Periodically, that monolithic image would be updated for new versions of macOS and apps, and then used going forward for new Macs and clean reinstalls.Īpple is now explicitly warning against using monolithic system imaging when upgrading or updating macOS High Sierra. Imaging, or more specifically, monolithic system imaging, involves creating a disk image of the canonical Mac, complete with site-specific settings and apps, and then restoring that image onto the boot drive of a new Mac. Monolithic System Imaging Changes - Historically, many organizations have long relied on imaging as a way of setting up new Macs. More generally, this new approach to firmware updates means that you can’t use monolithic system imaging to upgrade a Mac to a new version of macOS. You can install High Sierra via the macOS Installer, by creating a bootable installer, from within macOS Recovery, and via a NetInstall image created by System Image Utility (available with macOS Server). You cannot install High Sierra on a Mac that’s connected via Target Disk Mode.įirmware updates can’t be done on external devices connected via Thunderbolt, USB, or Firewire. ![]() This isn’t new, but is more important because of APFS. ![]()
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