Mac Apps for Utilities & Operating Systems. Whether you want to optimize your system's productivity or your own, utilities should be in your toolbox. System Disk Utility 2.6.2 for Mac OS X Server 1.2 is a Mac OS program that allows you to select which hard disk your computer will start up from.

• Disk Utility For Pc
• Download Disk Utility For Windows
• Disk Utility Download Free

• Supported version: 0.6.5

While you don't need a fresh install of macOS to use OpenCore, some users prefer having a fresh slate with their boot manager upgrades.

To start we'll want to grab ourselves a copy of macOS. You can skip this and head to formatting the USB if you're just making a bootable OpenCore stick and not an installer. For everyone else, you can either download macOS from the App Store or with Munki's script.

# Downloading macOS: Modern OS

• This method allows you to download macOS 10.13 and newer, for 10.12 and older see Downloading macOS: Legacy OS

From a macOS machine that meets the requirements of the OS version you want to install, go directly to the App Store and download the desired OS release and continue to Setting up the installer.

For machines that need a specific OS release or can't download from the App Store, you can use the Munki's InstallInstallMacOS utility.

In order to run it, just copy and paste the below command in a terminal window:

As you can see, we get a nice list of macOS installers. If you need a particular versions of macOS, you can select it by typing the number next to it. For this example we'll choose 10:

• macOS 11, Big Sur Note: As this OS is quite new, there's still some issues with certain systems to resolve. For more information, see here: OpenCore and macOS 11: Big Sur
  • For first time users, we recommend macOS 10.15, Catalina
• Nvidia GPU Note: Reminder to verify whether your hardware support newer OSes, see Hardware Limitations

This is going to take a while as we're downloading the entire 8GB+ macOS installer, so it's highly recommended to read the rest of the guide while you wait.

Once finished, you'll find in your ~/macOS-Installer/ folder a DMG containing the macOS Installer, called Install_macOS_11.1-20C69.dmg for example. Mount it and you'll find the installer application.

• Note: We recommend to move the Install macOS.app into the /Applications folder, as we'll be executing commands from there.
• Note 2: Running Cmd+Shift+G in Finder will allow you to easily jump to ~/macOS-installer

From here, jump to Setting up the installer to finish your work.

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# Downloading macOS: Legacy OS

• This method allows you to download much older versions of OS X, currently supporting all Intel versions of OS X(10.4 to current)

# Legacy macOS: Offline method

This method allows us to download full installers from Apple, however is limited to 10.10, Yosemite, so older OSes will need to be grabbed via the 'Online Method' mentioned below.

To start, go to the following link:

Download your desired version and a .pkg file should be provided.

Depending on what OS you're on, you can run this script and head to Setting up the installer however if you receive this error:

This means we'll need to manually extract the installer.

# Extracting the Installer

To start, grab the InstallMacOSX/InstallOS.dmg and mount it:

Next, let's open up terminal window and make a folder on our desktop to break things. Run one at a time:

Now we get to the fun part, extracting the installer(Note this may take a few minutes):

• For El Capitan(10.11) and older:

• For Sierra(10.12):

Next, run the following(one at a time):

• Yosemite:

• El Capitan:

• Sierra:

Once this is done, you can head to Setting up the installer!

# Legacy macOS: Online method

This method allows us to download legacy versions of macOS including 10.7 to current, however these are only recovery installers so require an internet connection inside the installer itself

To start, you'll want to use macrecovery.py instead. This tool is actually already bundled in OpenCorePkg:

Instructions for running are quite simple, choose from one of the below commands depending on which OS you want to download:

From here, run one of those commands in terminal and once finished you'll get an output similar to this:

Once this is done, format your USB as FAT32 with GUID Partition Scheme:

And finally, create folder on the root of this drive called com.apple.recovery.boot and place the newly downloaded BaseSystem/RecoveryImage files in:

From here, you can skip to Setting up OpenCore's EFI environment

# Legacy macOS: Disk Images

This method instead relies on hosted images either from Apple or Acidanthera, and restoring onto your drive.

# Acidanthera Images

The below installers were pulled from genuine Mac restore disks with their SMBIOS lock removed, contents of OS X itself have not been modified in any way.

# Apple Images

Note that these images require you to have an Apple Developer account to access.

# Restoring the drive

Now comes the fun part, you'll first want to open the dmg you just downloaded and have it mounted. Now open Disk Utility and format your drive as macOS Extended(HFS+) with a GUID partition map:

Next we have 2 options to follow:

• ASR Restore(Apple Software Restore)
  • Terminal based, works with SIP enabled
• Disk Utility Restore
  • May require SIP disabled in newer OSes

# ASR

Here you'll simply want to open terminal and run the following:

• Note: This may not align with your setup, please change accordingly:
  • Change /Volumes/Mac OS X Install DVD to what your mounted Disk Image is called
  • Change /Volumes/MyVolume to what your USB is called

This will take some time but once you're finished, you can skip to Setting up OpenCore's EFI environment

# Disk Utility

Due to some pesky issues with Disk Utility, many restores can fail if SIP is enabled. If you have issues we recommend either using the ASR Method or disable SIP.

To start, open Disk Utility and you should see both your USB drive and the Disk Image in the sidebar. From here, select restore

This will take some time but once you're finished, you can skip to Setting up OpenCore's EFI environment

If you get an error such as this one during restore:

This likely means SIP needs to be disabled, however we recommend using ASR Method instead.

# Setting up the installer

Now we'll be formatting the USB to prep for both the macOS installer and OpenCore. We'll want to use macOS Extended (HFS+) with a GUID partition map. This will create two partitions: the main MyVolume and a second called EFI which is used as a boot partition where your firmware will check for boot files.

• Note: By default, Disk Utility only shows partitions – press Cmd/Win+2 to show all devices (alternatively you can press the View button)
• Note 2: Users following 'Legacy macOS: Online method' section can skip to Setting up OpenCore's EFI environment

Next run the createinstallmedia command provided by Apple(opens new window). Note that the command is made for USB's formatted with the name MyVolume:

This will take some time so you may want to grab a coffee or continue reading the guide (to be fair you really shouldn't be following this guide step by step without reading the whole thing first).

You can also replace the createinstallmedia path with that of where your installer's located (same idea with the drive name).

Pulled from Apple's own site: How to create a bootable installer for macOS(opens new window)

# Legacy Setup

For systems not supporting UEFI boot, see below:

To start, you need the following:

Download Disk Utility For Windows

• BootInstall_IA32.tool or BootInstall_X64.tool
  • This can be found in OpenCorePkg under /Utilties/LegacyBoot/
• Install USB(Created above)

Within your OpenCore build folder, navigate to Utilities/LegacyBoot. Here you'll find a file called BootInstall_ARCH.tool. What this does is install DuetPkg to your desired drive.

Now run this tool in terminal with sudo(This tool will likely fail otherwise):

This will give you a list of available disks, choose yours and you will be prompted to write a new MBR. Choose yes[y] and you'll be finished.

This will provide you with an EFI partition with either a bootia32 or bootx64 file

# Setting up OpenCore's EFI environment

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Setting up OpenCore's EFI environment is simple – all you need to do is mount our EFI system partition. This is automatically made when we format with GUID but is unmounted by default, this is where our friend MountEFI(opens new window) comes in:

You'll notice that once we open the EFI partition, it's empty. This is where the fun begins.

# Now with all of this done, head to Setting up the EFI to finish up your work