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In the case of Sierra, 12GB is recommended as the minimum requirement. USB Stick / External Hard Drive: If you are planning to use a USB for downloading the bootable version of the installer, make sure that it is 8GB in size or larger than that.What Do You Need Before Creating Your Bootable Drive?īefore you begin the process, you will need the following: A bootable installer can allow you to install an earlier version of macOS and also let you temporarily boot into the previous version of the macOS.When you have a bootable installer, it ensures that you are well guarded in an emergency scenario by making use of some of its helpful utilities.You can also use this function for other troubleshooting issues as well.
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CREATING A MAC FLASH BOOT DISK FOR HIGH SIERRA HOW TO
How to create a bootable macOS High Sierra installer drive Put the macOS High Sierra installer on an external USB thumb drive or hard drive and use it to install the operating system on a Mac. In this video I will show you how to create a bootable USB Flash Drive for macOS Sierra, and will also show you why you need it and how to use it in the futu.