How to Fix error 0 [with 5 Methods]

Are you looking to fix the ' error 0' problem on your Mac? In this guide, you'll learn simple fixes, starting from the easy ones to the complex ones. Keep scrolling!

Table of Contents

When the error " error 0" occurs, it is a sign that your Mac's disk management system is facing a mounting issue. In this guide, we've reviewed five effective methods to overcome this obstacle and regain control over your hard drive.

From checking connection issues to reformatting, we've reviewed some solutions that promise to resolve the " error 0" error and put your disk back on track for seamless operation.

What Is error 0

The " error" message shows underlying issues with the drive or macOS, rendering the disk unmountable through the Disk Utility's Mount feature, which is necessary when you mount a disk on Mac.

Sometimes, you can find that your disk is mounted but can't be ejected or viewed. As a result, access to photos, videos, documents, and other files on the hard drive becomes impossible. This error appears with varying codes based on your macOS version and the connected hard drive.

disenter error 0 on Mac

Therefore, you might encounter the error alongside codes other than 0. For instance, you might see variations like " error 49223/221" or " error 119930868".

In addition, the " error 49244" error means you can't access the external hard drive content.

Protect Data Before Fixing the External Disk Error 0

Facing the ' error 0' on your Mac should not alarm you. There are easy fixes that you can apply to resolve this error.

However, before delving into these solutions, you must safeguard your data first. This is because unexpected disk issues can sometimes lead to data loss. As an all-in-one backup and recovery tool, EaseUS Data Recovery Wizard for Mac secures your valuable files with only three steps.

The EaseUS recovery software can recover permanently deleted files on Mac. Whether it's formatting, corruption causing the disk error, or accidental deletion, this software can recover your data swiftly and efficiently. It also can recover files from external hard drives not detected on Mac.

By creating a backup with EaseUS Data Recovery Wizard for Mac, you'll have a safety net in case the troubleshooting process affects your files. And you can perform the external hard drive recovery on Mac quickly with the backup. Check out the following steps:

Step 1. Click "Disk Backup" > "Create Backup" > "Next" in EaseUS Data Recovery Wizard for Mac's main interface. You can create a drive backup image file in case the data is overwritten.

create disk backup with EaseUS

Step 2. Select an internal volume to back up, and click "Create Backup". If you want to create backups and recover data from an external hard drive, USB flash drive, or SD card, remember to connect the storage device to your Mac in advance.

choose a disk to back up

Step 3. Choose a place to save your backup files, and change the name of your backup file, then click "Save". It is not wise to save backups in the same storage device that you want to recover data from.

choose a destination to save disk backup

How to Fix error 0 on Mac

Encountering the " error 0" on your Mac can be frustrating and hinder normal disk operations.

Let's explore practical solutions to troubleshoot and fix this error and enhance the smooth functioning of your Mac's disk management.

Fix 1. Check Connection Issues

Ensuring a secure physical connection for your external hard drive is vital for smooth mounting. Be sure to confirm the cable and the functionality of the USB port before proceeding to the next steps.

To do this, disconnect and reconnect the drive. Alternatively, connect it using a different cable or insert it into an alternative USB port on your Mac. These simple techniques should aid in resolving the " error 0" if it results from connectivity issues.

The " error 49218" occurs when mounting an external hard drive on your Mac unsuccessfully, which means you can't access stored data on the external hard drive, including stored documents, photos, videos, and more. In this case, use the professional data recovery software EaseUS Data Recovery Wizard for Mac to recover your lost data.

Fix 2. Restart Your Mac

Sometimes, an unsuccessful mount could be due to a temporary bug in macOS. Restarting or hard restarting your Mac is a simple solution to refresh the operating system and remove these temporary system errors.

To restart your Mac:

Step 1. Click on the Apple icon at the top left corner of your screen.

Step 2. Select "Restart" from the drop-down menu.

Restart Your Mac

If this doesn't resolve the issue, it's essential to verify the formatting of your hard drive. This is particularly relevant if you've previously used the drive on Windows or Linux machines.

macOS might not be compatible with all file system formats, meaning it won't be able to mount the disk and access its files.

Verify the compatibility of the drive's file system with macOS

When macOS can't read a drive, it won't be able to mount it. For instance, a Linux hard drive is not readable on a Mac. As of now, macOS supports the following file systems:

  • FAT32
  • APFS
  • exFAT
  • HFS+ (or Mac OS Extended)
  • NTFS (with read-only support)

However, some users encounter this error when inserting an NTFS or exFAT drive into a Mac. This happens because the drive was formatted on Windows for cross-platform usage. Not all Windows allocation unit sizes (block sizes) are supported by macOS.

You can update your macOS to address this problem or reformat the drive on a Mac; for example, format a USB to FAT32 on a Mac. If this method doesn't word, install EaseUS Data Recovery Wizard for Mac to restore the stored data on the unmounted drive to avoid data loss.

Share this article on social media to help others learn how to fix the " error 0" error on Mac.


Fix 3. Run First Aid in Disk Utility

The First Aid feature, accessible in Disk Utility, is helpful. It lets you verify and correct system errors concerning directory structure and formatting.

When faced with the " error 0" message in Disk Utility, initiating a First Aid scan is advisable. To access First Aid:

Step 1. Launch "Disk Utility" via "Applications > Utilities".

Step 2. Select the unmounted drive from the left-hand list.

Step 3. Click on "First Aid" and proceed by clicking "Run".

After finishing the process, you'll see a detailed report, such as "First Aid found corruption that needs to be repaired". Ensure to address any errors flagged by First Aid during the scanning process. Suppose the First Aid process fails; don't panic; check out this article to solve the problem.

First Aid process has failed

Disk Utility First Aid Process Has Failed [with 5 Proven Ways to Fix It]

This article discusses 5 proven ways to fix the First Aid process issues. Read more >>

Fix 4. Mount the Disk via the Terminal

Terminal, a command-line interface in Mac, can manage your operating system and implement various changes. In cases where mounting encounters logical errors leading to a refusal to mount the hard drive, Terminal can act as a conduit, granting you access to the system's core, allowing for hard drive mounting through command-line actions.

Follow these steps:

Step 1. Navigate to "Finder > Applications > Utilities" to open Terminal.

Step 2. Input diskutil list to display all drives on your Mac. Identify the unmountable drive by its identifier.

type the command in terminal

Step 3. Input diskutil mount /dev/disk1s2 command to mount the drive. Replace 'disk1s2' with the identifier of your unmountable drive.

tyep the second command in Terminal

Fix 5. Reformat the Problematic Disk

If other solutions fail to resolve the " error 0", reformatting your hard drive should be your final attempt.

Reformatting is often effective for various disk issues since it wipes the drive clean and resets it. However, it's important to note that this approach has a drawback - it results in losing all data stored on the drive unless you make a backup before reformatting the external hard drive. If not, use EaseUS Mac data recovery software to recover the formatted hard drive on Mac.

Follow the steps below to reformat the hard drive on Mac:

Step 1. Open Disk Utility and select the hard drive you want to format in the left list.

Step 2. Click "Erase" in the top menu, choose a new format, and rename the hard drive if you want.

macos extednded

Step 3. Click "Erars" again to confirm.

If you aren't sure which format is better on macOS, this article may help you.

apfs vs mac os extended

APFS vs Mac OS Extended [Beginner's Guide]

This article discusses which format is better on macOS: APFS vs. Mac OS Extended. Read more >>

If you don't have crucial data or have recovered any lost data, you can erase the drive and reinstall macOS via Recovery mode.

First, head to "Disk Utility", choose your drive, and erase the data. Afterward, return to the main window and initiate the "Reinstall macOS" process.


This article introduces 5 practical methods to fix the " error 0" and rectify your disk issue on your Mac.

However, if you have accidentally deleted important data, you can use a data recovery tool like EaseUS Data Recovery Wizard for Mac to retrieve your data. This software helps you recover deleted documents, videos, music, and movie files. It is efficient and easy to use, even for beginners. error 0 FAQs

There are tons of frequently asked questions about the error 0. These include:

1. How do you fix a hard drive that won't mount on a Mac?

For resolving a Mac drive that won't mount, use these solutions:

  • Remount your disk connection in Disk Utility.
  • Restart the Mac.
  • Reformat the drive.
  • Adjust display settings for your macOS drive.
  • Reconnect the drive to your Mac.
  • Utilize Disk Utility's "First Aid" feature.

The methods mentioned above also work when the "couldn't unmount disk. : (-69888)" error occurs on your Mac.

2. How do I force my Mac to mount a hard drive?

To force your Mac to mount a hard drive, here are the steps to follow:

Step 1. Establish the connection with the drive on your Mac.

Step 2. Launch "Disk Utility" on your system (navigate to Finder > Applications > Utilities and open Disk Utility).

Step 3. Identify and choose your external HDD in the sidebar.

Step 4. Click on the "Mount" option at the top.

3. Why can't I unmount my hard drive Mac?

This error can arise from various factors, such as an abrupt system shutdown and an inconsistent file system. Other causes contributing to this error include:

  • Human Error: Incorrectly deleting or formatting files or data during ongoing operations can trigger disk errors.
  • Interruptions in Read/Write Operations: Disruptions during data access or system operations can lead to data loss or corruption.
  • Forced or Accidental Data Formatting: Accidentally deleting critical systems or data files can result in data loss or erroneous disk functioning.
  • Virus Attacks: Malicious software attacks can compromise data integrity, often stemming from unsafe software or unauthorized website access.

Other causes can be system-related, such as bootstrap errors, incorrect kernel installation, hardware or software failures, etc.

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Updated by Brithny

Brithny is a technology enthusiast, aiming to make readers' tech lives easy and enjoyable. She loves exploring new technologies and writing technical how-to tips. In her spare time, she loves sharing things about her game experience on Facebook or Twitter.

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