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# How to Fix ‘Operation Can’t Be Completed Error -36’ on Mac: Step-by-Step
- URL: https://macfixly.com/fix-error-36-mac/
- Published: 2026-10-02T14:21:00.000Z
- Updated: 2026-10-02T14:21:00.000Z
- Description: Discover practical steps to fix the operation can't be completed error -36 on Mac and safely copy your files without interruptions.
- Author: Macuser
- Tags: Mac Troubleshooting, File System Errors, Data Protection, Disk Utility, Mac Maintenance

You’re copying important files on your Mac when suddenly a message pops up: “The operation can’t be completed because an unexpected error occurred (error -36).” This frustrating interruption often halts your workflow and leaves you wondering how to get your files moved safely.

This article guides you through a clear, step-by-step approach for the operation can't be completed error -36 on Mac fix. You’ll learn practical methods to resolve this error by understanding the underlying file system conflicts and hardware checks. Each step helps you protect your data while troubleshooting effectively.

## Key takeaways

- Use the Terminal’s dot\_clean command to remove hidden file conflicts causing error -36.
- Run Disk Utility First Aid to check and repair your disk’s file system.
- Reset file permissions and Access Control Lists (ACLs) on problematic files or folders.
- Try copying files in smaller batches or one at a time to isolate issues.
- Check cables, ports, and external drives to rule out hardware causes before seeking professional help.

## Before you start: What you need to know and prepare

The ‘operation can’t be completed error -36’ on Mac typically stems from file system conflicts or input/output issues. This often involves hidden files like.DS\_Store or problems with disk corruption. Understanding this helps you approach the fix methodically.

Backing up your important files is crucial before you begin any troubleshooting. Without a backup, you risk losing data if something goes wrong. Many users encounter this error when copying files between drives or from external devices, where hidden file conflicts or hardware faults are common causes.

You will also need administrative access to your Mac, as some commands require it. Make sure you know exactly which drives or files are affected and their locations. Finally, close all applications that might be using these files to avoid interference during the repair process.

1. Identify the files or folders triggering error -36 and note their locations on your Mac or external drives.  
*When done, you should clearly know the scope of the problem.*
2. Ensure you have a current backup of these files, either on an external drive or cloud storage.  
*After this, your data will be safe if something unexpected happens.*
3. Close all apps that might be accessing the affected files, including Finder windows showing those locations.  
*The files should no longer be in use, reducing conflicts.*
4. Confirm you have administrative rights by checking under System Preferences > Users & Groups.  
*You should see your account marked as Admin.*

## Use the Terminal dot\_clean command to remove hidden file conflicts

Mac creates hidden files prefixed with.\_ to store metadata when copying to non-HFS volumes. These.\_ files sometimes cause the “operation can’t be completed error -36” by conflicting with the actual files during transfer or duplication. Running the Terminal command **dot\_clean** merges these hidden files with their associated data files, resolving many such conflicts.

1. Open the *Terminal* app from Applications > Utilities.
2. Type `dot_clean `followed by a space.
3. Drag the folder or drive where you encountered the error into the Terminal window to automatically add its path.
4. Press **Return** to run the command. There is no output if it succeeds.
5. Try copying or moving your files again. The error should no longer appear.

For example, before running `dot_clean`, a copy attempt might show:  
*cp: error -36: Finder can’t complete the operation because some data in “examplefile” can’t be read or written.*  
After running `dot_clean`, repeating the copy should complete quietly without errors, confirming the hidden file conflict is resolved.

## Check and repair your disk with Disk Utility First Aid

[Disk corruption or file system errors](https://macfixly.com/p/607de035-d874-4f0b-9c00-18d2f2bf5e50/) can trigger the ‘operation can’t be completed error -36’. Using Disk Utility’s First Aid tool helps identify and repair these issues. Follow these steps carefully to check your disk and apply repairs if needed.

1. Open **Disk Utility** from the Utilities folder inside Applications. You will see a list of drives and volumes on the left side.
2. Select the drive or volume where the problem occurs. For example, if the files are on your main hard drive, select “Macintosh HD” or the name of your boot volume.
3. Click the **First Aid** button in the toolbar at the top. A dialog will ask if you want to run First Aid on the selected disk; click **Run**.
4. Disk Utility will check the disk for errors and attempt to repair them. During this process, messages like “Checking file system” or “Verifying volume” appear.
5. If First Aid completes with a message such as “The volume appears to be OK,” your disk is healthy. If it reports it has repaired some issues, try your file operation again.
6. If First Aid reports errors it can’t fix, you may see a message saying “First Aid found errors that it could not repair.” In this case, back up your data immediately and consider reformatting the disk or seeking professional help.

Disk Utility’s First Aid tool is effective in resolving many file system problems that cause error -36\. It’s a good next step after removing hidden file conflicts.

## Clear file permissions and reset ACLs on problem files or folders

Error -36 can occur when file permissions or Access Control Lists (ACLs) are corrupted or overly restrictive, blocking the system from copying or moving files. To check permissions, select the file or folder in Finder and choose **File > Get Info**. Under the **Sharing & Permissions** section, you can see which users have read or write access. Alternatively, open Terminal and type **ls -le** followed by the file path to view detailed permissions and ACLs.

![Clear file permissions and reset ACLs on problem files or folders – operation can't be completed error -36 on Mac fix](https://macfixly.com/content/images/2026/10/fix-error-36-mac-2.webp)

To reset permissions safely, use the Terminal command **chmod -R u+rwX,g+rwX,o+rX** on the affected files or folders. This grants the owner read, write, and execute permissions, the group read and write, and others read access, while preserving directory traversal rights. Then, clear ACLs with **chmod -R -N** on the same path to remove custom ACL entries that might cause conflicts.

For example, before resetting, a file's permissions might show restricted access to you, causing the copy to fail. After resetting permissions and clearing ACLs, the file operation completes successfully without error -36\. This step ensures your user account has the necessary rights, eliminating permission issues as the source of the error.

1. In Finder, select the problem file or folder and choose **File > Get Info**. Confirm the *Sharing & Permissions* section shows your user with *Read & Write* access.
2. Open Terminal and enter **ls -le "path/to/file-or-folder"**. Review permissions and note any unusual ACL entries.
3. Run **chmod -R u+rwX,g+rwX,o+rX "path/to/file-or-folder"**. You should see no error messages, indicating permissions updated.
4. Run **chmod -R -N "path/to/file-or-folder"** to clear ACLs. No output means success.
5. Try copying or moving the file again. It should complete without error -36.

## Try copying files in smaller batches or individually

Large or mixed file transfers can overwhelm your Mac’s file system or reveal hidden issues with specific files, leading to the error -36\. When you attempt to copy a big group of files at once, the process is more likely to encounter a problematic file or resource bottleneck that interrupts the entire operation. To avoid this, try dividing your files into smaller groups or copying them one by one.

This approach helps isolate which file or folder may be causing the error. If a smaller batch copies successfully, but another fails, you can narrow down the problem to that particular subset. By repeating this process, you can identify the exact file triggering error -36, allowing you to examine or replace it separately.

Many users experience higher success rates when copying in smaller batches compared to large bulk transfers. While it takes more time, breaking up the transfer reduces resource overload and pinpoints issues more effectively.

1. Select a small group of files (for example, 5 to 10) from the original batch you want to copy. When the transfer completes without error, proceed to the next group.
2. If the copy fails, narrow down further by copying files individually from that failing group. Successfully copied files are safe; the one that fails is likely problematic.
3. Once you identify the file causing error -36, consider renaming, moving, or recreating it before retrying the transfer.

## Use alternative file transfer methods like AirDrop or cloud syncing

If you encounter error -36 due to local disk or file system issues, transferring files through alternative pathways can help bypass these problems. AirDrop and cloud syncing services offer reliable methods to move files without relying on direct file system access.

### Using AirDrop for file transfer

1. Open Finder and select the files or folders you want to transfer. When selected, you should see them highlighted.
2. Click the Share button in the Finder toolbar and choose AirDrop from the dropdown menu. The AirDrop window will open, showing nearby Apple devices.
3. Ensure the receiving device has AirDrop enabled and is discoverable by "Contacts Only" or "Everyone." You should see its icon appear in the AirDrop window.
4. Drag your selected files onto the receiving device's icon. Once done, the receiving device will prompt to accept the files, indicating a successful transfer.

### Using iCloud Drive or another cloud service

1. Open Finder and locate the files you want to upload. Highlight the files for upload.
2. Drag these files into the iCloud Drive folder in Finder or upload them through the cloud service’s app or web interface. You will see a progress indicator or confirmation when upload completes.
3. On the destination device, open the cloud service app or iCloud Drive folder and download the uploaded files. Download completion means your files are accessible without triggering error -36.

These methods successfully avoid error -36 by circumventing direct disk-to-disk copying, which can fail due to hidden file conflicts or disk corruption. Using AirDrop or cloud syncing is especially helpful when copying large batches or files with complex metadata that might trigger file system errors.

## Troubleshoot hardware issues: check cables, ports, and external drives

Hardware problems often cause the ‘operation can’t be completed error -36’ due to input/output (I/O) failures. Faulty, damaged, or loosely connected cables and ports can interrupt data transfer, triggering this error. Begin by inspecting your USB, Thunderbolt, or other connection cables for visible damage or wear. A loose connection might be the culprit, so firmly reconnect the cable and see if the error persists.

Next, test the external drive with a different cable or connect it to another port on your Mac. If the error stops occurring, you’ve likely identified a faulty cable or port. Additionally, use the System Information app (found under Apple menu > About This Mac > System Report) to check the health and connection status of your external drive. Look for any warnings or irregularities under the USB or Thunderbolt section.

For example, a common case involved a USB cable with internal damage that caused intermittent connections and error -36 during file copying. Replacing the cable resolved the issue immediately. Testing hardware connections systematically helps you avoid unnecessary software troubleshooting and protects your data integrity.

1. Inspect your cable and port for visible damage or looseness and reconnect securely. If the error disappears, the connection was the problem.
2. Swap the cable with a known good one and connect again. Success indicates a faulty cable.
3. Try a different port on your Mac. If the error stops, the original port may be malfunctioning.
4. Open System Information (Apple menu > About This Mac > System Report) and select USB or Thunderbolt to verify the external drive’s connection status. A healthy device appears without warning icons.

## When to seek professional help or consider data recovery

If you notice persistent clicking noises, unusually slow drive response, frequent disconnections, or the drive not mounting at all, these are signs your hard drive may be experiencing physical failure. At this stage, continuing with software fixes or DIY recovery attempts can worsen the damage and reduce the chances of successful data retrieval.

![When to seek professional help or consider data recovery – operation can't be completed error -36 on Mac fix](https://macfixly.com/content/images/2026/10/fix-error-36-mac-3.webp)

Software tools and Terminal commands have their limits; they cannot repair mechanical or severe hardware faults. Attempting do-it-yourself data recovery on failing drives risks overwriting or corrupting your data irreversibly. Professional data recovery services use specialized cleanroom environments and advanced techniques, often achieving a much higher success rate when physical damage is involved.

Consider these steps before contacting professionals:

1. Stop using the affected drive immediately to prevent further damage. You should see the drive remain powered off and disconnected.
2. Document error messages and symptoms to provide clear information to the recovery service. You will have detailed information to share when requested.
3. Contact a reputable data recovery provider that specializes in your specific drive type. Look for companies with certified cleanrooms and positive reviews.
4. Request an evaluation or diagnosis, which many services offer free or at low cost, to understand recovery feasibility and costs.

Choosing professional help early improves chances of recovering your data safely and reduces the risk of permanent loss.

## Frequently asked questions

### What exactly does error -36 mean on a Mac?

Error -36 is a generic I/O (input/output) error that macOS throws when it encounters a problem reading or writing files. It usually indicates that the system has trouble accessing or copying certain files, often due to hidden or corrupted metadata. This error commonly appears when copying files between drives or across network shares.

### Can I fix error -36 without losing my files?

Yes, in most cases you can fix error -36 without losing any data. The error often results from hidden files or file system conflicts rather than actual file corruption. Using tools like the Terminal's **dot\_clean** command or Disk Utility to repair disks can resolve the issue safely without deleting your files.

### Why does dot\_clean often fix this error?

The **dot\_clean** command merges hidden.\_ files with their associated data files, removing conflicts caused by these metadata files. macOS creates these hidden files to store extra information, but they can become corrupted or incompatible, triggering error -36\. Running dot\_clean cleans up these conflicts, allowing the copy or move operation to complete successfully.

### Is error -36 related to a failing hard drive?

Error -36 is not always caused by hardware failure, but it can be a symptom if underlying disk issues exist. If disk errors persist after software fixes like dot\_clean and First Aid, it’s wise to check the drive’s health using Disk Utility or third-party tools. Persistent error -36 alongside other symptoms may indicate a failing drive that requires professional attention or data recovery.

## What This Advice Does Not Cover

This guide focuses on common software and hardware troubleshooting steps for error -36, but it does not cover data recovery from severely physically damaged drives. If your drive has suffered physical trauma or you face critical data loss, it is best to consult professional data recovery services rather than attempting DIY fixes. Some Terminal commands mentioned require administrative privileges and precise typing; mistakes can cause unintended system changes, so proceed with caution. Additionally, not all error -36 cases stem from the same root cause—some may require hardware replacement or more advanced diagnostics beyond this guide.

The single most useful next step is to run the **dot\_clean** command in Terminal on the affected folder first. This command removes hidden.\_ files that often cause error -36 during file operations and is quick to execute. If that doesn’t resolve the issue, systematically proceed through the other steps here, paying close attention to disk health and file permissions before attempting hardware-related troubleshooting.

**See also:** [How to Fix ‘Disk Not Ejected Properly’ on Mac: Step-by-Step Guide](https://macfixly.com/p/83750a51-961d-4e5f-89c5-47d820d97d90/) · [Fix USB Accessories Disabled on Mac: Step-by-Step Solutions](https://macfixly.com/p/33b93394-a482-4a7a-b8c7-99d06f5063e0/)