Here I’d like to share the simple way to create OS X El Capitan Installer Bootable USB Flash Drive. I’ve tried this way through the OS X El Capitan on My MacBook Pro. You’re able to follow the instruction below through your current OS X ( for example : OSX Yosemite,etc) because the concept is same.
Requirements : USB Flash Drive Sandisk 8 GB
Here are the two steps :
Erase the Sandisk Flash Drive with name : “ElCapInstaller”
Run the command below through “Terminal” to create OS X El Capitan Installer :
Done. Now you’ve created the OS X El Capitan Installer Bootable USB Flash Drive successfully. You can use it to install the Fresh / Clean install of OS X El Capitan or to update the previous OS X to OS X El Capitan :).
Reference : http://osxdaily.com/2015/09/30/create-os-x-el-capitan-boot-install-drive/