Select the drive you want to image. From the File menu, select New > Disk Image from Folder. It’s located in Applications > Utilities. Here’s how to make a Mac start up disk image using Disk Utility: Launch the Disk Utility application.
Create A Startup Disk Mac OS X FromInstall Mac OS X from USB. Once done, your drive is immediately ready for you to use. It will install an app named Install OS X El Capitan into your Applications folder.Disk Drill will then create your bootable Mac drive while you wait. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. 12, 2021Download: OS X El Capitan This will be downloaded as a disk image named InstallMacOSX.dmg.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. Booting means using a particular disk.If your Mac suddenly refuses to boot up properly, you might need a bootable macOS USB installer to make repairs. How to find or create a startup disk in OS X Mavericks. Your situation will determine where you go from there though.Before you declare your Mac terminally ill, try out this advice.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. You can get a copy of the latest macOS version from Apple download portal or App Store here. Part 1: Download macOS or Mac OS X DMG FileThe first step is to get the DMG disk image file for the version of macOS that you want. All the steps except the last one are done on a Windows 10 machine. Archiving utility for mac disappeared kindleSo 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. However, FAT32 can be only used for installing OS with legacy BISO, which doesn't work for macOS. That's formatting the USB to GPT.Mostly, the USB drive was formmated to FAT32 in default when being shipped out from the factory. After installing the application, follow the sequence of steps shown below:Updates (Dec 8, 2020): The latest version of UUByte DMG Editor is able to format the USB automatically.Download Mac Version Part 3: Format USB Drive to GPT If FailedIf the USB drive created in above step was not seen as a bootable device on your Mac, then you need to take an addtional step before burning. Although this is a premium software, you can use the initial free trial period to create a bootable macOS USB on Windows 10. It's time to download UUByte DMG Editor for Windows. Please don'y worry and ignore this error. Once you select it, the computer will boot from the disk and the macOS installation will begin.Flashing Error: You might receive a flashing error message at the end of burning process. It might have a different name, but as long as it is bootable, you'll be able to see it there. This will take you to the Startup Disk Manager, where you should be able to see the USB drive. To boot from the disk, you need to hold down the option key when you hear the boot chime. In elevated Command Prompt (Ctrl+Shift+Enter), input the following series of commands followed by Enter after each line:Select Disk X (X stands for the USB drive name that appears after the previous command)Part 4: Boot Mac from macOS USB Drive for InstallationNow remove the USB drive and insert it into the Mac computer. If you don't do these two steps correctly, the output drive from the UUByte DMG Editor software won't be bootable, which means you can't install macOS from that USB drive, and you may need to do the whole thing over again.
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