How to do a clean install of MacOS Sierra
Mac OS X 10.11 called MacOS Sierra has just been released in Beta version. User are not able to upgrade yet. However, if you want to start fresh or you want to install MacOS Sierra into an independent partition, the best solution is do a clean installation, erasing the hard disk and installing from scratch.
How to Clean Install MacOS Sierra on a Mac
Download MacOS Sierra
It’s able to download the latest Sierra from this topic.
Create a Bootable Sierra USB
This topic gives you the instruction to do
Installing MacOS Sierra
Once the bootable USB drive has been created, we are ready to perform a clean El Capitan stall.
Step 1: Restart your Mac and hold down the Option key immediately. When your machine boots up, choose the Bootable Sierra USB drive, and then OS X Utilities window will be displayed.
Step 2: Choose “Disk Utility”, then select the main hard drive or the particular partition to format by click on “Erase” button. This process will erase all data existing on the Hard drive or the partition.
Step 3: Get back to the main menu to choose “Install OS X”, you then will be asked to choose the Hard drive when prompted and continue with the installation.
From now, just follow the further steps to accomplish doing a clean install of MacOS Sierra.