Sep 23, 2019  Once your bootable USB installation media is ready, remove it and insert it into your Mac, power it on, holding down the Option key, and select the USB you just created to reinstall Mac OS X. If you’re having issues trying to create a bootable media, you can get a USB flash drive that comes with Mac OSX ready to install. Click 'Burn' button on toolbar or select the 'Tools Burn' Menu. PowerISO shows 'DMG Burner' dialog. Click 'Browse' button to select the DMG file you want to burn. Select the burning drive and the burning speed from the list. The default burning speed is maximum speed supported by the writer and media. You can change it to a slower speed if necessary. Click 'Burn' button to start burning. PowerISO will. Quickly create a macOS bootable USB on Windows. Now make bootable USB using the TransMac software (follow instructions that are given above). Now connect the USB and power on your Mac computer while holding the option key and then select the USB Flash media to run the installation. Learn using USB on MAC (Apple support page). Dec 10, 2018  Method 1: How to Create Bootable DVD from DMG (Command Prompt) This approach utilizes a tool called DMG2IMG, which converts DMG file into ISO, the universally more compatible archive format. This ISO file is then burned using a command line execution in Command Prompt. Sep 13, 2018  Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra. First, review this introductory article: Create a bootable installer for macOS. Second, see this How To outline for creating a bootable El Capitan installer. Simply replace the Terminal command with the one from the preceding article by copying it into the Terminal. A Mac machine needs to be reformatted with Lion. I backed up the Lion dmg file when I purchased it via the Mac App Store. I now need to create a bootable USB drive from the DMG file but I need to be.

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Oct 08, 2013  This video explains how you can extract, and burn InstallESD.DMG, the Mac OS X installer file for OX 10.7 Lion, OS X 10.8 Mountain Lion, to a bootable DVD in Windows 7, 8 or Windows 10.

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A DMG file is Apple's equivalent of an ISO installation file or disk image. It usually contains all the information required to install a program on a Mac computer running Mac OS X or macOS. It is also a container to hold macOS installation image. If you want to create a bootable macOS bootable disk, the first step is to burn DMG to USB or DVD.

However, native support for DMG files is only available on Apple's desktop operating system. For Windows or Linux, you will need to use different methods. For example, if you want to burn a DMG file to USB on a Mac, it's as easy as using the built-in Disk Utility tool. On Linux and Windows, you obviously have to use other ways. This article explains how to burn a DMG file to a USB flash drive on a Mac, a Windows computer and a machine running Linux.

Method 1: How to Burn DMG to USB on macOS or Mac OS X

If you have a Mac, then Disk Utility will help you create your bootable USB drive. Since this is a native application, no downloads are required. The built-in tool will be able to directly burn the DMG file to a disk or drive. You simply have to follow the process as described below:

Step 1: Open Disk Utility by going to Applications >> Utilities and clicking on the tool.

Step 2: You should be able to see all the drive names in the left-side panel. Now open a Finder window and drag your DMG file into Disk Utility. Drop it in the blank area below the drive names on the left panel.

Step 3: You can now insert your USB drive and wait for it to appear in the drives list. Next, click on your mounted DMG file on the left panel and click on ‘Burn' in the top toolbar. When you see the ‘Burn Disk In:' message, click on the USB drive.

The DMG file will now be burned to the USB drive, and you can use it to do program installations. Disk Utility has a good burn success rate, so hopefully you won't have to repeat the process to get it right.

Method 2: How to Burn DMG to USB in Windows 10 (Bootable)

Since Windows doesn't natively support DMG files, you will need to first download and install a utility that can handle such disk images. The best software for the job is WizDMG, a Windows-based desktop solution for authoring Apple's disk image files in a non-Mac environment.

WizDMG requires no technical expertise to use. The clean interface only shows the user the necessary functions, and all the heavy lifting is done at the back end. One of the unique features of this increasingly popular software is the amount of beta testing it has gone through. Extensive and gruelling tests with different storage media brands and Windows versions have made this one of the most reliable DMG utilities for Windows. With one of the industry's highest burn success rates, it's no wonder that WizDMG is emerging as the leader in its class.

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Step 1 Install WizDMG

Download WizDMG to your Windows PC and install the program by following the setup instructions in the wizard.

Step 2 Load DMG File into WizDMG

After launching the program, you'll see various options on the home page. Click on 'Burn' to kick off the process. Now click on 'Load DMG' to add the file to the program, and insert a USB flash drive.

Step 3 Start Burning DMG to USB

The drive will be automatically detected by the software, so all that's left is to click on 'Burn' and wait for your drive to get ready.

The USB drive will contain the DMG image you selected, and this can now be a portable boot drive to install that particular program on any Mac computer.

Method 3: How to Burn a DMG File to USB in Linux

The process of burning a DMG to USB in Linux is a little more complicated since it requires converting the file to an ISO before burning it to a drive. It also requires command line executions, but if you own a Linux machine you may already be familiar with command line work. Please note that in order for the USB drive to be bootable, the original DMG must have boot information. In here, we take Ubuntu Linux as an example.

Step 1: Download and install dmg2img by using the following command: sudo apt-get install dmg2img

Step 2: Convert the DMG to IMG with the following command: dmg2img sample.dmg

Step 3: Change the filename of the resulting .img file to .iso. Remember, this is still an IMG file, but it will have a .iso extension. Use the command below to do this: mv sample.img sample.iso

Step 4: Insert the USB drive, but make sure it is not mounted. If it is, you can unmount it with the following command: sudo umount /media/

Make sure you know the file path to the mounted USB drive. Although external drives are generally mounted in /media in Linux, it could be in a different location. To check, you can use this command: lsblk

This command reads the sysfs file system and shows you information about block devices. Your drive can usually be identified by the size, but make sure you use the correct disk name, not the partitions within the disk.

Step 5: You can now burn the DMG to the USB drive with the following command:

sudo dd bs=4M if=sample.iso of=/dev/sdX %% sync

If the original DMG file was bootable, then this .img version on your USB will also be bootable. The process looks a bit complicated, but it should work as long as you follow the steps described above.

The Bottom Line:

As we can see, burning DMG to USB on Mac is the easiest solution as you don't need to install any other tools or type command to complete the task, which could be annoying for some users. How about the Mac was broken and you want to create a bootable macOS disk to repair the computer? That depends what kind of computer you get at hand. Just follow the steps listed above according to the computer model.

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If your Mac suddenly refuses to boot up properly, you might need bootable macOS install USB to make repairs. But how do you create such a disk if all you're left with is a Windows 10 computer? Fortunately, there's a great tool that you can use for free to create bootable macOS media on a USB drive in a Windows 10 environment. This article shows you how to download a macOS DMG file, format a USB drive using a GUID Partition Table, burn the DMG to the drive and boot your Mac from the USB. All the steps except the last one are done on a Windows 10 machine.

Part 1: Download macOS or Mac OS X DMG File

The first step is to get the DMG disk image file for the version of macOS that you want. You can get a copy of the latest macOS version from Apple download portal or App Store here. There are also several other direct download sites that offer various versions of Mac OS X in DMG format rather than the standard APP format that runs on Mac. Since you're working in a Windows environment, you need the DMG rather than the APP file.

Part 2: Format USB Drive to GPT

Mostly, the USB drive was formmated to FAT32 in default when being shipped out from the factory. However, FAT32 can be only used for installing OS with legacy BISO, which doesn't work for macOS. So the next step is to format your USB drive in the GPT partition style in order to burn installation files to the desired USB drive. You can do this in Command Prompt as admin. In elevated Command Prompt (Ctrl+Shift+Enter), input the following series of commands followed by Enter after each line:
Diskpart
List disk
Select Disk X (X stands for the USB drive name that appears after the previous command)
Clean
Convert GPT
Create partition primary

Part 3: Create Bootable macOS USB from Windows 10

You have now formatted the partition of USB drive. It's time to download TransMac for Windows. Although this is a premium software, you can use the initial free trial period to create a bootable macOS USB drive on Windows 10. After installing the application, follow the sequence of steps shown below:

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Step 1: Right-click the icon and select Run as Administrator from the contextual menu. Choose Run when prompted.

Step 2: Insert your formatted USB drive, and you will be able to see it in the TransMac software on the left panel.

Step 3: Right-click the USB and select Restore with Disk Image in the contextual menu. Click Yes in the warning popup.

Step 4: You will see a window that says Restore Disk Image to Drive. Here, select your DMG file in the dropdown menu and click OK.

Depending on the system configuration, this can take anywhere from a few minutes to a couple of hours. Once the progress bar is at 100%, a bootable USB is ready.

Part 4: Boot macOS Install USB on Mac

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Now remove the USB drive and insert it into the Mac computer. To boot from the disk, you need to hold down the option key when you hear the boot chime. This will take you to the Startup Disk Manager, where you should be able to see the USB drive. It might have a different name, but as long as it is bootable, you'll be able to see it there. Once you select it, the computer will boot from the disk and the macOS installation will begin.

Conclusion:

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The whole process might look a bit complicated if this is your first time, but just follow the instructions in this article and you should be fine. That being said, you need to be careful when downloading the DMG file and formatting your USB drive. If you don't do these two steps correctly, the output drive from the TransMac software won't be bootable, which means you can't install macOS using it, and you may need to do the whole thing over again.