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#CREATE A STARTUP DISK FOR MAC OS X HOW TO#
#CREATE A STARTUP DISK FOR MAC OS X MAC OS#
#CREATE A STARTUP DISK FOR MAC OS X INSTALL#
#CREATE A STARTUP DISK FOR MAC OS X DOWNLOAD#

Paste the copied command into Terminal, making sure that no double dashes ( -) were replaced by em dashes (-) press Return.

Warning: This step will erase the destination drive or partition, so make sure that it doesn’t contain any valuable data.

Launch Terminal (in /Applications/Utilities).

Select the text of the appropriate Terminal command below, and copy it:įor High Sierra: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ macOS\ High\ Sierra.app -nointeractionįor Sierra: sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ macOS\ Sierra.app -nointeraction.

#CREATE A STARTUP DISK FOR MAC OS X INSTALL#

(The Terminal command I provide here assumes that the drive is named Untitled.) Also, make sure that the High Sierra or Sierra installer (or at least a copy of it), called Install macOS High Sierra.app or Install macOS Sierra.app, respectively, is in its default location in your main Applications folder (/Applications).

Connect to your Mac a properly formatted 8GB (or larger) drive, and rename the drive Untitled.

Using createinstallmedia in Terminal to create a Sierra installer drive. But I suspect that the vast ( vast) majority of people installing macOS 10.13 High Sierra or 10.12 Sierra will have access to a Mac running 10.7 or later. The only real drawback to createinstallmedia is that it doesn’t work under OS X 10.6 Snow Leopard-it requires OS X 10.7 Lion or later. Using it requires the use of Terminal, but it works well, it’s official, and the procedure is easy enough: If you can copy and paste, you can do it. Starting with Mavericks, hidden inside the OS X installer is a Unix program called createinstallmedia, provided by Apple specifically for creating a bootable installer drive. (If you’ve read this paragraph too late, and the installer has already deleted itself after an installation, you just need to re-download High Sierra r Sierra from the Mac App Store-via the Purchases tab-before you can make your bootable installer drive.) The easiest way is createinstallmedia So if you plan to run the installer before making your bootable installer drive, first make a copy of the Installer in another folder or on another drive so you have a safe copy before creating the bootable installer, move the copy back to the Applications folder. However, if you run the installer-say, to install the OS-from that location, the installer will delete itself after installation finishes.

#CREATE A STARTUP DISK FOR MAC OS X DOWNLOAD#

Important: When you download the High Sierra or Sierra installer from the Mac App Store, it will be saved to your main Applications folder (/Applications) it must be in that location for the procedure below to work. Your macOS user account must also have administrator privileges.

#CREATE A STARTUP DISK FOR MAC OS X HOW TO#

Macworld has a nice tutorial that explains how to properly format the drive.

#CREATE A STARTUP DISK FOR MAC OS X MAC OS#

The installer drive must be formatted as a Mac OS Extended (Journaled) volume with a GUID Partition Table. To create a bootable High Sierra or Sierra installer drive, you just need the appropriate aforementioned installer and a Mac-formatted drive (a hard drive, solid-state drive, thumb drive, or USB stick) that’s big enough to hold the installer and all its data-an 8GB thumb drive is perfect. (Developers can get the current release version of High Sierra through the developer download site-scroll down to “Release Software.”) What you need You can get the latest version of the High Sierra or Sierra installer from the Mac App store.

How do I get the High Sierra or Sierra installer?

2 Here’s this year’s version, for both macOS High Sierra (10.13) and macOS Sierra (10.12), of my annual how-to guide. 1 It’s great for installing the OS on multiple Macs, because you don’t have to download the ~5GB installer onto each computer, and it serves as a handy emergency disk if your Mac is experiencing problems. I’ve long recommended creating a bootable installer drive-on an external hard drive, thumb drive, or USB stick-for the version of macOS you’re running on your Mac.