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    Technology Manager of Test Dept.


USB flash drive is the portable storage device saving the important content. Of course, it is easy to take and use. Sometimes, we plug the USB flash drive into the computer, but we see the error “Unknown USB Device”. In this essay, we will talk about how to solve this problem.

how to solve the error unknown usb device
Part 1: How If Error Unknown USB Device Appears?
When we plug the USB flash drive into the computer, the computer cannot recognize the device and pop up the notification saying “Unknown USB Device (Device Descriptor Request Failed)”. The followings are the possible reasons.
how if usb is not recognized

1. Incomplete Installation

When the error “Unknown USB Device” appears, you should check whether the USB is plugged well into the computer port, and whether the USB port can work. Try to plug in and out the USB for several times to get the result.

2. Damaged USB

If the USB flash drive is damaged or used improperly, you may see the error “Unknown USB Device”. At this situation, you should change a new USB flash drive.

3. Disabled Plug and Play

Plug and Play is the service that the USB drive can be used instantly when plugged into the computer. When you see the error “Unknown USB Device (Device Descriptor Request Failed)”, you should check if this service is disabled. Then, go to enable the service.
how to solve the error unknown usb device descriptor request failed
Step 1: Search [services] in the computer.
enter service in search box
Step 2: In the following window, navigate to [Plug and Play] and check its running status.
Step 3: Next, right click at this item and select [Properties]. In [Startup type], select [Automatic] and then click on [Start].
Step 4: Now, the service Plug and Play is running.
Step 5: Finally, connect the USB flash drive into the computer again. Check if it works well in [Universal Serial Bus controllers] under [Device Manager].
From the above content, we can solve the error “Unknown USB Device” through 3 ways. Later, if the data is lost from the USB drive, you can use the professional tool to recover the data. Renee Undeleter is here to help you. This software is easy to use. Even though you are a new beginner, you can recover the lost data easily.
Part 2: How to Recover Lost Data with Renee Undeleter?

1. What is Renee Undeleter?

Renee Undeleter is the data recovery software. When the users accidentally delete the important files, empty Recycle Bin, or format the disk/drive, the software can retrieve the deleted data. It contains 4 options, namely fast partition scan, whole partition scan, whole disk scan and image creation. These functions can help the users easily recover the lost data.
Renee Undeleter - Powerful Data Recovery SoftwareRenee Undeleter data Recovery software

Easy to use Only simple steps to recover data from storage devices.

Multiple scan modes Fast partition scan, whole partition scan and whole disk scan for different recovery needs.

File types Support to recover pictures, videos, audios, documents, mails, etc.

Supported storage devices Recover data from recycle bin, SD card, external disk, etc.

Supported systems Windows 10, 8.1, 8, 7, Vista, XP, 2000 and Mac OS X10.6, 10.7, 10.8.

Easy to use Only simple steps to recover data from storage devices.

Multiple scan modes - 3 scan modes for different recovery needs.

Supported storage devices Recover data from recycle bin, SD card, external disk, etc.

Free TrialFree TrialFree Trial

3000 users have downloaded Renee Undeleter and found data back!

2. How to Use Renee Undeleter?

You can follow these steps to recover the lost data with Renee Undeleter.
Step 1: Download and install Renee Undeleter. Open the software and select [Whole Disk Scan].
Note: Don’t install Renee Undeleter in the disk that is to be recovered in case that the disk data is overwritten.
select whole disk scan in renee undeleter
Step 2: Next, select the disk to scan and click on [Next] to go on.
select a disk to recover in renee undeleter
Step 3: Wait for the scan executed by the software.
scanning the whole disk in renee undeleter
Step 4: Next, check the target files among the scan results and click on [Recover] to recover the deleted data.
select taget files to recover with renee undeleter
Step 5: Select a folder to save the recovered files and click on [Recover].
Note: Please save the recovered data in the other partitions or disks, not in the disk where the deleted data was saved. That can avoid that the original data is overwritten by the recovered data.
recover files from whole disk scan with renee undeleter