4.2 Installing macOS on an external drive.4.1 Using Third party Utility – Recovery Partition Creator.4 What if you do not have the Recovery HD volume on your startup drive?.3.3 Option 3 – Using terminal Commands ( For El Capitan and macOS Sierra ).3.2 Option 2- Using Disk Utility’s hidden Debug Menu ( In OS X Lion through OS X Yosemite ).3.1 Option 1- Create a Recovery USB Drive using Recovery Disk Assistant.2 What do you need to create Mac OS X recovery USB drive?.1 Why and when should we create a Mac OS X recovery USB drive?.Why and when should we create a Mac OS X recovery USB drive? To recover your data in case of crash or system failure.To get help Online using Safari from recovery partition in case of no boot issue.To run repair and maintenance task for the internal hard drive.To reset the Mac administrator password.It even has Safari that you can use to extract or reinstall Safari from this partition. So, following are the major use of recovery partition.

Your Mac can be booted from recovery partition by holding the “CMD+R” keys together during boot up. Every Mac running OS X Lion and later has a small (650MB) hidden recovery partition called Recovery HD located on your Mac’s internal hard drive which is reserved for common utilities such as Time Machine Backup,Terminal utility, Disk Utility, Hardware Diagnostic tool and other built in set of utilities. This article will help you create a Mac OS X or macOS recovery USB drive to use in case of disaster or no boot from internal hard drive.

Use diskutility to create mac os usb