How to recover data from Apple disk image (*.DMG)?

Posted by Katrina to Mac Data Recovery on December 28th, 2018

I have a few folders that I compressed into DMG image data. I was able to open most of them so far with no problems until today when I got a Data Corrupted message. First thing I did was to restore the file from an early Time Machine backup however I still got the same message. I then used Disk Utility to Scan Image for Restore...same error message.

Any suggestions? If nothing works would a data recovery service be able to deal with this problem?

An Apple disk image is a file (usually with the .DMG extension), virtual disk like a CD or DVD or even a hard disk, which stores files in a way that act like storage devices. It is very useful for creating system backups, data recovery, software distribution, data encryption, etc.

However, Apple disk images are fairly robust for the most part, as data in the disk images is prone to be deleted, corrupted or lost. Data corruption in a DMG disk image usually occurs while it is being copied or if someone modified it. Even though the Apple disk images themselves are good and mountable, chances are that you are unable to access data in the disk image. Don’t worry, this brief article explains how to recover data from Apple disk image (*.DMG).

How to recover data from Apple disk image (*.DMG)?

No matter what the reasons behind the loss of DMG files may be, iBoysoft Mac Data Recovery is highly recommended to deal with different data loss situations. It is a free Mac data recovery tool which is designed to restore a disk image on Mac whether it is damaged, lost, deleted or formatted. It enables you to recover data from APFS (including APFS encrypted), HFS+, HFSX, HFS, FAT32, exFAT disk image. With advanced algorithms, iBoysoft Mac Data Recovery scans the storage device and recover DMG files without damaging them.

Apart from data recovery from Apple disk images (.DMG files), this powerful data recovery tool can recover other file formats as well, such as music files, documents, videos, emails and many more from hard disks, external hard drives, USB flash drives, SD cards, memory cards, etc. It is fully compatible with macOS Mojave/High Sierra 10.13/Sierra 10.12/10.11/10.10/10.9/10.8/10.7.

Step-by-step tutorial to recover data from Apple disk images (.DMG files):

Step 1: Free download, install and launch iBoysoft Mac Data Recovery.

Step 2: Click iBoysoft Data Recovery from the top left toolbar, choose "Load Disk Image" and then select "Normal Disk Image" or "Encrypted APFS Disk Image" based on your actual situations.

Recover data from Apple disk images (.DMG files)

Step 3: Select the Apple disk image from which you want to recover lost data and click OK. The program will start scanning the disk image.

Recover data from Apple disk images (.DMG files)

Step 4: During or after the scanning process, you can click the found files and preview.

Recover data from Apple disk images (.DMG files)

Step 5: Choose what you want to get back and click "Recover".

Reasons for data loss on Apple disk image

  • > Accidental deletion of a DMG file from Mac computers.
  • > Mistakenly formatting.
  • > Improper unmounting: A disk images is always considered as a physical disk. So if you try to eject a DMG file in an external devices before the proper process of unmounting, you will cause damages to the DMG file.
  • > Sudden power failure: Sudden power failure will interrupt the current read and write operation to DMG files, which is a possible reason for DMG files corruptions.
  • > Virus attack: Virus and malware ill influence the entire computer system, including files in the Apple disk images.
  • > Physical damage or software issues.

To avoid data loss on an Apple disk image, you should mount and unmount an Apple disk image properly. Try to provide insufficient power to your Mac machine and keep your Mac system in a virus free environment. More importantly, make regular backups and update them in time.

Still have questions?