There are two methods for creating the bootable installer. Although I prefer using a USB flash drive as the destination for the installer, you can use either method to create a bootable version of the OS X Yosemite installer on any bootable media, including hard drives, SSDs, and USB flash drives.
Normally you can’t obtain bootable media of macOS. OS X was a different story, but also you had to pay for those versions. As an owner of a MacBook Pro, it’s slightly unsettling that I wouldn’t necessarily be able to plug in a bootable USB or insert a DVD with the macOS installer image in the event that I needed to re-install my OS because my SSD ate the dust, or something. This guide will also be useful for those who can run Virtual Machines of macOS in environments like VirtualBox etc.
To abide with Apple’s terms of use, you must go through official channels to obtain the macOS installer. This means you actually need a Mac or a MacBook to create this bootable ISO. Overview of how to create a bootable macOS 10.13 High Sierra ISO image:. Download macOS from app store. Open Terminal. Run commands. Rename to.ISO Download Click this link to open the macOS High Sierra download in the App Store Especially if you’ve already upgraded to high sierra and deleted the installer data (with CleanMyMac etc) you will need to download this again before proceeding with this article.
![Bootable Bootable](https://www.windowscentral.com/sites/wpcentral.com/files/styles/xlarge/public/field/image/2016/02/boot-camp-assistant-2.jpg?itok=kw5F6xtK)
Run commands in Terminal Run these commands one at a time ( Update 2/6/2018:: I changed the 5130m to 5200m based on feedback from the comments). Bernard November 24, 2017 at 1:02 pm Merci beaucoup Tyler, however at the last but one step (hdiutil detach) I got an error saying that disk3, i.e. “Install macOS High Sierra” is busy and cannot be unmounted. Have I done something wrong? Mac-pro-de-bernard-2: bernardbaz$ hdiutil create -o /tmp/HighSierra.cdr -size 5200m -layout SPUD -fs HFS+J. Created: /tmp/HighSierra.cdr.dmg mac-pro-de-bernard-2: bernardbaz$ hdiutil attach /tmp/HighSierra.cdr.dmg -noverify -mountpoint /Volumes/installbuild /dev/disk3 Applepartitionscheme /dev/disk3s1 Applepartitionmap /dev/disk3s2 AppleHFS /Volumes/installbuild mac-pro-de-bernard-2: bernardbaz$ sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/installbuild Password: Ready to start. To continue we need to erase the volume at /Volumes/installbuild.
If you wish to continue type (Y) then press return: Y Erasing Disk: 0% 10% 20% 30%100% Copying installer files to disk Copy complete. Making disk bootable Copying boot files Copy complete. Mac-pro-de-bernard-2: bernardbaz$ mv /tmp/HighSierra.cdr.dmg /Desktop/InstallSystem.dmg mac-pro-de-bernard-2: bernardbaz$ hdiutil detach /Volumes/Install macOS High Sierra hdiutil: couldn’t unmount “disk3” – Resource busy mac-pro-de-bernard-2: bernardbaz$. November 16, 2017 at 11:30 am You’re probably forgetting a step which isn’t the most clear.