Lỗi A Device Attached To The System Is Not Functioning

This page talks about error "A device attached lớn the system is not functioning" and provides a couple of workable solutions. This error is annoying, for it may prevent your computer from communicating or transferring data with external devices, or sometimes appears during updating drivers in Windows Device Manager. If you are troubled by same error in Windows 10/8/7, you can try solutions below to lớn get the issue fixed now.

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What is "A device attached to the system is not functioning" error?

When you connect an external device such as memory card, USB flash drive, external hard disk or Smartphone phone lớn computer in order to lớn transferring photos, videos or music files, an error message pops up, saying "A device attached khổng lồ the system is not functioning". The pop-up window can be closed easily via clicking the X button from the top-right corner, as follows:


This error means that your computer cannot properly communicate or transfer data with attached device. Thus, you are likely lớn get this error when your PC is connected with removable drives and there might be something wrong with connection, driver compatibility or USB port quality, etc. In other words, the error indicates that either the external device or computer needs proper maintenance. However, in some cases, the error also shows up in Windows 10 even though there are not any external devices connected, for instance, you may encounter the error when opening a doc, png or any other files.

"Greetings! I have sầu a Dell máy vi tính with Windows Home preinstalled. I was prompted to lớn install some system updates a couple of day ago, và I got them installed, deeming system will get better protection. However, I started to lớn encounter errors. I tried khổng lồ baông chồng up photos from Android phone using a USB cable. But an error, telling the attached device is malfunction, keeps appearing. I tried a new USB cable, but the error still shows up. What is going wrong? The apk device or my laptop? I need your help."

This is not usually regarded as a fatal error, & yet it is rather troublesome, especially when it affects common actions. Are you bephối by the error? No worries, this guide will show you how khổng lồ fix the issue via simple solutions. Just start your way from the first solution until find the working approach.

Causes of error device attached lớn the system is not functioning

A device attached to lớn the system is not functioning error can appear because of many factors, the most common ones are listed below:

The external device is switched off or not properly connected to lớn your computer.Drivers of the attached device are incompatible, outdated, corrupted or faulty.The USB port of your computer is not working.The USB cable is not functioning properly.The application in question is corrupted or damaged.The attached external device is physically or logically damaged, such as bad sectors.There is something wrong with operating system, such as corrupted system files, virtual infection, damaged Windows update files, etc.

How to lớn fix "A device attached to lớn the system is not functioning" issue?

If you are looking for solutions lớn fix "a device attached to lớn the system is not functioning" error, you may as well give a shot of following methods.

Solution 1: Reconnect the device và use a different USB port

Besides, you can try restarting computer before trying reconnection or other USB ports, because most of times, rebooting Windows can fix any problems. There might be some incorrectly configured modules or computer installs system updated, which needs a restart khổng lồ correct errors or implement changes. Remove sầu the device in question before restarting PC và check if the error disappears after rebooting.

This error may show up if there is something wrong with the connection between the attached device & computer, for example, the connector may not be connected properly khổng lồ the USB port, the USB cable or USB port is defective sầu. Hence, it is necessary lớn have sầu a try reconnecting the device and make sure the USB cable is in good condition và correctly connected. Also, you can try a different USB port, for example switch between the 2.0 USB port và the 3.0 on your PC. If there are other removable devices attached to lớn your computer, remove sầu them for the moment so as to lớn rule out the connected will not be affected by other devices.

Tip: It is recommended to lớn safely eject USB drive sầu when you want to remove sầu a working USB disk.

Solution 2: Run SFC (System File Checker)

There is possibility that operating system on your computer contains errors or corrupted files which lead to the issue. So, if you get this error when trying to lớn transfer data between computer and attached devices, you can try SFC to verify if errors exist in system. SFC is the short size of System File Checker và it is a useful Windows built-in utility, helping users to lớn scan system & repair corrupted files. To run SFC, please follow steps below:

Step 1 Launch Commvà Prompt.

In Windows 10 you can easily open Comm& Prompt: type cmd in searching box, right-cliông chồng on the Commvà Prompt in searching result and choose Run as administrator.

Step 2 Type sfc/scannow in Comm& Prompt & hit Enter key.

Then your computer will be scanned for any errors, & the process may will take some time.


If the sfc process finds out and fixes errors, you can restart computer and reconnect the device lớn see if the error is fixed; if you get an error telling that errors are found but fails lớn fix them, you can continue with DISM command: type DISM /Online /Cleanup-Image /RestoreHealth and press Enter key. This command can tải về correct files from Windows update servers to lớn replace corrupted files in your system. This process may take a while according to the speed of your Internet connection. Please wait it to finish.

Solution 3: Update device drivers in Device Manager

The error may also pop up when the device"s drivers are incorrect, corrupted or outdated. On this occasion, you can try reinstalling drivers for the attached device and see if the issue can be removed. Here is how to update drives in Device Manager.

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Step 1 In Windows 10, right-clichồng on the Start thực đơn & choose Device Manager.

For Windows 7 or 8 users, you can try this to lớn launch Device Manager: Press Windows + R khổng lồ open Run dialog > type devmgmt.msc & press Enter key.

Step 2 Navigate the listed hardware and locate the one that is not functioning. Right-cliông xã on the device và choose Update driver.

Step 3 A pop-up window will ask how you want lớn search for driver software, you can choose Search automatically for updated driver software. Then system will tìm kiếm your computer or the Internet for the lademo driver software for the device.

If you have no luchồng the automatic updating method, you can go lớn the device"s trang web to tải về drivers. Once drivers are downloaded successfully, you can repeat the first two steps & choose Browse my computer for driver software. After that you can select the downloaded drivers and cliông xã Next button khổng lồ get them installed.

Solution 4: Cheông xã và repair bad sector for the device

This method will run a complete scanning on the device to verify if there are any bad sectors / blocks on the device. If bad sectors are found, you can try repairing them khổng lồ make the device work again.

Step 1 Download, install and launch ucozfree.com Free Trail version. The choose the device in the software & cliông xã Disk > Verify Or Repair Bad Sectors, as follows:


Step 2 Clichồng Start verify button from the pop-up window và ucozfree.com starts to scan the device.

You can configure settings for the scanning, such as Timeout, and yet it is recommended lớn follow default settings if you vì not have specific requirements.


If the disk indeed has bad sectors, you can cliông chồng Repair button lớn try repairing bad sectors. Please note that repairing bad sectors may cause data loss, please back up important file in advance. For more information, please refer khổng lồ the guide: kiểm tra & repair bad sectors.

Solution 5: Format the device

You can also try formatting the device if the error still exists. Please note that formatting process removes all data off the device, thus you should make sure all important files have sầu been backed up or recovered. If the malfunctioned device is not accessible in Windows, you can use ucozfree.com to lớn backup or recover files:

If files are visible in the software, you can easily copy và save sầu them lớn a different location: choose files you need > right-cliông xã selected data > choose Copy To:


If files are not displayed in ucozfree.com, you can use File Recovery function to perform a scanning to lớn find desired files. After that, you can save sầu files khổng lồ a secure location.


After backing up important data, you can proceed with formatting:

Step 1 mở cửa Windows File Explorer, right-cliông xã on the device that is not functioning & choose Format.


Step 2 Set formatting parameters such as file system type, Allocation unit kích cỡ, format type, etc. & click Start button.

Step 3 Clichồng OK button when system asks confirmation. Then the device will be formatted rapidly.


Windows errors like the one discussed in this guide is really a headache, for it prevents users from performing actions properly on laptop or desktop. Fortunately, most errors have sầu solutions. The above content covers solutions khổng lồ a device attached to the system is not functioning error in Windows 10, & we hope they can help you get rid of the issue successfully. ucozfree.com is all-around disk partition freeware & it is capable of dealing with various issues for you, such as thử nghiệm hard disk, verify bad sectors, recover lost files, etc.. If you find this guide helpful or have any suggestions, please feel free lớn let us know your insights.