![]() You may find this easier to do in Sierra, before upgrading. If you’re going to be using the drive to upgrade Macs from earlier versions of macOS, don’t initialise it using the new APFS file system, but stick to a more traditional format. ![]() Initialise the external drive, such as a USB memory drive. Soon after the release of High Sierra, third-party tools should become available to make this even simpler, but for the moment the following is Apple’s recommended method. One supported method of installing High Sierra which is ideal when you want to format its startup disk, or want to install it on multiple Macs, is to make a bootable installer on an external drive, and install from that. ![]() If you have the first version, which was only 19.9 MB, you will need to trash that, and download the revised installer which is about 5.2 GB. NOTE: Although Apple has updated its information, the following instructions will not work unless you have the second version of the Install macOS High Sierra app installed. ![]()
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