Error 0x800701B1

error 0x800701b1

Some Windows 10 users are regularly encountering the 0x800701b1 error code (A device that does not exist was specified) when trying to copy, paste, or replace files using File Explorer. This error code is also reported in instances when users attempt to install Windows 10 on a hard drive connected through a USB port.

Copy-pasting files or folders from one hard drive to another is usually an easy and error-free process in Windows 10. But several Windows 10 users are complaining about the 0x800701B1 error on their computer when they are doing a file/folder transfer, regardless of the size of data being copied.

What Causes Error Code 0x800701B1 on Windows 10

As it turns out, there are several different causes that might end up producing this particular error code. Here’s a shortlist of potential culprits that might be responsible for the apparition of the 0x800701B1 (A device which does not exist was specified):

  • USB 2.0 port is insufficient – Depending on what type of HDD / SSD drive you’re encountering this issue with, you might need to connect it to a USB 3.0 port in order to ensure that you meet the required transfer speeds and power output.
  • Inconsistent / Incompatible driver – According to some affected users, you can expect to see this error code if you’re using a generic driver for the external drive that is triggering this error code. In this case, you might be able to fix the problem by reinstalling the dedicated driver.
  • Insufficient PSU Output – If you have an average PSU and a lot of connected peripherals that are currently drawing power, you should consider the fact that your power source might not be enough to handle every device. In this case, you can fix the issue either by upgrading your PSU or by disconnecting some non-essential peripherals.

How to Fix It

When it comes to fixing error 0x800701b1, there are numerous things for you to look at and for you to consider. Before we touch on anything complex, below are some simple tips I suggest you try.

The first thing I suggest you do is consider limiting the size of the files you are attempting to transfer to and from your external drive. Of course, whether or not you can implement this idea, depends greatly on when the error occurs. But assuming it occurs while using an external drive. You’ll want to limit your file size to 10GB at the very most.

Transferring large files puts a heavy toll on your system, especially if it’s relatively old. So you should definitely try breaking up your file transfers into small more manageable chunks.

If the above solution fails to fix the problem, then I suggest you attempt the many solutions outlined below.

Solution 1: Connect Your External Devie via Another USB Port

Connect Your External Devie via Another USB Port

The error 0x800701B1 might happen due to insufficient power or insufficient transfer speed. USB 3.0 usually has a higher data transfer rate and provides more efficient power management.

If there are multiple USB ports on your computer, please try connecting your external hard drive or USB flash drive to your computer via a different USB port. If your external drive is designed with a USB 3.0 interface, you’d better plug it into the USB 3.0 port instead of a USB 2.0 port.

Solution 2: Remove other peripherals

If this error is caused by insufficient power issues, try disconnecting all the other devices connected to your computer. Simply plug all of them out.

If you’re using a laptop, disconnect absolutely all your peripherals, and keep only the external HDD connected. You can use your trackpad to control your device. Check if the error is gone.

Solution 3: Update or Reinstall the Disk Driver

An outdated or corrupted disk driver could also lead to the error code 0x800701B1. To solve the problem in this case, you can try updating or reinstalling the driver software. Here is the detailed tutorial.

Update or Reinstall the Disk Driver

Step 1: Right-click the Start button and select Device Manager.

Step 2: In Device Manager, double-click the Disk drives category to expand it. Then right-click your USB drive and select Update driver.

Step 3: In the pop-up window, select Search automatically for updated driver software. Then follow wait patiently when the latest driver is downloaded and installed.

Step 4: Once the driver update is installed, restart your computer.

Step 5: If error 0x800701B1 appears again, go to Device Manager, right-click your USB drive, and select Uninstall device. After uninstalling the driver, restart your computer and the driver will be reinstalled automatically.

Solution 4: Upgrading your PSU (Desktop only)

Upgrading your PSU

If none of the methods above have worked for you, you might start investigating your PSU (Power Supply Unit). If you’re encountering this problem on a desktop device, the power that your PSU can supply might be insufficient to maintain the demands of all your PC components.

Keep in mind that an SSD will take around 3 watts, while normal 3.5 HDDs will take around 10 watts of power. Depending on the rest of your components (particularly if you have a demanding video card), your PSU might be unable to cover it.
If you have an extra peripheral currently connected, remove every non-essential one and see if the problem stops occurring.

In case the error code stops occurring while non-essential peripherals are disconnected, it’s clear that you’re dealing with a PSU issue – In this case, you need to go for a PSU of over 500W (real capacity).

Solution 5: Change the Security Options for the USB Drive

Another reason for Error 0x800701B1 “a device which does not exist was specified” is that you are not allowed to access your USB drive due to the security permission issues. To fix the error, you need to change the Security settings for your USB drive by following the steps below.

Step 1: Press Win + E to open File Explorer.

Step 2: Click This PC in the left pane and right-click your USB drive. In the pop-up window, select Properties.


Step 3: In the pop-up window, go to the Security tab and click the Advanced button.

click the Advanced button

Step 4: In the Advanced Security Settings for USB drive window, click the Change button. Then click the Advanced button in the Select User or Group window.


Step 5: In the following window, click the Find Now button. Then double-click your user’s name under the Search results section. When you go back to the Select User or Group window, click OK to confirm the changes.

click the Find Now button

Step 6: When you go back to the Advanced Security Settings for USB Drive window, check the “Replace all child object permission entries with inheritable permission entries from this object” option.

Replace all child object permission entries

Step 7: Click Apply and OK to keep the change.

Now, you can check whether the error 0x800701B1 has been solved.

Solution 6: Perform a Check Disk Scan of the USB Drive

The USB flash drive may show the device not specified error if the drive has logical file system errors. In this case, performing a Check Disk (CHKDSK) scan of the drive may solve the problem.


Step 1: Perform a CHKDSK scan of the drive and let the process complete (this may take some time to complete).

Step 2: Once the CHKDSK process is complete (without any issues), then check if the system is clear of the flash drive error.

Step 3: If the issue persists, unplug the USB drive and shut down your system (not reboot).

Step 4: Then power on the system with the bare minimums and plug back the USB to check if the USB drive is functioning normally.

If the issue persists, then check if the drive works fine on another system (preferably with a different OS), if so, then format it at that system and then try on your system. If the issue is still there, then you may try a 3rd party application (e.g., Diskinternals Uneraser) to solve the problem or otherwise get the USB drive checked for hardware errors (you may change the USB controller to solve the issue).

Solution 7: Replace your external HDD

Maybe your external HDD is the culprit. If the HDD is wearing out, errors and glitches will become the norm. Test if error 0X800701B1 still occurs if you’re using a different HDD.

If the error is gone, consider purchasing a new external HDD or better yet, an SSD if you really want to upgrade your gear.
Hit the comments below and let us know if you managed to get rid of this error.


What is PSU?

A power supply unit (PSU) converts mains AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use switched-mode power supplies. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the mains voltage.

Most modern desktop personal computer power supplies conform to the ATX specification, which includes form factor and voltage tolerances. While an ATX power supply is connected to the mains supply, it always provides a 5-volt standby (5VSB) power so that the standby functions on the computer and certain peripherals are powered. ATX power supplies are turned on and off by a signal from the motherboard.

Does CHKDSK fix corrupt files?

How do you fix such corruption? Windows provides a utility tool known as chkdsk that can correct most errors on a storage disk. The chkdsk utility must be run from an administrator command prompt to perform its work.

What is 0x800701b1 error?

Error 0X800701B1 ‘A device which does not exist was specified’ is a Windows 10 error code that indicates a drive is not present. It usually occurs when your computer failed to copy-paste or transfer files to or from that drive.


Error code 0x800701B1 can be annoying because you won’t be able to copy your files to another drive without it being resolved. Your only option is to upload the files to the cloud and copy it from there using another computer. But if you want to directly transfer the files from your computer to your external drive or USB, you can follow our guide above to deal with this error.

1 Comment

  1. blank

    Feel your site has provided much more clarity on the problem with this error code and how to fix it.
    I don’t understand the nature of the problem. Here is why.
    My machine will not update to the second half Windows 10 2020 update. I have consistently gotten this error message.
    Unfortunately for me I have and large number of external USB drives that I plug in and out.
    1. I have no idea what USB drive the error code is referring to.
    2. To the best of my knowledge, i have typically not received data transfer error messages USB or otherwise.
    I know you all are probably really busy – i hope that someone could help shed light on this.

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