[Solved!] Could Not Mount Disk After Erase? 4 Ways to Fix This Error

Have you ever encountered a situation where your Mac can't mount a disk successfully after formatting? Some Mac users reported in several forums that they received an error message saying: "Could not mount disk after erase. Invalid disk. Operation failed..."

Don't worry if you have the same confusion! This post will introduce effective ways to solve the "Could not mount disk after erase" issue and provide a powerful disk repair tool that helps you rescue data on the unmountable disk!

Could Not Mount Disk After Erase? Possible Causes

Many reasons can lead to a disk being unable to be mounted on a Mac, such as the "com.apple.DiskManagement.disenter" issues. In this case, you may receive an error message like "Could not mount a disk[name]. (com.apple.DiskManagement.disenter error -119930868)" or other mount error codes. This error indicates there's a mounting error between your Mac and disk, including:

Hard Drive Errors:	Mac Issues:
📁Corrupted file system	❌Incompatible software installations
❎Incompatible with macOS	😰System bugs after updating
🔌Not appropriately ejected last time	⛔Improper permissions & security settings
💾Insufficient storage space	⚠️FSCK program stuck

How to Fix 'Could Not Mount Disk After Erase'

Is it possible to fix the "Could not mount disk after erase" error on your Mac? Of course, YES! Here are different effective solutions to fix this mount error:

• Fix 1. Reformat Your Disk
• Fix 2. Run First Aid in Disk Utility
• Fix 3. Repair the Unmountable Error via Terminal
• Fix 4. Stop the FSCK Process

✅	Recommendation:
	Backing up your hard disk data and formatting it directly is the most effective and hassle-free solution to the "Could not mount disk after erase" issue. However, if you don't have any important data on your hard disk, consider formatting it directly.

Fix 1. Reformat Your Disk

The most effective option to solve the "Could not mount disk" issue is to format the hard drive. Here are the steps:

Step 1. Open "Disk Utility" and find the disk. If an internal or external hard drive is not showing up on a Mac, click "Show All Devices".

Step 2. Choose the unmounted hard disk, and click the "Erase" button at the top menu.

Step 3. Select any macOS-compatible file system format to the formatted hard drive, and click "Erase" to start the formatting process.

Don't know which file system is better for macOS? This article may tell you the answer!

Fix 2. Run First Aid in Disk Utility

Mac First Aid allows users to repair disk errors with one click. Here's how to fix the unmountable disk to solve the mount error:

Step 1. Open "Disk Utility" from "Applications > Utilities" or type Disk Utility in the search box to locate it.

Step 2. Choose the disk with the "Could not mount" error and click "First Aid > Run".

You can repeat this process three or four times to successfully repair disk errors. If the First Aid process fails, and you still can't access the unmountable hard drive, consider advanced methods in the next part!

Fix 3. Repair the Unmountable Error via Terminal

You can manually mount a disk on a Mac via a command in the Terminal app:

Step 1. Launch Terminal from the "Finder > Applications > Utilities" folder.

Step 2. Type the command diskutil list to find the disk identifier of your unmountable disk.

Step 2. Enter the command diskutil mount /dev/disk1s2, and replace the "disk1s2" with the unmountable disk identifier.

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Fix 4. Stop the FSCK Process

If the unmount error is caused by the incorrect ejecting of the external hard drive last time, killing the FSCK process may solve this error. Open the "Terminal" app and enter the command line sudo pkill -f fsck, which can stop the FSCK process.

Or, you can quit the FSCK process via Activity Monitor:

Step 1. Navigate to "Finder > Applications > Utilities > Activity Monitor".

Step 2. Find the FSCK process in the Activity Monitor window, and hit the "Quit" button to stop it.

Bonus Tip: Can I Restore Data After Erasing a Disk

Sometimes, common mount errors occur on a Mac when you insert an external disk, such as com.apple.DiskManagement.disenter error 0 and com.apple.DiskManagement.disenter error 49244.

In this case, recovering data from the unmountable drive on your Mac to avoid data loss on your disk is essential. Download the powerful and trusted hard drive recovery software to restore your data quickly and safely!

EaseUS Data Recovery Wizard for Mac can help you recover stored data on an unmounted disk, which is not mounting due to disk error, system crashes, corrupted file system, and other common errors. Check out the following steps:

Step 1. Search for lost files

Correctly connect your external hard drive to your Mac. Launch EaseUS Data Recovery Wizard for Mac, and select the external hard drive. Then, click "Search for lost files" to find lost/deleted files on your external devices.

Step 2. Filter and find lost files

After the scan, all file types will be presented in the left panel. Select the file type to find wanted files on your external devices.

Step 3. Preview and recover

Click the file and preview it. Then, select the files you want to recover and click the "Recover" button. You can save your data to local and cloud drives.

Conclusion

This post introduces four effective solutions to fix the "Could not mount disk after erase" error on a Mac, including reformating the disk, running the First Aid process in Disk Utility, using the Terminal command line, and stopping the FSCK process. If the disk stores important data, consider installing a professional and powerful disk recovery tool, EaseUS Data Recovery Wizard for Mac, to restore your data before the repair process.

Could Not Mount Disk After Erase FAQs

Here are questions related to "Could not mount disk after erase" that people frequently ask; check out to learn more about the mount issues!

1. How do you fix the disk0s2 not mounting error on a Mac?

Here are effective ways to fix the disk0s2 not mounting error on a Mac:

1. Fix 1. Repair disk0s2 with First Aid in Disk Utility
2. Fix 2. Use the diskutil Command to Fix the Unmounted disk0s2
3. Fix 3. Boot Your Mac in Safe Mode
4. Fix 4. Erase disk0s2 and Reinstall macOS on Your Mac

2. Why does my hard drive say not mounted?

It can happen for various reasons, such as drive corruption, damaged connectors, wrong drive format, or disabled display settings. Fortunately, numerous ways exist to fix this problem, such as manually mounting your external hard drive on your Mac via Disk Utility or command line.

3. How do I mount a disc that won't mount a Mac?

Through Disk Utility, you can manually force-mount an external hard drive on your Mac. Launch Disk Utility (Finder > Applications > Utilities), select your drive or drive volume and click the "Mount" button.