qBittorrent is a free, cross-platform, and open-source BitTorrent client and an alternative to µTorrent. It is written in C++ based on Qt toolkit and it is developed by volunteers. However, several users are reporting that they are getting the “ An I/O error occurred” or “I/O error: Permission Denied ”. This error will stop your downloading, and then you need to start/stop it again manually.

qBittorrent I/O Error - 1

qBittorrent I/O Error Fix

What Causes the Input/Output Error for qBittorrent?

We investigated this particular issue by looking at various user reports and the repair strategies that were commonly used to troubleshoot and resolve the issue by users finding themselves in a similar situation. Based on our investigations, there are several different scenarios that are known to trigger this particular error message:

  • No permission for Custom download location – There’s a chance that the issue is caused by a case of permission access. If the downloading location is changed from default to custom, then qBittorrent might need permissions to read and write in that location. Several users finding themselves in a similar situation have reported that they managed to resolve this issue by running the application as an administrator or by keeping the default location for downloading.
  • Windows defender interfering – Another possible case in which this error occurs is when your Windows is using the Windows Defender security system for keeping your system safe. Since the security system stops any untrusted or harmful kind of files, it is possible that it can interfere with your torrent files and make them stop working.

There can be many other unknown reasons for the I/O errors on qBittorrent due to other programs or devices. But for the most related and common ones related to itself and has been solved are mentioned below.

Method 1: Running qBittorrent as an Administrator

As some users have reported, opening the qBittorrent by selecting the option of “Run as administrator” has the potential of resolving the issue automatically. Because when you run any application with run as administrator command, you’re allowing your system to accept that the program is safe to run any of the administrative commands. This also helps qBittorrent with the permissions for the need to access different location on storage. To open qBittorrent as administrator follow the below steps:

  1. Search for qBittorrent in the start menu (Press Windows + S to launch the search bar).
  2. Right-click on qBittorrent , and select Run as administrator Opening qBittorent with run as administrator command
  3. Confirm the User Control warning as “ Yes ”
  4. Now check, if you receive any I/O error.

Method 2: Disabling the Windows Defender in Windows 10

Some affected users, who updated their windows from older version to Windows 10, were able to resolve their issue by disabling the Windows Defender and installing a third party Antivirus. And disabling Windows Defender in Windows 10 is relatively more different as what you would have had to do on Windows 7, 8 or 8.1. You can disable it in two different methods; one is the temporary disable, and the other one is permanent disable of Windows Defender.

The temporary method will be using the conventional Start Menu , in which Windows will re-enable Windows Defender within a couple of days. And the permanent method will be in your computer’s Registry Editor . We are going to do the permanent method and install a third party Antivirus, which can replace Windows Defender work.

  1. Open Run by searching or pressing ( Windows + R ) buttons on a keyboard
  2. Then type in “ regedit ” in the text box and Enter Opening regedit in Run
  3. Locate the WinDefend in the Registry Editor by the following directory: HKEY_LOCAL_MACHINE\System\CurrentContolSet\Services\WinDefend
  4. Then, right-click on the “ Start ” and select Modify
  5. Here you need to change the Value data to “4” Disabling the Windows Defender in regedit
  6. This will disable the Windows Defender Permanently unless you enable it back again in the Registry Editor. Now launch qBittorrent client and see if the permissions issue is resolved.

Method 3: Add User

In some cases, the security settings of the application might be preventing it from being accessed on your account. Therefore, in this step, we will be adding a user from the security settings. For that:

  1. Right-click on the QBitTorrent folder and select “Properties”.
  2. Click on the “Security” tab and then click on “Edit”. Changing permissions from the Security tab
  3. Click on “Add” and then type in the username of your account that you are currently using.
  4. Click on the “Check” button and add this account.
  5. Check to see if doing so fixes your issue.

How to Fix “Printer is in an error state” Issue?

The error “ WinRAR Error: Next Volume Is Required ” usually appears when you’re extracting a multi-part RAR archive and WinRAR can’t find (or can’t correctly identify) the next file in the sequence . This often happens when a volume is missing , stored in a different folder , or renamed in a way that breaks the archive’s expected order .

Fix: qBittorrent I/O Error - 2

In this guide, we’ll go over the most reliable fixes confirmed by affected users, along with what each method is doing behind the scenes so you can choose the right one for your situation.

Important: To extract multi-volume archives, you should always start extraction from the first file in the set. This is usually file.part1.rar , or (in older sets) the main .rar file that comes before .r01 , .r02 , and so on.

1. Download and Place the Missing RAR File

WinRAR needs all parts of a multi-volume archive to complete extraction. This error usually appears when one of the volumes in a set like .part2.rar , .r01 , .r02 , .001 , and similar naming formats is missing . Downloading the missing volume and placing it in the same folder as the other parts allows WinRAR to continue extracting normally .

  1. Look at the error message or review the list of archive parts in the folder.
  2. Identify which volume is missing (for example, part2.rar , .r02 , .001 , etc.).
  3. Go back to the website or source where you downloaded the archive.
  4. Locate and download the exact missing file using the same naming format as the others.
  5. Make sure the new file name matches the pattern of the rest. Example: If you have file.part1.rar and file.part3.rar , the missing one must be file.part2.rar .
  6. Move the downloaded missing volume into the same folder as the other archive parts.
  7. Confirm that all parts are in a single folder before extracting.
  8. Right-click the first file in the series (usually part1 or the main .rar file) and select Extract Here or Extract to Folder .
  9. WinRAR should now detect all volumes and continue extraction normally .

2. Manually Browse & Select the Next Volume

Use this method only if the next volume already exists , but WinRAR is failing to detect it automatically. This can happen due to incorrect naming , the file being in a different location , or a temporary file access issue. Manually browsing helps WinRAR locate the correct volume and resume extraction without interruption .

  1. Right-click the first file in the series (usually .rar or part1.rar ) and select Extract Here or Extract to Folder .
  2. When WinRAR cannot find the next volume, it will show the “ Next Volume Is Required ” message.
  3. A small window will appear, allowing you to manually select the next volume .
  4. Use the file explorer window to locate the folder where the other archive parts are saved.
  5. Select the next part based on the naming order (example: select file.part2.rar after file.part1.rar ).
  6. Make sure the selected file matches the naming format of the archive (no extra characters like (1) and no mismatched numbering).
  7. WinRAR will resume extraction using the selected volume .
  8. If additional volumes are missing or stored separately, WinRAR may prompt you again. Repeat the same process until extraction completes.

3. Rename the RAR files in Order

WinRAR relies on a proper naming sequence (such as file.part1.rar , file.part2.rar , file.part3.rar ) to extract multi-volume archives. If a file is named incorrectly, contains extra characters, or is out of order, WinRAR may fail to locate the next volume and show this error. Renaming the files correctly helps WinRAR follow the sequence and extract the archive without interruptions .

Note: Renaming only changes the file name , not the file contents. The goal is to restore the correct sequence so WinRAR can detect the next volume.

  1. Go to the folder where all the RAR files are saved.
  2. Make sure all parts of the archive are present and stored in the same folder .
  3. Check how the parts are currently named . Common patterns include:
file.part1.rar, file.part2.rar, file.part3.rar
file.rar, file.r01, file.r02, file.r03
  1. Look for files that don’t match the expected numbering pattern (for example, file.part01.rar , file.part1(1).rar , or unrelated names).
  2. Rename each file so it follows the same order without extra characters or mismatched numbering. Example:
Incorrect: file.part1.rar, file.part3.rar, file.part2(1).rar
Correct: file.part1.rar, file.part2.rar, file.part3.rar
  1. Make sure the text before the number is exactly the same for all files.
  2. Only the last part number should change.
  3. Right-click the first file in the series (usually part1.rar or the main .rar file) and select Extract Here .
  4. WinRAR should now recognize the sequence and continue extraction normally .

If you still get the same prompt: the archive set is likely incomplete (a part was never downloaded or was removed), or one of the volumes is corrupt and must be re-downloaded from the original source.