Tinkertool guide install#TinkerTool System can guide you through the process of creating macOS install media. The medium can also fully replace a recovery system: It contains all components of the recovery OS, so you can use Disk Utility, Terminal, or the “complete restore” feature of Time Machine for maintenance purposes if the main OS is no longer working correctly. Such a medium behaves like a classic operating system DVD: The computer can be started from it, and you can install a full copy of the operating system without the need for an Internet connection. For such cases, all Mac operating systems as of OS X 10.9 or later support a feature to create standalone install media. In cases where all disk drives of your Mac have been erased or have become unusable, you can also start the recovery system by a NetBoot feature, so the emergency system is directly loaded from an Apple-provided Internet server.Īll these emergency procedures won’t help if you need to install a new operating system on a Mac which has no Internet connection, or which should not have such a connection for security reasons. Depending on the speed of your Internet line, a full download may take more than 4 hours, however. The recovery system allows you to download a copy of the full operating system from the Internet again when you have lost it. There is only a small mini operating system for emergency cases stored in a recovery volume, which is installed in parallel for each macOS installation on your Mac and for each Time Machine destination disk. This means there is no longer a tangible medium holding a copy of the operating system which could be used in case of emergency when the running copy of the OS on your computer was damaged or erased. The Pane Install Media Operating System InstallationĪs of summer 2011, Apple distributes operating systems only as downloads of installer Apps from the Mac App Store, or together with new Macs.
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