Questions tagged [disk-image]

A file with the .dmg extension, often used for installing applications.

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How do I remove a disk image that I created myself?

I went to disk utility and created a new image with 1.5 GB of my hard disk. Now I want to remove it and have all the space back for my Macintosh HD. Nothing seems to work. If I eject it, it's not ...
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1answer
155 views

“Create disk image” disabled

My 2015 MacBook Pro has become unbootable after software update for 10.14.5 failed to install. Because I do not have a recent backup, I would like to create a disk image of the entire boot disk. ...
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2answers
157 views

How long does it take to convert a cdr to an iso? [closed]

I ran the command sudo dd if=/dev/disk# of=/Volumes/Path/To.iso at about 6am this morning. It's now almost 2pm and the command is still running. The cdr input image is about 300GBs. I have a Late ...
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1answer
253 views

Using dd to image a corrupted Windows disk?

What is the proper way to use dd (or anything else - asr?) to create an image of a corrupted yet readable Windows disk? If what I am using (see below) is correct, then is it possible that an image of ...
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0answers
49 views

create image of the disk in recovery mode

My disk won't mount and I can access it only via recovery mode. I have backed up some important data on a USB, but now I would like to ask how to create an image of the disk in recovery mode (using ...
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1answer
5k views

What does a .dmg verify?

Whenever I open a .dmg, my computer says that it is Verifying… for a moment. I'm just curious as to what it is doing at this time. Is it running a checksum, checking if it is the same as the online ...
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2answers
113 views

How can I stop DiskUtilities from requesting permission every time I try to create an image from a CD

I have a big stack of CDs from the 90s that I want to keep the data from, but don't want the physical CD anymore. So I'm using Disk Utility to create the disk images. Every time I do (by right-...
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2answers
1k views

Unable to eject disk images or drives in High Sierra

I am running a MacBook Pro Early 2015 13" on High Sierra 10.13.5, and keep getting the "X disk cannot be ejected because one or more programs might be using it" message, when apparently there is no ...
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2answers
2k views

Create disk image which can be read on Windows

I am interested in creating a disk image, using Disk Utility (or any other software) on macOS which can also be read on Windows. Disk Utility provides the ability to create .dmg, .sparseimage, and ....
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1answer
3k views

macOS High Sierra 17G2112 vs 17G65

I was trying to use installinstallmacos.py to create an installer disk image for High Sierra 10.13.6 (I need an offline installer and downloading from App Store only downloads a ~4MiB stub file with ...
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1answer
122 views

See a log of all DMG files that were mounted

Today I saw for a very brief moment (like a fraction of a second) an alert telling me that some “BaseSystem.dmg” file was being mounted, even though I wasn’t trying to mount anything, nevertheless a ...
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1answer
413 views

Recover data in Sparsebundle disk Image

I'm afraid I'm out of luck but... I followed the directions in various places, # hdiutil -nomount -noverify -noautofsck SecureRecords.sparsebundle /dev/disk1 # fsck_hfs -drfy /dev/disk1 ...
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MacBook Air High Sierra disk image not recognised couldn't open

I created a disk image from a folder using disk utility and now when I double click it to open it i get an error message saying image couldn't be opened. Image not recognised. What can I do?
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1answer
2k views

Is a Sparse Bundle image or Sparse Image better for many files 3 TB external hard drive 4TB?

I'm on a Mac and Windows PC, and have many files (videos, photos, documents, iTunes Backups, but without Windows or macOS system backup) the size is 3TB or larger in my old external hard drive. I use ...
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1answer
3k views

How to Mount a Sparsebundle Disk Image from Time Machine Backup?

I have several sparse bundle disk images on my system, used for various purposes (mostly to prevent Time Machine from backing up the entirety of very large files). However, I'm planning to ...