How to fix external hard drive not working/recognized after power failure on Mac and Windows?

Posted by Katrina to Data Recovery on May 2nd, 2018

I was watching a movie stored on my Seagate Barracuda external HD then I had a power failure in my house and everything turned off. When I tried to turn on my HD again, it made an unusual ticking sound like every second or so, the computer made the usual "USB device plugged in" sound but there was no drive and it wasn't reading it. I tried like 5 times and everything was the same. Any one can tell me how to fix external hard drive not working or recognized after power failure?

When an external hard drive is subjected to power failure, some bad things will happen to both the drive and your computer. External hard drive not working/recognized after power failure is one of the most common problems. If you are troubled by the same or similar issue, all your important files on the external hard drive will be lost. Don't worry, this passage will help you fix external hard drive not working/recognized after power failure.

Fix external hard drive not working/recognized after power failure on Windows

Before fixing external hard drive not working/recognized after power failure, the first thing is to check if the external hard drive can be found in Disk Management.

Scenario: External hard drive can be found in Disk Management

If you are lucky enough, your external hard drive can be seen in Disk Management, that means your PC can recognize the drive. The external hard drive might have logical problem, so some repair tools and data recovery programs are needed. Just follow the below guidance:

Solution 1: Repair the corrupted external hard drive via chkdsk/f command

Step 1: Go to the start menu, type in "cmd" in a search bar, right click "cmd. exe".

Step 2: Type in "chkdsk /X /f drive letter:" or "chkdsk drive letter: /f ", for example, "chkdsk /X /f G:" or "chkdsk G: /f".

Solution 2: Reformat the corrupted external hard drive

Any logical problem can be fixed by reformatting. So you can repair the corrupted external hard drive by reformatting. But reformatting will cause serious data loss issue, so you need a free & professional data recovery program. iBoysoft Data Recovery for Windows is highly recommended.

iBoysoft Data Recovery for Windows is a free data recovery tool for Windows that enables you to recover lost data after power failure on Windows XP/Vista/7/8/10 as well as in Windows Server 2019/2016/2012/2008/2003. Besides, it can also recover deleted/lost files from formatted, RAW, corrupted, inaccessible drive, recover data from deleted or lost partition, etc. It supports recovering data from external hard drive, hard drive, USB flash drive, SD card, memory card, etc.

Step 1: Recover data from external hard drive after power failure on Windows

1. Launch iBoysoft Data Recovery.

2. Select the corrupted external hard drive and click "Next" button to scan all lost data.

Recover data from external hard drive after power failure on Windows

3. Preview the scanning results, choose files you need, and click "Recover" to get them back.

Step 2: Reformat the corrupted external hard drive

1. Go to My Computer (or This PC) or Disk Management, right click the corrupted external hard drive and select "Format" from right-click menu.

2. Set information about format: File system, allocation unit size, volume label, format options (The default format option is Quick Format).

3. Click Start, the format operation will be completed in several minutes.

Fix external hard drive not working/recognized after power failure on Mac

Similar with Windows, when you face external hard drive not working/recognized after power failure on Mac, the first thing is to ensure whether your Mac machine can found the corrupted external hard drive. Just check it in Disk Utility.

Scenario: External hard drive can show up in Disk Utility

If your external hard drive shows up in Disk Utility, your Mac computer can detect your external hard drive that you can leave out the physical damage.

Solution 1: Mount external hard drive in Disk Utility

Sometimes, external hard drives cannot be automatically mounted on Mac, so we can't see it in Finder or Desktop. In this situation, we need to mount external hard drive manually in Disk Utility:

Step 1: Open Disk Utility.

Step 2: Right click the external hard drive from the left sidebar and then click the Mount button.

Solution 2: Repair corrupted external hard drive via First Aid

If the external hard drive is unmountable in Disk Utility, there are some file system errors on the drive. Whenever we meet disk errors, First Aid in Disk Utility is always our first solution.

Step 1: Launch Disk Utility.

Step 2: Choose the grayed out external hard drive.

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

Solution 3: Reformat the corrupted external hard drive

Reformatting is always your last solution as it will erase all data stored on the external hard drive. If you cares about files on the external hard drive, you should recover lost data from corrupted external hard drive on Mac before reformatting.

iBoysoft Data Recovery for Mac is the best free Mac data recovery software that allows you to recover lost documents, pictures, music, videos, emails from external hard drive after power failure, recover deleted files from emptied Mac trash, recover data from formatted, inaccessible, corrupted, unmountable, unreadable external hard drive, hard drive, USB flash drive, SD card, memory card, etc. It is compatible with macOS Moajve 10.14/High Sierra/10.12/10.11/10.10/10.9/10.8/10.7.

Step 1: Recover data from external hard drive after power failure on Mac

1. Launch iBoysoft Mac Data Recovery.

2. Select unmountable external hard drive and click "Next" button to scan all lost data.

Recover data from external hard drive after power failure on Mac

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

Step 1: Reformat the corrupted external hard drive

1. Launch Disk Utility.

2. Select the corrupted external hard drive on the left part of the window.

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

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

Scenario: External hard drive can't be found in Disk Management/Disk Utility

If external hard drive is not showing up in Disk Utility/Disk Management, the drive may have some physical damages, so your PC/Mac can't detect the external hard drive.

Solution 1: Try data recovery software

Sometimes, when the drive can't show up in Disk Management/Disk Utility, it still can be detected by iBoysoft Data Recovery. You can have a try to perform data recovery with iBoysoft Data Recovery.

Solution 2: Send it to a local technician for help

If iBoysoft Data Recovery fails to detect the corrupted external hard drive, it is very possible that the external hard drive has some serious hardware problem, and you need to seek help from a local technician.

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