6 Ways to Fix Error Code -36 on Mac

Part 1. What Is Error Code -36 on Mac?

Error Code -36 is a localized I/O error that occurs when the macOS Finder is unable to read or write data to a specific file or folder. This is the infamous Finder error code 36. This error typically appears when you're trying to copy, move, or delete files between different storage locations, such as from an external hard drive to your Mac's internal drive, or between USB drives.

Exact Symptoms and When It Appears

The error usually manifests during file transfer operations, particularly when:

• Copying files from external USB drives to your Mac
• Moving folders between different storage devices
• Transferring data from network drives
• Deleting files from external storage media

Exact Error Message

When finder error code 36 occurs, you'll see one of these messages:

"The Finder can't complete the operation because some data in [filename] can't be read or written. (Error code -36)"

Or: "The finder can’t complete the operation because some data can’t be read or written."

This error message indicates that macOS has encountered corrupted metadata or hidden system files that prevent the operation from completing successfully.

Part 2. Common Causes of Mac Error Code 36

There are several reasons why your Mac might suddenly throw this error. Here are the most common reasons behind this error:

• Hidden Metadata Files: Mac creates invisible files like .DS_Store and ._ (dot-underscore) files that store metadata. When these become corrupted, they trigger error -36.
• File System Incompatibility: Transferring files between different file systems (NTFS, FAT32, exFAT, HFS+) can cause metadata conflicts.
• Corrupted Disk Structure: Physical or logical damage to the storage device can prevent proper file reading or writing.
• Permission Issues: Incorrect file or folder permissions may block the Finder from accessing necessary data.
• Network Transfer Problems: When copying files over a network, connection interruptions can corrupt metadata.
• External Drive Issues: Failing or improperly formatted external drives frequently cause this error.
• Cross-Platform File Transfers: Files moved from Windows to Mac often carry incompatible metadata structures.

Related topic:

7 Best Mac Finder Alternatives in 2026

Part 3. How to Fix Error Code -36 on Mac (Step-by-Step)

If you are staring at that error box right now, don't worry. Follow these five methods to clear the blockage.

1. Use the Terminal dot_clean Command (Quickest Fix)

When you transfer files between your Mac and external drives, hidden files like .DS_Store may appear. These files store Mac-specific settings but can become corrupted, especially when used on other systems such as Windows or Linux. To fix this, macOS includes a tool called dot_clean that merges these hidden files with their original files and removes issues.

Follow these steps:

• Go to "Applications" then "Utilities" on your Mac. Open the "Terminal" app.
• In Terminal, type the command dot_clean.
• Open "Finder" and locate the file or folder causing the issue.
• Drag that file or folder into the Terminal window.

fix mac error code 36 with dot clean command

You will see the file path appear next to the command.

• Press "Return" to execute the command.
• Close Terminal when it’s done.

After this, try using the file or folder again in Finder. The error 36 should no longer appear.

Note:

Be careful when using Terminal commands, as they can change system settings. Always double-check before running any command.

2. Use Disk Utility First Aid to Check & Repair the Disk

When the system reports error code -36, “mac can’t be read or written," it might indicate a deeper issue with the drive’s file structure. Disk Utility is a built-in macOS tool designed to find and repair these small directory errors that prevent Finder from completing its tasks.

Steps:

• Open Finder, then go to "Applications" then "Utilities."
• Find and open the "Disk Utility" app.
• In the top-left corner, click "View" and choose "Show All Devices."
• From the left panel, select the drive that is causing the error.
• Click on "First Aid" in the top menu, then click "Run" to confirm.

Disk Utility will scan and repair any problems on the drive. After the process is complete, you’ll also see a report explaining what issues were found and fixed.

This is especially useful if you experience Mac error code -36 when deleting files.

Restart Mac in Safe Mode

Safe Mode loads only essential macOS components and disables many background processes. This can help you determine whether a third-party app or startup item is interfering with Finder.

For Apple Silicon Macs:

• Shut down your Mac.
• Press and hold the "Power button" until "Loading startup options" appears.
• Select your startup disk.
• Hold the "Shift" key and click "Continue in Safe Mode."

Safe Mode can resolve temporary system conflicts causing an unexpected error occurred error code 36 mac.

For Intel Macs:

• Restart your Mac.
• Immediately press and hold the "Shift" key.
• Release it when the login window appears.

Once in Safe Mode, try copying the files. If it works, the issue was likely a startup program. Restart normally to exit Safe Mode.

Change File Permissions and Paths

macOS is based on Unix, which uses a permissions system to control who can access, edit, or run files. This system helps protect your data, but sometimes it can cause issues. Error code 36 may appear if your account doesn’t have the right permissions to access or modify a file or folder.

Steps:

• Open Finder and find the file or folder causing the error.
• Right-click it and select "Get Info."
• In the "General" section, make sure the "Locked" option is unchecked.
• Move down to the “Sharing & Permissions” section.
• Check your username and see if it has "Read & Write" access.
• If not, click the "lock icon" at the bottom right and enter your password.
• Change the permission to "Read & Write" from the dropdown menu.

If needed, you can undo any changes by clicking the three dots at the bottom of the Info window and selecting “Revert changes.” If the issue still continues, move on to the next solution.

5. Remove Hidden Metadata Files Manually (._ Files, .DS_Store, etc.)_

If dot_clean fails, you can manually target the problematic hidden files. These files are often invisible to the naked eye but can be exposed and deleted using specific commands. This is particularly useful for external USB drives that have been used extensively between different computers.

• Go to “Applications,” then “Utilities” and open “Terminal.”
• In the Terminal window, type the following command: sudo find / -name ".DS_Store" -depth -exec rm {}
• Press the “Return” key to execute the command.
• Enter your administrator password if asked.

This will remove all .DS_Store files from your Mac.

After the process is complete, restart your Mac and check if the error is resolved.

Warning:

Be very careful with the rm command, as it deletes files permanently. Always ensure you are in the correct directory.

Part 4. What To Do If Mac Error Code -36 Persists

When you’ve tried all basic fixes and still face Mac error code 36, the issue may be deeper within Finder or related system files. In such cases, a complete cleanup of Finder-related components and residual files can help resolve persistent conflicts. This is where a professional Mac app manager like Tenorshare Cleamio becomes useful.

Tenorshare Cleamio offers an AI-powered Mac App Manager that can detect hidden system leftovers, corrupted cache files, and Finder-related residual data. It helps eliminate deep-rooted issues that may trigger error code 36 Mac fix failures.

Key features of Tenorshare Cleamio

• Fully uninstall apps and associated hidden files
• Remove stubborn residual Finder cache and metadata
• Clean preferences, support files, and system junk
• Improve Mac performance and stability
• Manage apps uninstallation and updates in one place

Steps to use Tenorshare Cleamio for Finder-related issues

• Open Tenorshare Cleamio on your Mac, then go to the “App Management” section and click “Start” to begin scanning.

• After the scan is complete, open the “App Uninstallation” section and look for Finder-related components. Check for associated cache files, preferences, and support files that may be causing issues. Select the Finder-related files you want to remove and click “Uninstall” or “Clean.”

• Next, go to the “Residual Files” section to review any leftover files. Select unnecessary items and click “Clean” to remove them completely from your system.

Once the cleanup is finished, restart your Mac and try transferring files again to ensure the problem has been resolved. This process resolves deep issues behind the "finder can't complete the operation" error, where some data can't be read or written.

Part 5. How to Prevent Error Code 36 on Mac in the Future

Prevention is always better than cure. Follow these best practices to reduce the chances of facing error -36 again

• Properly eject external drives before unplugging them to avoid file corruption
• Use Mac-compatible file systems like APFS or Mac OS Extended, or exFAT for cross-platform use
• Run Disk Utility First Aid regularly to detect and fix issues early
• Ensure stable network connections during file transfers, especially large ones
• Keep macOS updated to avoid system bugs
• Clean hidden files occasionally using the dot_clean command
• Use reliable storage devices from trusted brands
• Regularly back up your important data with Time Machine or cloud storage.
• Use tools to check your drives' S.M.A.R.T. status regularly.
• Keep at least 10-15% free space on all drives to prevent file system corruption.

These steps will reduce the chances of encountering error code 36 on Mac again.

People Also Ask about Mac Finder Error Code -36

Q1: Why is my Mac not letting me copy and paste?

This could be due to a frozen clipboard process (pboard) or the same permissions issues that cause error 36. Try restarting your Mac or using Disk Utility.

Q2: Is error code -36 a virus?

No, it is a functional I/O error related to file reading and writing. It is not malicious software.

Q3: What is error code 36 on Safari?

In Safari, this usually refers to a connection error where the server fails to respond. It is distinct from the Finder's file transfer error.

Q4: Why do I keep getting "an unexpected error occurred, error code 36 Mac"?

Recurring Mac error code 36 happens when files with '.' and '' in their names become corrupted. Hidden files starting with '.' followed by the original filename cause persistent issues. The Finder is unable to work with these files because it can't find the information it needs.

Conclusion

In summary, fixing Mac error code 36 usually involves clearing corrupted metadata or repairing disk errors. Quick methods like dot_clean often solve the issue instantly, while deeper fixes like Disk Utility or Safe Mode handle more complex cases. For long-term stability, Tenorshare Cleamio is highly recommended to clean residual files and prevent Finder-related problems efficiently. It is the easiest way to ensure you never have to deal with annoying Finder errors again.

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