If youâre still using a Mac OS X the time will come when your computer wonât boot, or a problem may arise where you canât take control of the device, and booting from an OS X installation media will be required.
This is why itâs recommended that you make a Mac OS X bootable USB when your Mac is in working conditions. However, if you find yourself on a scenario where your device (iMac, MacBook Pro, Air, Mac Pro or Mini) is not responding and you happen to have a Windows device, then you can still be able to make a USB bootable installation media for your Mac OS X to reinstall the operating system using the Recovery Assistant.
These instructions will also work for Windows users, who are running Mac OS X on a virtual machine and need to upgrade to the latest version. For instance, to OS X Yosemite.
Things to know before proceeding
Before you dive into this guide, youâll need a few things:
Now that you have all the necessary ingredients, youâre ready to make a Mac OS X bootable USB using the DMG file of the operating system with the steps below.
TransMac - Make DMG File Bootable USB on Windows. This is a fairly robust application for creating bootable USB on Windows from a DMG file. However, there's a preparatory step to be executed before you can create the bootable USB drive. Switch app mac os. In Windows, most dmg images can be opened using several other programs such as Acute Systems TransMac, HFSExplorer, 7-Zip, UltraISO or IsoBuster. MacDrive9 can also mount simple dmg files as drives under windows, but not sparse disk or encrypted dmgs. I suggest you try 7-Zip as you can use it for free and it's pretty solid software.
How to create Mac OS X bootable USB installation media
Step 1: Open Command Prompt by typing cmd in the Run windows and hitting Enter. Step 2: In the command interface, go to the directory in which the DMG file is saved. Step 3: Use the following command to convert the DMG file to ISO: Step 4: Once the ISO file has been created, you can use a. 6 Best Free DMG to ISO Converter Software for Windows ISO Workshop. ISO Workshop is a nice free DMG to ISO converter software for Windows. ImgBurn is another free software to convert DMG to ISO. BurnAware is a free software with multiple disc burning tools. IToposft ISO. DMG file format is one of the most well-known container format to distribute and compress software on Mac operating system. You can compare DMG files with ISO files in Windows computers. The only difference is DMG is compatible with Mac computers and ISO is compatible with Windows computers.
Before you can use TransMac, you may first need to partition your USB flash drive with a GPT partition, as a normal MBR partition may not work. To do this, youâll need to use the Diskpart command-line utility on Windows.
Setting up GPT partition
Use these steps to set up a USB drive with a GPT partition:
After you complete the steps, the USB flash drive from MBR to GPT format, you can use the steps below to create a bootable USB installation media to install Mac OS X.
Creating USB install media
Use these steps to create a bootable media to install Mac OS X:
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 youâre having issues trying to create a bootable media, you can get a USB flash drive that comes with Mac OSX ready to install.
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