Use the software from internet recovery to install on the newly created partition or external hard disk.ģ.When completed, pick a system newer than the original system as needed to run your software: Internet Recovery will let an ethernet plugged in computer or adapted computer obtain the original system that shipped with it. Partition a physical disk in Disk Utility on Mac - Apple SupportĢ.Run Internet Recovery, not to be confused for simple recovery, which just recovers the current system. Partition the hard disk with Disk Utility for the appropriate format and size (you'll want at least 50 GB free, if you can't have 50 GB free, it is best to use an external hard drive vis USB or Firewire or Thunderbolt that has its own power source and is not direction from the computer):.Knowing the above limitations, here's the way to do it with 10.7 and above, if your Mac is newer than July 22, 2011: It is better if you downgrade, to have a clone backup of the older system to fall back to, that way avoiding incompatibilities of newer libraries. Also note, if you upgrade your libraries to a newer system, such as an Apple Photos library, only the raw photos will be readable by the older system, and not the libraries, tags, albums and favorites. If you are just going to flip booting back and forth, only the first step is needed, as the Option key booting will choose the operating system that is loaded regardless of the drive formatting. And an extra step to make 10.13 or later readable to the 10.12.6 booted system would be to clone backup the newer system, and wipe and reformat the newer system's drive as HFS Extended Journaled. An extra step to make 10.13 or later readable from 10.12.6 or older systems would be to make sure the 10.12.6 or older system is to wipe and formatted HFS Extended Journaled before installing 10.12.6 or earlier. With 10.13's release Apple introduced APFS, which is not readable by older operating systems.
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