![]() This is why we mounted the InstallESD.dmg file earlier, because we can just drag and drop the “Mac OS X Install ESD” image into the “Source” – if you didn’t mount the image, you can manually locate and select the image file yourself by clicking on “Image” Now you need to set the source disk for the restore.Right-click on the USB drive in Disk Utility and select “Restore”.Now that the USB flash drive has been formatted to the appropriate filesystem, we are going to restore the previously mounted InstallESD.dmg file to the blank USB drive. Click on “Erase” to format the USB drive.Choose “Mac OS Extended (Journaled)” as the Format, and name the USB key what you want.Select your USB drive from the left side of Disk Utility, then click on the “Erase” tab.Next, we format the USB flash drive, this will become the bootable Lion installer: Double-click on “InstallESD.dmg” to mount the Lion disk image onto your Mac desktop, it will show up like the image below.Open the “Contents” directory and then go into “SharedSupport”.Right-click (or control-click) on the “Install Mac OS X Lion.app” and select “Show Package Contents”.If you have anything stored on the USB flash drive you’re going to lose it, so be prepared for that and back it up.įirst we are going to locate the Lion InstallESD.dmg file and mount it: We’re going to assume you already have Mac OS X Lion downloaded from the App Store, if you don’t, do that first. How to Create a Bootable Mac OS X Lion Installation USB Drive Download Mac OS X Lion from the Mac App Store ($29.99).8GB+ USB flash key drive, these are cheap and ubiquitous on.A Mac with Mac OS X 10.6.8 so you can download and access Lion.Once your bootable USB installation media is ready, remove it and insert it into your Mac, power it on, hold down the Option key, and select the USB you just created to reinstall Mac OS X.This is pretty easy to do, but I have made the walkthrough as simple as possible with plenty of screenshots, so just follow along the instructions. Depending on your computer and other variables, it could take one or two hours to complete the process. 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 the OK button to create a bootable USB of the operating system. In the warning dialog box, click the Yes button. On the left pane, you’ll see all the Windows PC drives listed right-click the USB drive you intend to use to reinstall Apple’s OS X and select the Restore with Disk Image option. (You’ll be prompted to Enter Key or Run because we’ll be using it once, click the Run option.) Right-click the TransMac software icon and Run as administrator. Make sure you take off any important documents.) (Remember that all the data in the USB will be erased. Insert the USB drive that you’ll use to fix your installation of OS X. (If you want to support the developer, you can purchase the full version.) Quick note: TransMac is a paid software, but it has a 15-day trial solution that gives us more than enough time to move the DMG files to the USB drive from Windows. Type the following command to select the storage and press Enter: select disk 1 Type the following command to determine the USB flash drive and press Enter: list disk Type the following command to open Diskpart and press Enter: diskpart Search for Command Prompt, right-click the top result, and select the Run as Administrator option. Use these steps to set up a USB drive with a GPT partition: To do this, you’ll need to use the Diskpart command-line utility on Windows 10. Create Mac OS X bootable USB installation mediaīefore using TransMac, you first need to partition your USB flash drive with a GPT partition, as a normal MBR partition may not work. 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. One high-quality USB flash drive with 16GB of storage.Requirementsīefore you dive into this guide, you’ll need a few things: These instructions will also work for Windows users running Mac OS X on a virtual machine and needing to upgrade to the latest version. However, if you find yourself in a scenario where your device (iMac, MacBook Pro, Air, Mac Pro, or Mini) is not responding, and you happen to have a Windows 10 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. This is why it’s recommended that you make a Mac OS X bootable USB when your Mac is in working conditions. If you’re still using a Mac OS X, 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.
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