How To Clean Install OS X El Capitan
On September 30, 2015, Apple showcased OS X El Capitan 10.11, which is the latest operating system for Mac devices and which comes with a smart user-interface design that users have firstly seen in OS X Yosemite.
The users are able to replace Yosemite with El Capitan via the Mac App Store, but this doesn’t completely remove the elements of the previous OS, which may lead to performance issues or other errors. This is the reason why we suggest you to perform a clean install of the new OS X El Capitan, making sure that this new operating system runs smoothly on your Mac.
HINT: Before you start performing the clean install, make sure that you back up all your important data on a different drive than the one where the new OS will be installed to.
Making A USB Flash Drive Bootable
You will need to use the Disk Utility application in order to make the USB Flash Drive Bootable. So, connect the USB Drive to your Mac, open Applications and start the “Disk Utility”. Select the USB drive from the left sidebar and click on the “Erase” tab. Select Mac OS Extended in the box and make sure that you leave “Untitled” as the standard name. Hit the “Erase” button and wait until the formatting of the USB is complete.
Now you will need to go to the Partition Layout drop-down menu and open the Partition tab. Make sure that the “GUID Partition table” is selected, as the partition scheme and the name are set to “Untitled”.
Downloading And Installing El Capitan On Your Mac Using A Bootable USB Drive
Download the OS X El Capitan from the Mac App Store and change the name of the file to “Install OS X Elcapitan.app, so you can easily find it. Close the installer and go to the Applications/Utilities and open the Terminal application. Use the following command:
sudo /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia –volume /Volumes/Untitled –applicationpath /Applications/Install OS X El Capitan.app –nointeraction
It will take around 10-20mins to complete the bootable USB flash drive and once it’s done, you will be able to use the USB Flash drive to perform a clean install of the OS X El Capitan on your Mac device.
Now, you will need to restart your Mac and press the option key when you hear the startup sound during the boot sequence. You will be asked to select the drive you want to boot from and here you will select the USB Bootable Drive that you’ve just created and press “Enter”.
After a few minutes the El Capitan installer will appear and you will need to select Disk Utility and click “Continue”. Now, choose Macintosh HD from the left side panel and click on the “Erase” tab from the top right side.
Finally, after the driver is formatted, go back to the main screen showing Disk Utility, select “Install OS X” and click “Continue”. Just follow the prompts and you will have the OS X El Capitan installed on your Mac in a few minutes. Enjoy!