How to fix Seagate external hard drive not readable on Mac?

By Katrina | Posted to Mac Data Recovery, updated on June 5th, 2019 |

Summary: When connecting your Seagate external hard drive to your Mac, you may receive the error message "The disk you inserted was not readable by this computer." Don't know how to repair this disk error? Just recover data from this Seagate external hard drive with iBoysoft Mac Data Recovery and then fix this unreadable external hard drive without data loss.

Seagate external hard drives share a good reputation for their admirable capacity, speed and price. But it is common that hard drives from WD, Toshiba, Seagate, or any other brand become unreadable, with a message "The disk you inserted was not readable by this computer" popping up. What to do when Mac is not reading the Seagate external hard drive? This article will show you how to recover from unreadable Seagate external hard drives and how to fix the Seagate external hard drive not readable on Mac.

Table of contents
1. Why Seagate external hard drives become unreadable?
2. How to fix Seagate external hard drive not readable issue on Mac?
3. How to recover data from unreadable Seagate external hard drives on Mac?

Why Seagate external hard drives become unreadable on Mac

Seagate external hard drive was not readable on Mac

When you see the error message above, you may be wondering why your Seagate external hard drive becomes unreadable on your Mac all of a sudden. As a matter of fact, the Seagate external hard drive not working issue can be caused by various reasons, and the following are some common ones.

  • Hardware issue like broken USB port or USB cable
  • Software problems such as outdated disk driver, malware attacks
  • Hard disk errors like disk corruption, damaged file system, corrupted directory, bad sectors, etc.
  • Human negligence power outage, improper ejection, physical damage to the Seagate externa hard drive, and other wrong behaviors.

Which one to choose: Initialize, Ignore, or Eject?

Usually, the error message will followed with three options - Initialize, Ignore, and Eject. But which one to choose in this case? You may be at a loss just like the user below.

I never had a problem with my Seagate Backup Plus Desktop external hard drive for Mac until now. I connected it to my Mac but it keeps saying "The disk you inserted was not readable by this computer". I have options to initialize, ignore, and reject. I don't know what they are used for and how can I fix this disk failure. I don't want to lose my important files on this external hard drive, any suggestion? Thanks in advance.

The options "Ignore" and "Eject" are pretty easy to understand, but what does "Initialize" do? What will happen if you click this button? Actually, clicking "Initialize" will open a built-in tool called Disk Utility, which is designed for repair and manage disk connected to your Mac.

Therefore, you can just eject this drive, reconnect it to your Mac, and see if this Seagate external hard drive is not readable by your Mac still. You can ignore this message if you got some fixes to deal with this unreadable external hard drive. Or you can click on "Initialize" to repair this drive in Disk Utility if you're familiar with this disk tool.

How to fix Seagate external hard drive not readable issue on Mac?

There are five ways to fix Seagate external hard drive not readable issue on Mac in accordance with different situations. You can check them one by one if you don't know what make your external hard drive unreadable exactly.

Solution 1: Eject and reinsert the Seagate external hard drive

The first attempt is to remove the Seagate external hard drive and then reconnect it to a different USB port or Mac, in that a faulty USB port, broken USB cable, or malfunctioned Mac could be the troublemaker.

Solution 2: Check for driver update

The next solution is to check the driver. Sometimes, outdated drivers could be the reason that a Mac is not able to recognize external drives. You can simply check if there any driver update is available in App Store, if so, just update it with instructions in the context screen.

update Seagate external hard disk driver on Mac

Solution 3: Repair the unreadable Seagate external hard drive with Disk Utility

First Aid in Disk Utility is a useful tool to check and verify disk errors on macOS. If your Seagate external hard drive is not readable by this computer, you can try running First Aid to check and repair this external hard drive..

Step 1: Go to Utilities and launch Disk Utility.

Step 2: Choose the Seagate external hard drive from the left sidebar.

Step 3: Click the "First Aid" tab on the top.

Step 4: Click "Run" to repair this unreadable Seagate external hard drive.

repair Seagate external hard drive with First Aid

Solution 4: Reformat the unreadable Seagate external hard drive

If First Aid fails on the external hard drive, the drive may have some serious file system problems. You can reformat the Seagate external hard drive for reuse, giving it a new file system.

Warning: Reformatting will erase this drive and delete files on this Seagate external hard drive. Make sure you have recovered files from this drive with iBoysoft Mac Data Recovery.

Step 1: Go to Utilities and open Disk Utility.

Step 2: Choose "Show all devices" in View option to list your Seagate external hard drive in the left sidebar.

Step 3: Select this external hard drive and click "Erase" at the top center of Disk Utility.

Step 4: Complete the related information (name, format, scheme) and click "Erase" to reformat this drive.

Solution 5: Ask Professionals for Help

Nevertheless, factors like bad sectors, accidental dropping, water wash, etc. will physically damage your Seagate external hard drive. In this case, your files on this drive can't be recovered by hard drive data recovery software. You're strongly advised to take recourse to specialists and see if they can repair your unreadable Seagate external hard drive.

How to recover data from unreadable Seagate external hard drives on Mac?

You may know that if your photos or other files on this Seagate external hard drive were overwritten due to improper operations, it is hard to say whether you can recover these files or not. Thus, for whatever reason the Seagate external hard not readable issue may occur, it is important to recover your important files on this drive firstly, in case that these files are deleted from this Seagate hard drive or overwritten by accident.

What is the best external hard drive data recovery software?

Believe it or not, recovering data from Seagate external hard drive is rather simple as long as you find the right software for hard drive data recovery.

iBoysoft Mac Data Recovery is such a free external hard drive data recovery software, which can recover data from external hard drives of WD, Toshiba, Seagate, Samsung, etc. Even though the external hard drive is corrupted, unreadable, unmountable or formatted for some reasons, this powerful software can recover files from these drives still. Moreover, it can recover photos, emails, videos, audio files, documents, etc. from external hard drives. The utility supports data recovery from macOS 10.14 (Mojave), macOS 10.13 (High Sierra), macOS 10.12 (Sierra) and Mac OS X 10.11 (El Capitan), 10.10 (Yosemite), 10.9 (Mavericks), 10.8 (Mountain Lion), 10.7 (Lion)

Besides, iBoysoft Mac Data Recovery performs well in data recovery from external hard drives, hard drives, SD cards, memory cards, USB flash drives, thumb drives, CF cards, etc. This program can also undeleted files from emptied Trash on Mac.

Tutorial to recover data from the unreadable Seagate external hard drive

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

Step 2: Connect the Seagate external hard drive to your Mac and launch aunch iBoysoft Mac Data Recovery.

Recover data from unreadable Seagate external hard drive on Mac

Step 3: Select the unreadable Seagate external hard drive and click "Next" button to scan for all the lost data.

Step 4: Preview the searching results, choose files you need, and click "Recover" to get them back.

Preview files on Seagate external hard drive on Mac

Bottom line

This post has summarized almost all feasible solutions for users who have got headache on Seagate external hard drive not readable issue. To avoid this kind of unnecessary trouble, you need to pay more attention to the operation you have made during the usage. What's more? If some accidents happen and lead to data loss, you should stop using this device and run iBoysoft Mac Data Recovery to get lost data back.

Katrina

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

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