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Article ID = 43
Article Title = How To Obtain And Use The macOS Install Disc Image
Article Author(s) = Graham Needham (BH)
Article Created On = 21st July 2011
Article Last Updated = 10th September 2014
Article URL = https://www.macstrategy.com/article.php?43
Article Brief Description:
Instructions for obtaining the OS X install disc image

How To Obtain And Use A macOS Disc Image (for OS X 10.7 or later)

What's your situation?

You made a backup copy of the 'Install macOS / OS X' installer package before installing macOS / OS X - click here
You are about to purchase, download and install macOS / OS X - click here
You have purchased and downloaded macOS / OS X but have not installed it yet - click here
You have already purchased, downloaded and installed macOS / OS X - click here
You have already obtained the macOS / OS X disc image and want to know what to do with the macOS / OS X disc image

Obtain the macOS / OS X Installer - macOS / OS X Not Purchased Yet

Click the install or download button for macOS / OS X which will download the macOS / OS X Install installer package to your hard disk (it may take a while as it is 4.3GB+ in size). At the point where the macOS / OS X installer has downloaded it will automatically launch and ask you to continue. Download Windows 10 Disc Image (ISO File) Before updating, please refer to the Windows release information status for known issues to confirm your device is not impacted.

Go to Macintosh HD > Applications > App Store.
Go to Store menu and Sign In if necessary (using the Apple ID you purchased OS X 10.7 or later with).
From the 'Store' menu now select 'Search' and search for 'macOS'.
Locate the latest version of macOS / OS X e.g. macOS 11 Big Sur.
Click the 'Buy' button

NOTE

Purchase and download the macOS / OS X Install installer package to your hard disk (it may take a while as it is 4.3GB+ in size).
At the point where the macOS / OS X installer has downloaded it will automatically launch and ask you to continue.
Do not click Continue yet.
Quit the macOS / OS X installer (yes, quit it).
Now go to Obtain The macOS / OS X Disc Image section below

Obtain the macOS / OS X Installer - macOS / OS X Already Purchased

Go to Macintosh HD > Applications > App Store.
Go to Store menu and Sign In if necessary (using the Apple ID you purchased OS X 10.7 or later with).
Alt-click on the Purchases icon. This will show you a list of all software previously purchased. The 'macOS / OS X' item in the list should have an 'Install' or 'Download' button to the right of it.

NOTE

Click the install or download button for macOS / OS X which will download the macOS / OS X Install installer package to your hard disk (it may take a while as it is 4.3GB+ in size).
At the point where the macOS / OS X installer has downloaded it will automatically launch and ask you to continue.
Do not click Continue yet.
Quit the macOS / OS X installer (yes, quit it).
Now go to Obtain The macOS / OS X Disc Image section below

Obtain the macOS / OS X Installer - macOS / OS X Already Purchased And Installed

Go to Macintosh HD > Applications and check for an 'Install macOS / OS X' item - if it exists go to the Obtain The macOS / OS X Disc Image section below otherwise continue with these instructions.

NOTE

USB, FireWire or Thunderbolt hard disk
USB stick
SDXC card (if your Mac supports it e.g. recent MacBook Pro or Mac mini)

NOTE

Restart your computer using the (Internet) Recovery mode
When the macOS / OS X Utilities window appears select the Install macOS / OS X option
Choose your external storage device as the destination
Let the installation start and watch the installation process carefully (it may take a while as it is 4.3GB+ in size)
When the Mac automatically restarts there will be a black screen for a moment - at this point unplug/eject/disconnect the external storage device
The Mac may stall for moment but then should boot normally to your desktop or login screen
Reattach the external storage device
There should be a folder on it called 'macOS / OS X Install Data' that contains a disk image file called 'InstallESD.dmg' - if this is missing, then you probably waited too long to unplug the drive. Go back and start this section again
Copy the 'InstallESD.dmg' file to your desktop or preferably to another disk/storage device or even burn it to a DVD so that you have a backup of it.
Now choose what you want to do with the macOS / OS X disc image

Obtain The macOS / OS X Disc Image

Go to Macintosh HD > Applications and locate the 'Install macOS / OS X version name here' installer package (e.g. 'Install macOS High Sierra') or find your backup copy of it.
Right/control click on the 'Install macOS / OS X' installer package and select 'Show Package Contents' from the contextual menu.
Navigate to Contents > SharedSupport and locate the 'InstallESD.dmg' file.
Copy the 'InstallESD.dmg' file to your desktop or preferably to another disk/storage device or even burn it to a DVD so that you have a backup of it.
Close all the windows.
You can now use the macOS / OS X disc image (InstallESD.dmg) to:

Create an External Installation Device.
Create an Emergency Boot Drive for macOS / OS X / Mac OS X you can use it to boot your computer and repair your hard disk and/or reinstall macOS / OS X / Mac OS X.
Create an Install DVD (see instructions below).

How To Create An Install DVD From The macOS / OS X Disc Image

You will need a Mac with a DVD Writer and a blank/unused, single or dual layer DVD-R or DVD+R disc (depending on the size of the disc image for the version of macOS / OS X you are burning).

Obtain the macOS / OS X Disc Image (see instructions above).
Go to Macintosh HD > Applications > Utilities > Disk Utility.
Click on the 'Burn' button at the top of the Disk Utility window.
Navigate to the macOS / OS X disc image ('InstallESD.dmg' file)
Select the disc image.
Click the 'Burn' button.
Insert the blank/unused DVD-R or DVD+R disc.
Follow the on screen instructions.

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This article is © MacStrategy » a trading name of Burning Helix. As an Amazon Associate, employee's of MacStrategy's holding company (Burning Helix sro) may earn from qualifying purchases. Apple, the Apple logo, and Mac are trademarks of Apple Inc., registered in the U.S. and other countries. App Store is a service mark of Apple Inc.

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Date: 21 December, 2013
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