UPDATED 12/2/18: If you’re a Mac OS X user the time will come when your computer won’t boot or a problem may arise where you can’t take control of the device, and booting from an OS X installation media will be required. This is why it’s 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 PC, then you can still be able to easily make a USB bootable installation media for your Mac OS X to reinstall the operating system using the Recovery Assistant. Bear in mind that this 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 example, to OS X Yosemite. Things to know before proceeding Before you dive into this guide, you’ll need a few things:. A broken Mac computer with Mac OS X. A trial copy of the TransMac software. One high quality USB flash drive with 16GB of storage. A copy of Apple’s macOS (DMG file). Now that you have all the necessary ingredients, you’re ready to make a Mac OS X bootable USB using the DMG file of the operating system with the steps below.
How to make a Mac OS X bootable USB installation media 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, you’ll need to use the Diskpart command-line utility on Windows. Open Command Prompt with administrative permissions.
To install OS X 10.9 Mavericks on your Mac, restart the device, press the Option key immediately after, select the USB drive you just created from the menu, to use it, and follow the guide shown.
Type the diskpart command and press Enter. Type the list disk command to view a listing of drives connected to your computer and press Enter. Type the select disk command followed the number assigned for the USB flash drive (e.g., select disk 4), and press Enter. Type the clean command and press Enter. Type the convert GPT command and press Enter. Type the create partition primary command and press Enter to complete the task.
After converting 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., which is the software that will make everything happen. TransMac is a paid software, but it has a 15-day trial solution, that give us more than enough time to move the DMG files to the USB drive from Windows. (If you want to support the developer, you can purchase the full version.). Insert the USB drive that you’ll use to fix your installation of OS X. Remember that all the data in the USB will be erased. Make sure you take off any important documents.
Right-click the TransMac software icon and Run as administrator. You’ll be prompted to Enter Key or Run, because we’ll be using it once, click Run. On the left pane, you’ll see all the Windows PC drives listed, right-click the USB drive you’re intending to use to reinstall Apple’s OS X and click Restore with Disk Image. In the warning dialog box, click Yes. Use the Restore Disk Image to Drive dialog box to browse for the DMG file with the installation files for Mac OS X Yosemite in this case, and click OK to create a bootable USB of the operating system.
Now, you’ll have to wait a long time. It could take one or two hours to complete the process depending on your computer and other variables. Since you're here.I've got a small favor to ask.
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This guide deals with 3 ways of making a boot disk from OSX 10.9 Mavericks the first one is the fastest and is done via the Terminal from a new command already in OSX Mavericks called createinstallmedia, the other 2 are older ways when Mavericks was in development and are done with a mixture of finder using Disk Utility and command line. Quickest Way Download Mac OSX 10.9 Mavericks but don’t install. Attach your USB stick/drive.
Launch the Terminal from /Applications/Utilities and enter the command below and then your password when prompted, be sure to change the ‘ Untitled‘ name in the below command to your external disk name: sudo /Applications/Install OS X Mavericks.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install OS X Mavericks.app -nointeraction Let it do its thing and there you have it, one bootable Mac OSX 9 drive. This really is a super simple way – however if using the Terminal fills you with fear and dread, there are some GUI apps that can get the job done namely and a new imaging tool that can clone a new disk very quickly –. Alternative Ways of building a Bootable Mavericks OSX Disk.
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To make a boot disk of OSX 10.9 Mavericks, first of all get the app or download via the App store, if downloaded it will file in the folder Applications. Control / Left click Options, Show in Finder to get to the app, don’t install at this stage. Located in the Applications Folder Finding the InstallESD.dmg To find the actual InstallESD.dmg file, control/left click the ‘Install OS X Mavericks’ app and choose show contents – then navigate to Shared Support folder.
Control/Right click to show contents Navigate to Shared Support folder to see the InstallESD.dmg file Mount InstallESD.dmg Double click to mount the image. Make Invisible Files Visible We need to see the BaseSystem.dmg inside the InstallESD.dmg Crank open Terminal and run: defaults write com.apple.Finder AppleShowAllFiles TRUE killall Finder This will show all invisible files have a look inside the mounted InstallESD.dmg Mount an External Disk Attach a USB/external drive – this guide uses the external drive name called BootDisk, you need to make sure the – it its not you can format that in Disk Utility. Launch Disk Utility Launch Disk Utility as found in Applications/Utilities and go to the Restore tab. Drag BaseSystem.dmg to the Source field and your external disk to the Destination and click Restore. This will mount your new OSX 10.9 external disk and name it OSX Base System – but we need to add the packages.
Fix the Packages Couple of things to fix in the newly created boot disk, remove the Package alias at System/Installation/ folder Now from the previously mounted InstallESD.dmg copy over the Packages folder to the same location where we just removed the alias above. Will take a while as it holds all the install packages.
Job done now you can boot from the OSX 10.9 disk.