How to recover files from Macintosh HD.dmg?

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bingham2023 Author

Level 1

4 points

How to recover files from Macintosh HD.dmg?

There seems some problem with my old 13inch Macbook pro which bought at 2010, the OS is still the OS that I bought it at 2010. and some message showed I need update the OS, So I updated the OS, but I could not enter the OS successfully. I tried disk Utility First Aid, but no change. So I thought re-install the OS.

Before I re-install my Mac OS, I made the whole HDD to image file(Macintosh HD.dmg).the dmg file is about 450GB.

After the re-intall was over, I could not open the Macintosh HD.dmg file by several method.

・The restore function of Dis Utiliy

・The UUByte DMG Editor for Windows (there was error when release the dmg file(so big?

)

Could anyone tell me how can I recover the files from the big dmg file?

Not all files is OK, just important photos and video, and some documents.

Thanks very much.

If there is any question about above details, welcome to contact me!

MacBook Pro 13″

Posted on Sep 3, 2023 8:16 PM

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Answer 1

Sep 4, 2023 5:15 AM in response to bingham2023

I don't suppose you had a time machine back up running before it crashed did you?

If so, you can restore from there.

Restoring from a damaged .dmg file is a challenge but here are some thoughts:

There are a few possible ways to recover data from a damaged DMG file on a Mac. Here are some of them:

Use Disk Utility to repair the disk image or convert it to an ISO format 1.
Use hdiutil command to attach or mount the disk image with options to ignore bad checksums or read-write mode 1.
Use Time Machine to restore the disk image from a previous backup2.

Use a professional data recovery software such as Stellar Data Recovery Professional or iBeesoft Data Recovery for Mac to scan and recover the lost or corrupted DMG files2 3 4.

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Answer 2

Sep 4, 2023 4:35 AM in response to bingham2023

You should be able to just double-click the .dmg file!

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Answer 3

bingham2023 Author

Level 1

4 points

Sep 4, 2023 4:55 AM in response to The_Knowledge_Seeker

Oh, no kidding(laugh)!

I can not load the dmg file by Mac. Seems the dmg file was damaged. As I mentioned above, I made the image after I can not enter into the OS.

I had tried several methods that still failed.

maybe some ideas can find here.

Still thanks U very much!

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Answer 4

bingham2023 Author

Level 1

4 points

Sep 27, 2023 5:18 PM in response to The_Knowledge_Seeker

Sorry to feedback late.

I had used the Stellar Data Recovery to deep scan the HDD. Some of the Documents and photos/Videos were got back. But some photos and almost all videos are broken and can't be opened.

So I tried the hdiutil command by below which searched by internet.

hdiutil attach "DMG File" -readonly -noverify -noautofsck

But still feedback there is Error as below

"no mountable file system"

Could you teach me about how to use hdiutil to mound the DMG File?

Or some advice ?

I think that I will try to use Disk Utility to convert it to ISO format to check if I can open the DMG fies.

Now I need a new bigger HDD or SSD to save the ISO format.

And If I convert the DMG file to Read/write disk image, mean I can open the file to copy out the files I wanted ?

Thanks your advice and feedback.

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Answer 5

bingham2023 Author

Level 1

4 points

Sep 4, 2023 10:48 PM in response to The_Knowledge_Seeker

Thanks your reply very much!

U are right, there is no Time Machine backup.

I will follow your advice to try one by one. If any new information or questions , I will feedback to U.

Thanks.

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How to recover files from Macintosh HD.dmg?

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