Results: nex-macpro2019:MacOSApp nex$ sudo. This process will take some time, depending on the speed of the disk you're writing to. Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/BigSur Write the installer to the mount point:.BigSur.dmg -noverify -mountpoint /Volumes/BigSur Results: nex-macpro2019:MacOSApp nex$ hdiutil attach. Please note that all of the commands are ran under the folder/directory /Volumes/BigDrive/MacOSApp BigSur -size 13000m -layout SPUD -fs HFS+JĬreated: /Volumes/BigDrive/MacOSApp/BigSur.dmgĭrwxr-xr-x 8 nex staff 256B 31 Dec 15:55. Nex-macpro2019:MacOSApp nex$ hdiutil create -o. 13000m - size in megabytes size of the Big Sur installer is 12.24 GB, or translated to megabytes, it's 12240 megabytes 13000m virtual disk size should allow for any additional headspace needed.BigSur - location where you want to create the virtual disk The following parameters are customizable, depending on the location and the size of the installer: BigSur -size 13000m -layout SPUD -fs HFS+J app file to ISOĬreate a virtual disk for the installation media: Here are the steps needed to convert the. app file that needs to be converted to ISO if you want to use it in a virtualization software. Mv ~/Desktop/BigSur.cdr ~/Desktop/BigSur.isoĪnd voila!! You have the image file on your desktop.As of macOS Mojave, Apple no longer provides a DMG file to install the macOS, it only provides an. Hdiutil convert /tmp/BigSur.dmg -format UDTO -o ~/Desktop/BigSur.cdr Rename and move to Desktop Alternatively, you can open the finder, right-click the mounted image and force eject. Hdiutil detach /volumes/Install\ macOS\ Big\ Surįor some reason, I got the “couldn’t unmount “disk3” – Resource busy” message. the first step config is incorrect” Unmount the Image
“ /Volumes/BigSur is not large enough for install media. You can always return to the first step if encounter such an error. I encountered the message below as I set up an insufficient size at the first step. Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/BigSur -nointeraction
Hdiutil attach /tmp/BigSur.dmg -noverify -mountpoint /Volumes/BigSur Create macOS Installer The same rule applies to the remaining commands. As I am creating BigSur image, so I name it BigSur. You can figure it out from the download size. Pay attention to the bold argument above, it’s the size I provided for Big Sur in MB. Hdiutil create -o /tmp/BigSur -size 14000m -volname BigSur -layout SPUD -fs HFS+J The steps are very straightforward to create the ISO file, you can start it by opening Terminal and copy the commands below Create Disk Image Big Sur is available in App Store Create ISO File
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