontroller with built-in USB hardware? There are several of these available (see http://janaxelson.com). Or combine the microcontroller of your choice with a USB chip?

Advantages over Microcontrollers with USB Hardware

• Standard AVR controllers are usually easier to obtain.
• Most of the controllers with USB support are only available in SMD, which is almost impossible to handle for hobbyists.
• V-USB comes with a free shared Vendor- / Product-ID pair.
• A good free ANSI-C compiler (GNU gcc) and a free development system for Windows (WinAVR) are available for AVR.
• AVR controllers are faster than most of the controllers with integrated USB and cost less.
• Stand-alone operation: Some of the USB controllers download their firmware from the host computer into RAM. They don’t work without connection to the host.
• AVR controllers have on-chip EEPROM.

Advantages over separate USB Peripheral

• No additional cost.
• No additional hardware complexity: simpler PCB, less failures.
• More freedom in the choice of USB descriptors.
• V-USB comes with a free shared Vendor- / Product-ID pair.
• Little hardware resources used: only two to three I/O pins.
• USB chips are often hard to obtain.

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Advantages over other Firmware-Only Implementations

A similar driver for the AVR series of microcontrollers is available from Igor Češko. Our USB driver has the following advantages over Igor’s driver:

• All customizable code written in ANSI-C and thus easier to maintain.
• Modular concept: easier to integrate into existing designs.
• Slightly smaller code size in spite of high level language modules.
• Faster: All encoding/decoding (USB requires NRZI coding and bit stuffing) is done in real-time, not in the main loop after storing away the raw data stream.
• More endpoints, USB descriptors can be better customized.
• V-USB comes with a free shared Vendor- / Product-ID pair.
• The level of standards conformance is documented (description of limitations and potential problems).
• Licensed under the terms of the GNU General Public License or alternatively under a commercial license.

Dick Streefland has stripped down an older version of V-USB to the basics. His code is easier to read and understand, but lacks some of the features found in V-USB:

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• V-USB supports up to 4 endpoints. This allows implementing devices conforming to the HID or CDC device class.
• V-USB passes the tests in usb.org’s test utility.
• V-USB supports many different clock rates, some even with the internal RC oscillator.