How to recover unmountable hard drive on Mac?

Posted by Juno to Mac Data Recovery on August 15th, 2017

When I booted up my Mac, I got an error that reads unmountable boot volume. Then I can't access the volume but I have plenty of important files on it. How can I recover unmountable hard drive on Mac as well as data inside it?

Hard drive is a basic part of a computer that stores various data. It is usually divided into several logical volumes, like system files, application files and user files. In this way, we can manage those volumes separately, store and access data easily. When we boot up a Mac, the macOS mounts all volumes according to their file system. What should be noted is that only after the hard drive volumes have been properly mounted, macOS can gather all information about the corresponding drives and we can access data on the volumes.

However, sometimes there are some unpredictable errors happen to Mac volume, and then the volume becomes unmountable and data inside can't be accessed any more. The most common reasons that cause unmountable hard drive are: file system corruption, volume header corruption, catalogue file corruption, malfunction of macOS, malware attack.

When our Mac hard drive becomes unmountable, we are very possible to suffer heavy loss of significant files, such as precious photos, working documents, important emails. Under that condition, we must be eager to know how to recover unmountable hard drive on Mac as well as files inside.

Repair unmountable hard drive with Disk Utility - not recommended

The first method comes to the mind of some users is to recover unmountable hard drive with Disk Utility. Disk Utility has a built-in function called First Aid, with which we can check the volume errors and try to repair those errors. But actually First Aid is not really recommended, not only because it fails to repair errors sometimes but also because it may damage the data inside and make data unrecoverable.

Best method to recover unmountable hard drive on Mac

The best and most safe way is to recover data from unmountable hard drive and then format the unmountable hard drive. At the first step, free Mac data recovery software - iBoysoft Mac Data Recovery is needed.

Step 1: recover data from unmountable hard drive with iBoysoft Mac Data Recovery

iBoysoft Mac Data Recovery is a free Mac data recovery software that can recover data from unmountable hard drive, recover data from unmountable external hard drive, recover data from unmountable USB flash drive, memory card, recover data from formatted, inaccessible, unreadable hard drive, external hard drive, SD card, USB drive, recover deleted files emptied from Mac Trash, etc. on macOS 10.13/10.12 and macOS 10.11/10.10/10.9/10.8/10.7/10.6.

Download iBoysoft Data Recovery

Follow the steps below to recover data from unmountable hard drive on Mac:

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

2. Launch iBoysoft Mac Data Recovery.

recover unmountable hard drive on Mac

3. Select the unmountable hard drive and click "Next" button to scan all lost files.

4. Preview the scanning results, choose files we need, and click "Recover" button to get them back.

Step 2: Format the unmountable hard drive

After successfully recovering data from unmountable hard drive, we can repair the unmountable hard drive by formatting.

1. Launch Disk Utility.

2. Click the icon of the unmountable hard drive on the left part of the window.

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

4. Complete related information, like name, format, scheme, then click Erase button.

For recovering data from failed hard drive on Mac, please refer to Mac hard drive failure recovery.

Still have questions?

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