Questions tagged [disk-image]

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

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Should hdiutil create image from physical or synthesized disk?

When using hdiutil to create a backup image from a terminal in recovery mode (Command-R) hdiutil create -srcdevice /dev/disk3 /Volumes/backups/<name> where disk3 is the "synthesized" ...
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Back up with Time Machine to a Disk Image?

I know that it ignores mounted .dmg by default, so how would one get around this or do variation of this? I know an indirect path would be to make a RAM disk or mount an external disk and copy it over ...
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How do I compress an encrypted time machine disk image?

I have an archived read-only Time Machine drive sitting on a NAS. It is a straight dump (made with dd) of a CoreStorage encrypted HFS+ hard disk. It's taking up 10TB, and I expect that the much of the ...
Glyph's user avatar
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How to make an ISO image of only the Windows (iso9660) track of a hybrid CD-ROM?

I have an old hybrid CD-ROM made of two track : on Windows only the ISO9960 track is visible and mounted, and on macOS only the HFS track is visible and mounted. This is how the CD appears in the ...
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Extract an APFS disk image without mounting it

I have disk image that is reported to have an APFS file system. $ file disk.img disk.img: Apple File System (APFS), blocksize 4096 How can I extract the disk image without mounting it?
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"The operation can't be completed because backup items can't be modified."

How can I delete a folder backed up via Time Machine to a .backupbundle disk image? When I try to delete the folder, I get the error message, "The operation can't be completed because backup ...
Brian Schack's user avatar
-1 votes
3 answers
553 views

What tool can I use to create a partition table on a disk image (.dmg)?

I am trying to port an operating system development project to macOS. The problem here is that the project uses a tool called parted which is only available on linux, not macOS. The parted tool allows ...
Wonixer A's user avatar
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Shrink disk image to eliminate free space

I created a larger-than-necessary writable disk image, copied content to it, then shrunk the partition with diskutil resizeVolume. This left a big gap at the end of the partition table: MEDIA: "&...
rgov's user avatar
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How extract a Time Machine snapshot as a full machine volume?

From an old Time Machine backup (Backups.backupdb folder) on a physical external disk I would like to extract some snapshots to other external disks as complete machine volumes. These resulting ...
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Best type of disk image to use on NAS to archive Mac system copies on a NAS

I bought a shiny new NAS with plenty of space. I also have quit a few old pysical external hard drives with bootable macOS system copies: I always make a copy of my system which I store away when I ...
halloleo's user avatar
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Make image of, and restore iPad Mini flash chip?

Is it possible to make an image of the entire disk of an iPad Mini 1 that’s running iOS 6.1.3 using dd over ssh, for the purpose of backing up and restoration? Additional info below… iPad Mini 2,5 ...
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Setting the size and resizing disk images

In Disk Utility, one can create disk images from arbitrary folders; even encrypting them if you like. However, there doesn't seem to be a way of setting the image size, so once you run out of space, ...
Xophmeister's user avatar
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Computer automatically mounting install disks when plugging in Mini DisplayPort

I have a MacBook Pro 2015 running Mojave. Whenever I plug in a Wacom Cintiq (output VGA converted with a dongle to Mini DisplayPort) my computer mounts a whole bunch of installer images (appear where ...
Caleb Voisine-Addis's user avatar
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Deploy macOS devices with images for employees

In our company, we would like to deploy MacBooks and other Apple devices (e.g. iMacs) via images and make them available to the employees so that we can provide all employees with a uniform system ...
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Is there any way to create a disk image where its Finder window will not display the status bar or tab bar?

I'm trying to create a disk image for distributing an application, where it automatically opens a Finder window in icon view with a custom background. (The sort we see used for many applications.) ...
Bri Bri's user avatar
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Unable to mount encrypted TimeMachine backupbundle using DiskImageMounter

I've been backing up two of my MacBooks to a network-accessible USB disk. The backups have been done using TimeMachine and are encrypted. One of the machines was recently damaged and unrecoverable, ...
larsbutler's user avatar
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macOS: How to read the file system of a disc image

is there terminal command that shows/reads the file system(s) (and versions) of a .iso or .dmg image? E.g. Udf 2.50/Joliet/hfs+
user400439's user avatar
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Backblaze and similar services not necessary for a small hdd? Upload full disk dmg to cloud services easier?

I understand the usefulness and convenience of a site like backblaze, but if I wanted an offline backup and my drive is under 100gb, would it make sense to just make an encrypted full disk dmg image ...
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4 votes
2 answers
8k views

How can you create a valid/reliable disk image of APFS drives?

Last year before Catalina was released, I tried to perform a disk image of my boot drive of Mojave (macOS 10.14) on a new computer before updating and customizing it. I have done this for years to ...
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create file that can be mounted

I am trying to create a bootable filesystem filename.fs from a directory that contains all the OS files. My problem is that I cannot create a file that contains a filesystem. I found a explanation for ...
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Need to get rid of disk image after Bootcamp

So, I was using Bootcamp, but during the point where it asked me to create the partition size, I decided that I no longer wanted to do it anymore and I used the quit option. However, after quitting ...
Shrey Varma's user avatar
2 votes
1 answer
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Disk image creation from folder: error 28 - no space left on device

I wanted to create a full copy of my MacBook Air in a disk image for archive. I can't save the disk from the booted system, so I restarted my Mac in Recovery mode (keys Command and R) on boot. From ...
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How to restore a disk image to source disk using Disk Utility?

I've created a .dmg using Disk Utility from a 32 GB source drive. Now I'm back in Disk Utility in order to restore this disk image to the very same source disk it was created from. I thought it would ...
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Mount Read-only Disk Image Without Breaking Spotlight?

I have a disk image with my main media library inside it, but I normally only mount this as read-only, as this prevents applications from touching anything inside (which can cause a lot of band files ...
Haravikk's user avatar
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How to copy Time Machine directory when rsync can see files but ls can't?

I recently used GNU ddrescue to save a 6TB drive that was having troubles. When I would try to mount the drive, fsck_hfs determined it couldn't be fixed (it was trying to rebuild the catalog b-tree, ...
Andrew Patrick Turner's user avatar
7 votes
4 answers
23k views

How do I skip verification of a .dmg file?

I have downloaded a dmg file but when I click on it it keeps verifying. I've also tried to go to /System/Library/CoreServices/Installer.app but I can't click on the .dmg because it is greyed out. ...
Fe3C's user avatar
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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 ...
akilem's user avatar
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12 votes
3 answers
11k 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. ...
ziggurism's user avatar
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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 ...
Kerlix's user avatar
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2 votes
1 answer
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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 ...
kindzmarauli's user avatar
34 votes
1 answer
7k 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 ...
2br-2b's user avatar
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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-...
Chuck's user avatar
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5 votes
2 answers
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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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7 votes
2 answers
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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 ....
Oion Akif's user avatar
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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 ...
Kanchu's user avatar
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1 vote
1 answer
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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 ...
Alex's user avatar
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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 ...
Marvin's user avatar
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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?
Joey Martin's user avatar
3 votes
1 answer
5k 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 ...
joeyyko's user avatar
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3 votes
1 answer
9k 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 ...
Haravikk's user avatar
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