13-05-2021

How To Put The Sierra Dmg Into Live Usb

Riwam

macrumors 65816
I don't know if this is the right place to ask it but hope so.
I have a Disk Warrior 4.4 DVD.cdr file.
In previous OSX I could boot a Mac from a DVD.
Present Macs do not seem to allow it (I have now Mavericks in a new MacPro).
In order to have a possibility to check the main drive of the new MacPro from outside with Disk Warrior (in case I might one day need it) I tried unsuccessfully to make a bootable USB stick with that Disk Warrior file in it.
I googled and found in 'blog.lewan.com' a step by step instruction how to transform any ISO file into a img (not needed in my case since a .cdr is already an Image) and how, using in the Terminal hdiutil and diskutil the needed file should be finally transferred to the USB stick.
In such a way by pressing the Alt key when booting the Mac I might choose to boot from the key and use in my case Disk Warrior.
So I thought...
However I have not found any way to make it work.
Neither copying directly the .cdr file to the USB stick not transforming the .cdr (which is already an Image!) into a .dmg nor any other way (for instance use 'Restore' in Disk Utility) brought me a bootable USB stick with Disk Warrior in it.
When pressing the Alt key at booting the computer I only see the small EFI volume created on the USB stick, but not the Disk Warrior part of it.
Any help will be greatly appreciated !!!!

These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

How to create a bootable installer for macOS. It installs an app named Install macOS Sierra into your Applications folder. Connect the USB flash drive or other volume that you're using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.

Download macOS

Find the appropriate download link in the upgrade instructions for each macOS version:

  • macOS Catalina, macOS Mojave, and macOS High Sierra download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation.
    To get the required installer, download from a Mac that is using macOS Sierra 10.12.5 or later or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
  • macOS Sierra downloads as a disk image that contains a file named InstallOS.pkg. Open this file and follow the onscreen instructions. It installs an app named Install macOS Sierra into your Applications folder.
  • OS X El Capitan downloads as a disk image that contains a file named InstallMacOSX.pkg. Open this file and follow the onscreen instructions. It installs an app named Install OS X El Capitan into your Applications folder.

Use the 'createinstallmedia' command in Terminal

  1. Connect the USB flash drive or other volume that you're using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
  2. Open Terminal, which is in the Utilities folder of your Applications folder.
  3. Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.
    Catalina:*
    Mojave:*

    High Sierra:*
    Sierra:
    El Capitan:
  4. Press Return after typing the command.
  5. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
  6. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
  7. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument, similar to the way this argument is used in the commands for Sierra and El Capitan.

Use the bootable installer

How To Put The Sierra Dmg Into Live Usb Driver

After creating the bootable installer, follow these steps to use it:

How To Put The Sierra Dmg Into Live Usb Cable

  1. Plug the bootable installer into a compatible Mac.
  2. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
    Learn about selecting a startup disk, including what to do if your Mac doesn't start up from it.
  3. Choose your language, if prompted.
  4. A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
  5. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

How To Put The Sierra Dmg Into Live Usb Port

Learn more

For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:

Usb

Catalina:

Mojave:

Sierra

High Sierra:

Sierra:

El Capitan: