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    Technology Manager of Test Dept.

Sometimes, we may encounter “USB device not recognized” after connecting the USB splitter or portable disk to computer. However, they work normally if we connect to other computer. This essay will help you get rid of this problem.

Part 1: Possible Reasons

Sometimes we may receive the notification which says “USB device not recognized” after connecting external device to computer via USB ports.
usb ports are not working
Actually, this USB ports not working error could be caused by the following reasons:

  • 1. The loading USB driver is not stable even damaged.
  • 2. Incorrectly installed USB drivers
  • 3. Unstable USB controller
  • 4. Incompatible USB interface
  • 5. The Windows version is outdated even incompatible with the USB
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Part 2: Figure out “USB device not recognized”

Method 1: Check Connection between USB Devices and Ports or Replace Cable

If the USB port are not working, USB flash drive or USB splitter will fail to work as a result. If so, please try the 2 methods below:

1. Restart computer and connect the USB device to USB port again.

Please check the recognition and reading of your device after restarting computer and connecting the USB device.

2. Replace USB Cable.

If the computer still fails to find devices like USB disk and SD card, please connect the device to computer with another new USB cable.

Method 2: Device Manager

1. Try “Scan for hardware changes” function in Device Manager

① Step 1: Right-click the Start menu and then [Run].

select run in windows start menu
Step 2: Input [devmgmt.msc] in the pop-up window and press “Enter” to continue.
open device manager
Step 3: Find and click [Computer] in Device Manager. Select [Scan for hardware changes] in the menu.
scan for computer hardware changes when usb ports are not working
Step 4: Please check the recognition of the USB device again after scan finished.
2. Disable and then Enable USB Controller

Step 1: After accessing [Device Manager] by following the steps above, find and double-click [USB Serial Bus controllers].

disable USB ports in computer's device manager
Step 2: Right-click the USB controller in the drop-down list and select [Uninstall] one by one.
how to repair undetected micro sd card by uninstalling drivers
Step 3: Restart computer and Windows will reinstall related USB controllers automatically. After that, please check the status of your USB devices. Following methods could help if the problem still exists.

Method 3: Try USB selective suspend setting

The USB selective suspend feature, a power management function, will suspend the power supply for the USB devices which are not activated and reduce overall power consumption. Although USB selective suspend feature can help battery of laptop and tablet gets a longer lifespan, it may make you impossible to use your USB devices. Disabling this function may help when you encounter such situations.

Steps of How to Disable the USB selective suspend:

Step 1: Right-click at the Start menu and search [Control Panel].

click windows control panel
Step 2: Click [Hardware and Sound] then [Power Options]. Please go to [Change plan settings] next to the plan option you are using now.
change power plan settings in control panel
Step 3: Go to [Change advanced power settings] next.
how to change advanced power settings on windows
Step 4: In the pop-up window, please expand [USB settings] >[USB selective suspend setting]. Click and change the USB selective suspend settings to [Disabled] and confirm with [OK].
disable usb selective suspend settings
Methods above could help you solve the problem and get access to the USB disk. But what should be done if the important files get lost? Renee Undeleter is here to help.

Part 3: Recover Lost Data due to USB Error

① Download and install Renee Undeleter.
press to the download button
mac download button gif
② Launch Renee Undeleter and then select desired scan mode basing on your needs.

Fast Partition Scan: Find out mistakenly deleted files or emptied recycle bin.

Whole Partition Scan: Recover data from disk which requires to be formatted or has been formatted

Whole Disk Scan: Recover data from disk after system reinstallation.

data recovery in renee undeleter
③ Connect target USB disk to computer and select it in the list. Select a scan mode, Fast scan or Deep scan and click [Next].
select fast scan mode in renee undeleter
④ Select the types of the files you want to recover. Click [Next] to process the scan.
select file types to recover
⑤ Check and previews files before recovery. Select target disk and click [Recover].
select the target files to recover in fast partition scan
select the destination to save the recovered files in renee undeleter to restore sd card to full capacity
Attention: Please scan disk and recover data with Renee Undeleter once you lost data. New written-in data may damage or even overwrite the deleted data. As a result, data recovery will not work anymore.