Hey there. I've got an iMac 27' mid 2011 which has a dying hard drive inside, which is causing it not to boot. The only other Mac I have around is a PowerMac G5. I've read in the Apple Support forum that you need a system running El Capitan or later to use createinstallmedia, but I don't really have another choice, except on windows (which I haven't read anything on about this).
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I’m trying to make a bootable usb for El Capitan for. Apparently there’s a problem with the Sierra installer downloaded from Apple recently, making you. Step 2: Now that El Capitan is downloaded, you will now need to create a bootable OS X El Capitan USB flash drive. Doing this will allow you to install a fresh copy of OS X on your Mac from the flash drive, rather than having to upgrade to the new OS over an existing installation. In the following words, I will show the instructions of how to make Mac OS X 10.11 El Capitan USB installer very quick in either Windows or Mac OS X. DOWNLOADSYou need to prepare an USB (8 GB. Now, import DMG file and click Burn button to burn macOS dmg file to USB drive. Lastly, plug the USB drive into Mac and press Option key to select the drive from startup menu. From there, you can start installing macOS from bootable USB drive. My Testing Environment: Windows 10 Home/SanDisk USB 3.0 64G/macOS Mojave & Catalina DMG File. Find out how to create a bootable installer for macOS as well as what operating system and hardware you’ll need to do it.
What I want to do is create a bootable USB drive with any recent enough OS for the iMac (I believe it can run anything from Mountain Lion to High Sierra, it was previously running High Sierra).
Any suggestions on my options are appreciated. Thanks!
Posted on Jul 23, 2021 4:37 AM
Introduction
Apple officially released OS X 10.11 El Capitan operating system in September 2015 as an update through Apple App Store. This actualization will update core of your system and preserve your user data.
However, if you want to have a clean installation of El Capitan on your Mac you will need to create a special installation USB drive and in this article we will show you how.
Four ways how to create El Capitan USB installation flash drive:
Preparation - get OS X El Capitan installer and USB flash drive
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Download El Capitan installer (Install OS X El Capitan.app in Applications folder) available in Mac App Store.
Prepare a flash drive with OS X Disk Utility. Format it with GUID Partition Table and name it as Untitled. The minimal capacity of flash drive must be 8 GB.
How to create El Capitan installation USB drive with createinstallmedia tool
The createinstallmedia is a command line tool distributed with OS X installer.
When you have prepared your USB flash drive and El Capitan installer is downloaded from App Store ► open Terminal and type command:
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sudo /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install OS X El Capitan.app --nointeraction
In our case 'Untitled' is the name of USB flash drive! Replace 'Untilled' by name of your flash drive.
Wait a few minutes and your El Capitan installation USB drive will be prepared.
To install OS X El Capitan ► restart computer ► hold the Option key and select Installation USB drive from the menu.
How to create El Capitan USB installation with Terminal commands
When your USB flash drive is ready and El Capitan installer downloaded from App Store ► Open Terminal and type the following sequence of commands:
sudo hdiutil attach /Applications/Install OS X El Capitan.app/Contents/SharedSupport/InstallESD.dmg
sudo asr restore -source /Volumes/OS X Install ESD/BaseSystem.dmg -target /Volumes/Untitled -erase -format HFS+
sudo rm /Volumes/OS X Base System/System/Installation/Packages
sudo cp -a /Volumes/OS X Install ESD/Packages /Volumes/OS X Base System/System/Installation/Packages
sudo cp -a /Volumes/OS X Install ESD/BaseSystem.chunklist /Volumes/OS X Base System
sudo cp -a /Volumes/OS X Install ESD/BaseSystem.chunklist /Volumes/OS X Base System
sudo cp -a /Volumes/OS X Install ESD/BaseSystem.dmg /Volumes/OS X Base System
hdiutil detach /Volumes/OS X Install ESD
Now wait until your bootable installation flash drive with OS X 10.11 El Capitan is made.
To install OS X El Capitan ► restart computer ► hold the Option key and select Installation USB drive from the menu.
How to create El Capitan USB installation with Disk Utility and Finder
When your USB flash drive is ready and El Capitan installer downloaded from App Store ► Open Terminal and type:
defaults write com.apple.finder AppleShowAllFiles 1 && killall Finder
This command allows you to view hidden files in Finder.
Now Open Finder ► Applications ► Install OS X El Capitan.app ► right click ► Select Show Package Contents option.
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Navigate to Contents/SharedSupport ► Mount InstallESD.dmg file
Open OS X Install ESD archive in Finder and mount BaseSystem.dmg archive
Connect USB drive and open Disk Utility (/Applications/Utilities)
Select the USB drive from the list of disks, select Restore tab and pick Select OS X Base System archive as a source and USB flash drive as the destination. When ready click on Restore button.
After the Restore process is finished, open Finder ► open USB drive (OS X Base System) ► go to the System/Installation folder and select Packages file and delete it.
Open OS X Install ESD volume in Finder, select Packages folder and copy them to System/Installation folder on USB drive.
Also copy BaseSystem.chunklist and BaseSystem.dmg files from InstallESD.dmg volume to root of USB flash drive (OS X Base System).
Now your El Capitan installation USB drive is prepared and ready for use.
To install OS X El Capitan ► restart computer ► hold the Option key and select Installation USB drive from the menu.
How to create El Capitan USB installation disk with DiskMaker X
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DiskMaker X tool is Wizard like tool that allows you create OS X installation disk. Download DiskMaker X to your Mac and copy it to Applications folder.
When you have prepared your USB flash drive and El Capitan installer is downloaded from App Store ► open DiskMaker X.
Select version of OS X (in our case El Capitan)
Select copy of OS X installation app
Select USB drive that will be used for USB installation
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And wait a few minutes till the the DiskMaker X finish creating process.
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To install OS X El Capitan ► restart computer ► hold the Option key and select Installation USB drive from the menu.