How to Fix the "Volume Hash Mismatch" Error on Mac

Error: Roll hash mismatch.

If you're a MAC user, you might have stumbled upon a strange warning labeled "Volume Hash Mismatch". This issue can pop up on your computer out of nowhere, being both annoying and frustrating. But what is this error, and what causes it? How can you resolve this pesky problem? In this guide, we'll attempt to find answers to these questions. We'll explain the nature of the error and provide a foolproof solution.

Apple computers running macOS Monterey often encounter issues with a disk hash mismatch. Data stored on your Mac's hard drive can become corrupted, and this information is usually saved as a hash value on the disk. A hash is a unique number used to store data in electronic devices. If there's a discrepancy, it means the hash of the disk doesn't match that of the system. This issue can lead to software glitches, system restarts, or a blank screen. Follow along, and you'll find a solution.

What causes a volume mismatch error?

It's time to put on our detective hats and try to figure out what's causing the “hash mismatch” problem. Here are four main culprits behind this digital headache:

Disk error

Disk errors are a common cause of volume issues. If your Mac's hard drive is unable to read or write data, it might be damaged or deteriorating. This can lead to mismatches between the disk's content and the recorded hash.

Use the First Aid feature of the Disk Utility app on your Mac to check for disk problems. If Disk Utility reports that the disk has issues it can't fix, you should dispose of the drive or get a new one.

File system corruption or error in encrypted data.

File system corruption or incorrect encryption data can also lead to volume issues. The contents of a disk are managed and organized by the file system. Similarly, the information that protects your data from prying eyes is encryption data. Inaccuracies in either of these aspects can alter the functionality of the data and result in a hash mismatch.

3) Hardware issues, such as a failed hard drive.

Hard drive failure is another example of a volume hash issue, indicating that there is a technical or electrical problem with your hard disk, causing it to perform poorly or become unreliable. This situation can lead to hash collisions or data loss. Hardware failures can be caused by various factors, including but not limited to age, usage, fire, or physical damage.

⚔️4. Incompatible macOS or Software Version

Lastly, an outdated version of macOS or incompatible software can also cause hash mismatches. If any components of your system or program are incompatible, it can lead to a hash mismatch. Numerous factors can contribute to incompatibility between macOS and software, such as obtaining a corrupted package or using a macOS version not supported by OCLP4.

Run First Aid	This is a disk utility that can help identify and repair disk errors, including volume hash mismatches. It scans and repairs the file system, which might resolve the issue.
Boot into Apple Diagnostics	This is a tool for diagnosing hardware-related issues, but it may not directly address a volume hash mismatch. However, if a hardware problem caused the mismatch, this can help identify and resolve those issues.
Clean Install macOS	This involves wiping your system and performing a fresh installation of macOS. If damaged system files are causing the volume hash mismatch, this could resolve the issue by providing a clean slate for the operating system.
Downgrade macOS	If the volume hash mismatch issue appeared after a macOS update, this could be helpful. By downgrading, you can revert to a stable version to address the problem.
Reset SMC & NVRAM	While this may not directly target the volume hash mismatch issue, it can help resolve specific hardware or system-related issues that might be causing the mismatch.

Solutions to Fix Mac Volume Issues

Now that you know the cause of the Volume Hash Mismatch error, let's fix it before it affects your Mac's performance. If it continues, you might experience anything from app glitches to spontaneous reboots and black screens.

While this issue persists, you can still fix your Mac and get it up and running. However, it's highly recommended that you back up your data to the cloud or an external device first, so you prevent any potential loss should something go wrong during the process.

Here are six ways to do so.

Solution 1: Run First Aid

Macs come with a utility kit whose “First Aid” feature can be useful here, to diagnose and repair problems.

Start Disk Utility, and select the disk you use to start up your Mac. If there are any file system or disk problems, this utility will fix them.

This is how you open the first-aid kit.

Step 1: Open the Utilities folder by launching Disk Utility or using the Spotlight search option.

Step 2: From the Disk Utility main menu, choose View, then Show All Devices.

Step 3. Select the disk that you want to start your Mac from. It should be named “Macintosh HD” or something similar.

Step 4: Click the “First Aid” button, and then click “Run” to scan for problems on the selected disk.

If asked, enter the administrator password to unlock the disk.

Step 6: When the scan is complete, Disk Utility displays a report listing any problems it found and what it fixed.

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Solution 2: Start Apple Diagnostics

Second, you can run Apple Diagnostics to address the volume hash mismatch issue. This tool scans your Mac for physical problems, such as a failing hard drive, memory, or logic board.

To start Apple Diagnostics, follow these steps:

Step 1: Restart your Mac, and then press the D key before you see the progress bar or the language selection window.

Step 2: Release the D key when prompted.

Step 3: Apple Diagnostics will check your Mac immediately. This might take a few minutes.

If any problems are detected, they will appear in the remaining results, along with an error code and guidance on how to fix them.

Solution 3: Clean install macOS

Reinstalling macOS is the third option. You'll need to erase your drive and install a fresh copy of macOS. This can fix a volume hash mismatch by eliminating damaged or incompatible system files or apps.

Follow these steps:

Step 1: Turn off your Mac and plug it in.

Step 2: Turn on your Mac and start it up in macOS Recovery Mode by holding down the Command+R keys.

Step 3. In the macOS Utilities window, look for the "Disk Utility" option and select it. Next, click "Continue" to proceed with the necessary actions.

Step 4: With the startup disk selected on the left, choose “Erase” from the Disk Utility toolbar.

Step 5: Give your disk a name in the “Name” field, then choose APFS from the “Format” pop-up menu (if you're using an older Mac, choose “Mac OS Extended”). Finally, click the “Erase Volume Group” button.

Step Six: When it's done, click “Finish,” then choose “Disk Utility” and “Quit Disk Utility.”

In the macOS Utilities window, choose Reinstall macOS, then click Continue.

Step 8: Follow the on-screen instructions to select your disk and begin the installation process.

Step 9: Wait for the installation to finish. Your Mac might restart several times during this process.

After installation, users should use the Setup Assistant to set up their Mac.

Note: Cleaning and reinstalling macOS erases all of your personal information and settings, so back up your Mac first.

Solution 4: Downgrade macOS to the previous version

If the volume hash mismatch issue appeared after upgrading macOS, you should downgrade to the previous version. Sometimes, a file is incompatible with the latest macOS version. Downgrading to the latest stable macOS version might resolve this issue.

The process is similar to reinstalling macOS, except that instead of erasing and restoring the current version, you'll erase and revert to the previous one.

The only difference is that you don't have to wait as long for the downgrade to finish as you would with a clean install. Follow the instructions on the linked page to downgrade your version of macOS.

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Solution 5: Reset the SMC and NVRAM

Security on your Mac is protected by the System Management Controller (SMC) and Non-Volatile Random-Access Memory (NVRAM).

The System Management Controller (SMC) is a microprocessor that manages power resources on your Mac (like the battery). However, your Mac's NVRAM (Non-Volatile Random-Access Memory) stores data like volume and display settings that get loaded before the operating system starts up. Resetting both the SMC and the NVRAM will resolve any volume hash mismatch issues.

How to Reset the SMC and NVRAM on a Mac:

Step 1: Turn off your Mac and unplug all external devices except for your keyboard, mouse, and display.

Step 2: If your MacBook has an integrated battery, press and hold the Shift, Control, and Option keys on the left side of the keyboard along with the Power button for about 10 seconds. Release all keys, then press the power button again to start up your Mac.

Step 3: If your Mac has a removable battery, remove it, and then hold down the power button for five seconds. Replace the battery and turn on your Mac. This should fix the problem.

Solution 6: Clear the Disk Cache

The last method is to clear the cache on your Mac's drive. Caches on your Mac can speed up tasks like opening files, launching apps, and browsing the web, but they can also take up a lot of space on your hard drive and should be cleared more frequently.

Here's how to clear the disk cache on your Mac:

Step 1: In Finder, choose "Go" from the menu bar. Then select "Folder."

Step 2: Press Enter after typing ~/Library/Caches. This will open the folder that contains your cache files.

Step three: Press Command-A to select all the files in the folder, right-click, and choose “Move to Trash.”

Step four: Click the Trash icon in the Dock, and then choose Empty Trash from the menu bar.

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Recover macOS Data from a Failed Volume

As a Mac user, you may have encountered issues with your Mac drive failing to start up properly. You might see messages like “Disk Utility can't repair this disk” or “Volume not mounted,” and sometimes the Mac won't start up at all. To fix this, you might need to erase and reinstall macOS, which can result in the loss of your valuable data.

However, you can use the Data Recovery Wizard for Mac tool to recover your data. It's an application designed for macOS that can retrieve and restore data from corrupted files. It scans your hard drive to find deleted photos, movies, documents, emails, and other files. Here are some features that set Data Recovery Wizard apart from other apps:

Main Features

• ✔️It can retrieve accidentally deleted, partially lost, or information from unmounted disks.
• ✔️It features both quick and comprehensive scanning abilities. The quick scan locates items swiftly and accurately, while the sector-by-sector search uncovers new entries.
• ✔️The tool prevents data overwriting. This stops data loss and ensures successful recovery.
• ✔️It can recover unsaved documents on a Mac, such as files stored on Dropbox, Google Drive, OneDrive, and other cloud storage platforms. This saves storage space and allows you to access your files from anywhere.

Step 1: Scan the RAID array for lost data

Select the partition of the Fusion Drive where you lost data and files. Click on the “Search Lost Files” button. If you are not sure which partition is the Fusion Drive, click on the “Search from Disk” link text to check the partition name.

Note: Before data recovery, it's recommended that you click “Disk Backup” from the left sidebar and create a backup of your Fusion disk to prevent further data loss. After backing up the Fusion disk, the software can recover data from the Fusion disk backup and use it again.

Step 2: Look for the Lost Files after Scanning

“Data Recovery Wizard for Mac” immediately scans your Fusion disk partition and displays the scan results. You can filter files by type and path.

Step 3: Recover files from Fusion Drive

From the scan results, select the files you want to preview. Then, hit the “Recover” button to get them back.

Closing remarks

In conclusion, we have seen the “Checksum Mismatch” issue, its sources, and the solutions. The problem could be due to hard disk issues or encoding information. However, you can resolve it quite easily.

Ensure your data is safe, and should any issues arise, consider using a Mac Data Recovery Wizard. This software can help you retrieve precious digital assets.

FAQ: Volume Hash Mismatch

Here are four additional questions about the volume hash mismatch issue. You can find the answers here.

1. What is a Hash Mismatch Error? A Hash Mismatch Error typically occurs when the hash value of a local file does not match the expected hash value on a server during software updates, program verification, or file checksum processes. A hash is an algorithm that converts any length of data into a fixed-length output, often used to verify data integrity and consistency. When your system reports a "Hash Mismatch Error," it might indicate one of the following issues: - File corruption: The file might be incomplete due to network issues during the download process. - Incorrect update: The software update might not have been applied correctly, or you could be using an incompatible version. - Malware or viruses: Malicious software may have altered the file, causing the hash value to change. - Server issue: The file on the server might have been modified or not updated properly. To resolve this issue, you can try the following steps: 1. Redownload the file or update: Ensure a stable internet connection and retrieve the file or update from an official source. 2. Check antivirus software: Make sure no antivirus software is blocking or modifying the file. 3. Perform a system restore: If the issue appeared after an update, consider rolling back to a previous state. 4. Contact technical support: If none of these solutions work, you may need to reach out to the software developer or service provider's technical support for assistance.

A Mac error code hash mismatch indicates that your data is corrupted or has been modified. This can lead to application or system failures. You must repair your hard drive or system to resolve this issue.

How do I restart my Mac in Recovery Mode?

On Intel-based Macs, press and hold Command + R until you see the Apple logo to enter Recovery Mode. On newer Macs, you'll need to press and hold the power button until you see the Startup Options screen. From there, click Continue and then Options to enter Recovery Mode.

3. What is the latest Mac operating system?

The latest version of macOS is macOS 13 Ventura, which was released on October 25, 2022, and is now available for download.

How do I open Disk Utility on a Mac? To open Disk Utility on your Mac, follow these steps: 1. Click the Apple menu () in the top-left corner of the screen. 2. Select "Utilities" from the dropdown menu. 3. In the opened "Utilities" window, find and click on "Disk Utility" icon. Alternatively, you can use Spotlight to open Disk Utility: 1. Press the Command (⌘) and Space keys on your keyboard to open Spotlight search. 2. Type "Disk Utility" into the search box and press Enter. 3. The Disk Utility application will then launch. You have now successfully opened Disk Utility on your Mac.

On a Mac, open the “Applications” folder, then open the “Utilities” folder to launch Disk Utility. You can also search for it using Spotlight.