How to Fix Seagate External Hard Drive Not Mounting on Mac

Are you having trouble with your Seagate external hard drive not mounting on your Mac? In this post, you'll find solutions to fix this issue and get your device up and running smoothly again. Install EaseUS Data Recovery Wizard for Mac to rescue its stored data ASAP!

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When you plug in a Seagate drive to your Mac, the Disk Utility shows that the Seagate external hard drive is not mounting on your Mac, which means you can't access its stored files.

This post will discuss solutions to the error that Seagate's external hard drive is not mounting on Mac and provide effective ways to recover data from the unmountable drive.

Unmounting Seagate External Hard Drive Recovery with Software

When you encounter the challenge of accessing information from a Seagate hard drive on your Mac, such as the common unmounting error " error -119930868", it might feel overwhelming.

However, there's no need to worry - data retrieval software is here to assist you. One reliable option is the EaseUS Data Recovery Wizard for Mac, which can access stored data from the unmountable Seagate hard drive and provides recovery options to help users save the stored files.

This software proves to be valuable due to its scanning process that swiftly and accurately locates lost data. You can even preview all recoverable files on the unmounted Seagate hard drive, including photos, videos, documents, etc. Check out the following steps to perform Seagate file recovery for Mac:

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.

Note: Before data recovery, you'd better click "Disk Backup" from the left sidebar to create a backup of your external hard drive to avoid further data loss. After backing up the external hard drive, the software can recover data from your external hard drive's backup, and you can remove the external hard drive and use it again.

select the external hard drive and click Search for lost files

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.

scan for lost files on external hard drives

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.

recover lost files on external hard drives

Fix Seagate External Hard Drive Not Mounting via Disk Utility

If an external hard drive keeps disconnecting on a Mac, usually, just re-mounting the Seagate hard disk will make it accessible. Usually, when you plug in the external hard drive, the operating system automatically mounts it.

Follow these steps to mount a Seagate hard drive on a Mac manually:

Step 1. Navigate to "Finder > Applications > Utilities" and open "Disk Utility".

open Disk Utility

Step 2. To access the drive that is not currently mounted in Disk Utility, you can right-click on it. Choose the option "Mount" to force mount an external hard drive on a Mac.

mount a disk on Mac

Share this article on social media to help others learn how to fix the error that the Seagate external hard drive does not mount on a Mac.


Repair the Seagate External Hard Drive with Mac First Aid

When you mount the Seagate HD via Disk Utility, mounting errors like " error 0" may occur. In this case, you should run First Aid to fix your unmounted Seagate hand drive.

Step 1. Go to the Launchpad icon on the Dock and locate the Other Option.

Step 2. Search and open "Disk Utility".

Step 3. Choose the unmountable Seagate external hard drive and click "First Aid" at the top. Select "Run" to repair the hard drive.

run First Aid

Step 5. Wait for the First Aid process to complete, click the "Done" button.

If First Aid found corruption that needs to be repaired, you should repair the disk errors by clicking "Repair". Suppose the First Aid process fails. Read this article to solve this problem.

First Aid process has failed

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

This article guides on fixing the error the 'First Aid process has failed' in Disk Utility and what you can do in case you need to recover data. Read more >>

Mount the Unmountable Seagate Hard Drive by Reformating

If none of the above methods worked, consider reformatting the Seagate external hard drive to fix the issue.

Before formatting the Seagate external hard drive, remember to back up your important files elsewhere to avoid any potential data loss.

Below are the steps to follow to achieve that:

Step 1. Connect your hard drive to your Mac and search for "Disk Utility" in the Launchpad.

Step 2. Select your Seagate hard drive and select the "Erase" option.

erase a disk on a Mac

Step 3. Change the hard drive name and pick a format that works with your Mac. After choosing the format, click the "Erase" button. Click "Done".


There are reasons why your Seagate external hard drive may not mounted on your Mac. Fortunately, there are solutions to address this problem. If you encounter the issue of your hard drive not appearing, you can attempt any of the techniques described in the article: clicking the "Mount" button, running "First Aid", and formatting it by clicking the "Erase" button.

In case you experience data loss during the connection process, you have the option to utilize the EaseUS Data Recovery Wizard for Mac to rescue your files.

Seagate External Hard Drive Not Mounting on Mac FAQs

Below are some common inquiries about Seagate's external hard drive failing to connect properly with a Mac.

1. Why won't my Seagate hard drive mount on a Mac?

If your Seagate hard drive isn't mounted on your Mac, make sure to inspect the USB or cable connection, test it on another port, and confirm that the drive is receiving power. Also, check if the drive is visible in Disk Utility. If not, it might have a corrupted file system or be failing. Use Disk Utility to repair or reformat. Consider testing on another computer to isolate the issue.

2. Why is my Seagate hard drive not showing up on my Mac?

There are several reasons why your Seagate hard disk might not show up. Some of these reasons are incompatible drivers, the drive using the wrong format, you've disabled display settings, etc.

To resolve this problem, attempt reconnecting the drive, updating the software utilizing Disk Utility, or formatting the disk.

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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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