How to fix/repair corrupted external hard drives on Mac?

By Juno | Posted to Mac Data Recovery , updated on August 15th, 2019 |

Summary: This is a guide to fix external hard drive corrupted issue for you, and it talks about how to recover data from a corrupted external drive and iBoysoft Mac Data Recovery, the best corrupted external hard drive data recovery software.

Hello, I have a problem with my external hard drive. When I plug it into my Mac, it takes too long to acknowledge the drive and files can't be opened at all. I tried to reformat my external hard drive but it says reformat unsuccessful. Any suggestion on how to fix corrupted external hard drives on Mac?

External hard drives are usually used to back up a large amount of data or to extend the capacity of our computers. Most of the time, your Mac computer will recognize the external hard drive once you plug it into the USB port, and the external hard drive will be automatically mounted so that you can access data on this drive. Sometimes, however, things will not proceed smoothly without a hitch. Your external hard drives may just corrupt on your Mac computer, being unrecognizable or inaccessible. Once that happens, you will lose access to the files stored on the corrupted external hard drive. It's such an annoyance especially when you don't have a copy of data backup while data on this external hard drive is especially important to you.

Don't worry. Let's check out the crux of external hard drive corruption and learn how to fix or repair corrupted external hard drives on Mac in case of losing any significant data.

Table of contents
1. Why you external hard drives is corrupted?
2. How to fix/repair corrupted external hard drives on Mac?
3. Conclusion

Why you external hard drives is corrupted?

There are various reasons leading to external hard drives corruption, including drives sharing among different platforms, faulty connection, unsafe ejection, interruption during transferring files, hardware malfunction and virus infection, etc. Don't know which is the troublemaker of your external hard drive corruption? Just check the following fixes one by one and you will work it out.

How to fix/repair corrupted external hard drives on Mac?

Fix corrupted external hard drive on Mac

Solution 1: Check if your drive is properly plugged in

Even though it sounds foolish, it could troubleshoot your corrupted external hard drive. Simply plug your external hard drive slowly or quickly into the USB port and see if you can access this drive.

Solution 2: Check if it is a faulty connection

Since the external hard drive is connected through the USB cable and port, it could be corrupted due to a wobbly connection. You can just connect your external hard drive to another USB port or USB cable.

Solution 3: Fix/repair the corrupted external hard drive with Disk Utility

If the connection is not supposed to be blamed and you sure your external hard drive has no hardware problems, it could be a minor file system corruption which could be fixed through Disk Utility. Disk Utility is a built-in utility on Mac to verify and fix basic external hard drives errors, such as multiple apps quit unexpectedly on Mac computer, a file is corrupted, an external device is corrupted or doesn't work properly, or your computer won't start up, etc.

1. Go to Utilities > Disk Utility.

2. Select the corrupted external hard drive from the sidebar.

3. Click First Aid on the top of Disk Utility window. It may take a while to fix the errors.

First aid corrupted external hard drive on Mac

Solution 4: Fix/repair the corrupted external hard drive by reformatting

If Disk Utility failed to fix the corrupted external hard drive for you, the file system of your external hard drive could be seriously corrupted and need to be reformatted with a new file system. In some ways, reformatting is able to fix your external drive corruption issue but from another perspective, reformatting will erase the disk and you will lose your important data. Fortunately, there is a tool called iBoysoft Mac Data Recovery that can recover your data firstly before you reformat this corrupted external hard drive. It's a risk-free way to fix the corrupted external hard drive and you don't have to worry about data loss any more.

iBoysoft Mac Data Recovery is free and reliable Mac data recovery software that can recover data from corrupted external hard drives and recover data from formatted/unreadable/unrecognizable external hard drives. Moreover, this useful tool can undelete files from Trash, recover lost/deleted APFS partition and recover lost data from hard drives, USB flash drive, memory cards, pen drives, etc. It is compatible with macOS 10.15/10.14/10.13/10.12 and Mac OS X 10.11/10.10/10.9/10.8/10.7.

Follow the steps below to fix the corrupted external hard drive.

Step 1: Recover data from the corrupted external hard drive with iBoysoft Mac Data Recovery.

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

install iBoysoft Mac Data Recovery

2. Connect the corrupted external hard drive to your Mac and launch iBoysoft Mac Data Recovery.

3. Select the corrupted drive and click "Next" to scan for all the lost files.

4. Double-click to preview the scanning results and choose files you want to get back.

5. Click "Recover" and save them to another well-functioned drive.

recover files in corrupted external hard drive

6. Check the recovered files and make sure all the lost files have been restored successfully.

Step 2: Fix the corrupted external hard drive by reformatting.

After successfully recovering data from the corrupted external hard drive, you can fix it by reformatting now.

1. Launch Disk Utility.

2. Select the corrupted external hard drive from the sidebar of the window.

3. Click the Erase button on the top of Disk Utility window.

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

Conclusion

To avoid losing data from corrupted external hard drive, you'd better do yourself a huge favor and make sure your backup strategy is up and running and foolproof. A little pain now will save you a world of hurt in the future. If you have already lost data because of external hard drive corruption, without wishing to pour salt in the wound, recover the lost data with iBoysoft Mac Data Recovery software for good.  

Juno

Juno is a technical expert @iBoysoft. She has over 5-year experience in data recovery/repair technology. She loves to write data recovery tips and tutorials.

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