These are not installers, but are individually bootable full installs of each operating system. I do a lot of testing, so I have an external drive, which has 14 different bootable systems, from Leopard (OS X 10.5.8) to Ventura (macOS 13.3.1), all on the same drive. I do similar a few times a week, and it's pretty straightforward. Both the installer AND your useful system can be on the same device, (separate partitions), should you want to do it that way. "Hoops to jump through"? You need an installer, and you need a volume to use as the destination for that installer. Then, boot to that installer, and install your system on the larger partition. You can buy 256GB drives for less than $25 these days, and an external enclosure can be less than $10, so possible to make your own boot system + installer, both on the same device for less than $35.Ĭreate the bootable macOS installer on the small (16GB) partition. I have a 256GB NVME that would work really well for that, so that would be left with about 240GB for the bootable system - your various testing apps, I suppose. The other partition would be the rest of the drive. Make two partitions on the drive - one for the system installer: 16GB is good. If you have just a few jobs for that drive (testing, maybe a speedtest of some kind), then you wouldn't need much space, maybe begin with a 250GB device (in real life, those would range from 240GB to 256GB, depends on manufacturer The space available will be shown for each volume that might be available to you.Įxternal storage device: I would use a m.2 NVME drive. (hint: the volume you want will NOT be named Install macOS Ventura, so choose a different volume. The volume should be considerably larger than around 15GB, and will be the volume that you want to use for the new system install. But, when you are booted to the installer, and you begin the macOS install, look for the screen where it asks you to select a destination for the install. Be sure to erase with the GUID scheme, and then choose either Mac OS Extended, or (maybe better at this point) APFS, to prepare your destination drive for the macOS install.īottom line, it sounds like you are trying to install on that 15GB volume, which is great when you a making the installer, and that is about the space that needs. I did just test this on latest Ventura installer last week, and the change to APFS happened during the install.īut, probably better to begin with APFS, as you are erasing anyway. Again, if the installer encounters a destination volume formatted Mac OS Extended, it will automatically change that to APFS during the install. You can begin by formatting that destination volume as APFS, or you could also format as Mac OS Extended (Journaled). Note: the macOS installer will automatically change the format of the destination volume to APFS. That will then launch the installer, where you will get to select another volume as the destination for the install.Īnd, as you are booted to the installer volume (which needs 13GB-14GB of space, just for the installer) you have to also choose the destination volume for your install. If you are then booting to that installer, you would need to choose "Reinstall macOS". Sounds like you are making a bootable installer.(?) Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.If you can't start up from the bootable installer, make sure that Startup Security Utility is set to allow booting from external or removable media. Then click the onscreen arrow or press Return. Select the volume containing the bootable installer.Release the Option key when you see a dark screen showing your bootable volumes.Turn on your Mac, then immediately press and hold the Option (Alt) key.When the macOS installer opens, follow the onscreen installation instructions.Select the volume containing the bootable installer, then click Continue.Turn on the Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.(A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.) Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.Use the bootable installer Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps: Sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume
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