How to fix external drive not readable by this computer on macOS Catalina/Mojave/High Sierra?

By Katrina | Posted to Mac Data Recovery on October 22nd, 2018 |

Have you encountered the error message: "The disk you inserted is not readable by this computer" when plugging in your Seagate/WD external hard drive? Worried about the data? Just download iBoysoft Mac Data Recovery to recover data from unreadable external drive and then follow the below steps to fix external drive not readable by this computer.

There are times when you connect your Seagate/WD external hard drive to Catalina/Mojave/High Sierra to copy some files but end up getting an error message - 'The disk you inserted was not readable by this computer'. Actually this error message is common that usually happens to external hard drives, USB flash drives, SD card, memory card, etc.

If the external drive not readable error happens, you'll be unable to access files in the external drive. Then, how to fix external drive not readable by this computer?

External drive not readable by this computer

How to fix external drive not readable by this computer?

Whatever the specific reason can be, the most important thing is to fix external drive not readable by this computer.

Solution 1: Eject and re-insert the external drive

The first simple attempt is to remove the external drive and then replug it on your Mac computer. If the external drive is still not readable, you can move on the other method.

Solution 2: Check the Mac system

Try to insert a different external drive to your Mac computer, if the drive appears in Finder, your Mac computer has no problem.

Solution 3: Update Mac drivers

Maybe the driver on Mac is out of date, so the external drive is not supporting. You can attempt to verify, update or reinstall the outdated driver.

Solution 4: Fix external drive unreadable Mac with Disk Utility

Step 1: Launch Disk Utility.

Step 2: Choose the unreadable external drive on the left sidebar.

Step 3: Select First Aid in the top center and click Run.

Solution 5: Initialize the unreadable external drive and recover data

If Disk Utility can't repair the disk, your external drive may have some serious file system corruptions. In this situation, reformatting is a viable option. However, reformatting will erase all the data stored on the external drive, so make sure that you have made backup. Forget to back up? Just use the professional data recovery software to recover data from unreadable external drive on Mac.

Step 1: Recover data from unreadable external drive

iBoysoft Mac Data Recovery is free Mac data recovery tool to recover data from unreadable external hard drives, USB flash drives, hard drives, SD cards, memory cards, Pen drives, etc. Besides, it can also recover data from unmountable drives, recover data from formatted drives, recover data from inaccessible drives on macOS 10.15/10.14/10.13/10.12 and OS X 10.11/10.10/10.9/10.8/10.7.

Tutorial to recover data from unreadable external drive on Mac with iBoysoft Mac Data Recovery

1. Download and install iBoysoft Mac Data Recovery on Mac.

2. Launch iBoysoft Mac Data Recovery.

Recover data from unreadable external drive with iBoysoft

3. Select the unreadable external drive and click "Next" button to scan all lost data.

4. Preview the searching results, choose files we need, and click "Recover" to restore files.

5. Have a check to ensure we have got all lost data back.

Solution 2: Initialize the unreadable external drive

After successfully recovered all lost data, we can fix external drive not readable by formatting it as the steps below without worrying about losing data.

Step 1: Launch Disk Utility from Utilities.

Step 2: Click the icon of unreadable external drive on the left part of the window.

Step 3: Click the Erase function on the top of the Disk Utility window.

Step 4: Complete the related information (name, format, scheme), then click Erase button.

Factors that lead external drive not readable by this computer

To be honest, there are various reasons why drive not readable by this computer, including faulty connection, or drive corruption. However, the most common reason is drive/file directory corruption. And this can be caused by the following reasons:
> Improper eject
> Force system Restart
> Incorrect operation
> Internal file system error
> Virus attack or malware
> Windows Registry Problems
> Sudden Power failure or outage

Katrina

Katrina is a data recovery expert @iBoysoft who loves to help readers solve various data recovery problems.

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