![]() Just drag the /Volumes/ folder from Finder into the box.Īfter that and a restart, I was able to create the install media. This error occurs when you try to create an install disk, and a false mount is created, which is a folder with the same name as your install drive. I have no idea why Spotlight would want to index a removable device, but you can disable it in System Preferences -> Spotlight -> Privacy. In my case, it was mds and mds_stores, which are related to Spotlight indexing. To find out which application is using the drive, use the following command in Terminal sudo lsof D "/Volumes/". Sometimes Finder would hang when trying to eject, sometimes there would be a message about some program using the drive. In addition to the "Error erasing disk" message, my USB flash drive would not eject/unmount. The accepted answer "make sure the USB drive is not currently used by the system or your apps" is correct, though in my case, I had to dig a little deeper. I had the same problem with the macOS Monterey createinstallmedia script. If the problem is minor you can start in Safe mode that will correct some minor issues. You can open the terminal and use the fsck -fy to check repair the disk. If the MBP boots in the Recovery mode using cmd-r then follow that process to restore your OS installation, or use the Disk Utility to check/repair the disk. If problems reoccurs get another USB stick with minimum of 8 Gig capacity (not partitioned). 30%.100%.Ĭopying installer files to disk…(this part can take 30 minutes) sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia -volume /Volumes/Mavericks -applicationpath /Applications/Install\ OS\ X\ Mavericks.app -no interaction.Įrasing Disk: 0%. This can be done from the Erase tab within the app make sure the USB drive does not have multiple partitions (that can happen, so turn to the Partition tab to verify and correct this). I used this proces to make a bootable USB:įormat it, using Disk Utility, as a Mac OS Extended (Journaled) drive, named Mavericks. To create a bootable USB you will need a Mavericks Installer package from Apple Store the 5.5 Gig file saved to MBA- but not run. Click on the arrow button under the disk icon.We are dealing with 2 different problems.Select the disk icon for the USB flash drive.Release the key when the Boot Manager screen appears.Immediately after the chime press and hold down the " OPTION" key.The bootable installer can be used to install the selected version of macOS. Diskmaker X was the famous go-to utility for creating bootable disks, but it doesnt. Wait for the return of the Terminal prompt signifying the process has completed. After selecting it, click on the Erase button along the top. You will be asked for your admin password. Sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ OS\ X\ Mavericks.app Sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ OS\ X\ Yosemite.app Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app Sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ macOS\ Sierra.app Sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume Sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume Paste that entire command line from below at the Terminal's prompt: Choose the appropriate command line (begins with "sudo") depending upon what OS X installer you want. Open the Terminal in the Utilities' folder. Click on the Apply button and wait for the Done button to activate.Set the Format type to Mac OS Extended (Journaled.) In the drop down panel set the partition scheme to GUID.Click on the Erase button in the Disk Utility toolbar.After Disk Utility loads select the drive (out-dented entry with the w/type and size info) from the side list.Open Disk Utility in the Utilities' folder.You will need an 8GB or larger USB flash drive that has been partitioned and formatted for use with OS X as well as an installer for the desired macOS version that you have previously downloaded from the App Store. Simply use the Terminal command by copying and pasting the command line for the version of macOS from the list below. Second, read this How To outline for creating a bootable macOS installer. The Apple method is:įirst, review this introductory article: Create a bootable installer for macOS.
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