Connect the external hard drive to the Mac computer.I purchased a used 2018 Mac mini desktop and wanted to put a fresh installation of the latest macOS 10.15 Catalina on it. After creating a bootable external hard drive, follow the steps below to set it as boot device. Boot Windows on your Mac from external hard drive. The installer software will take up over 5GB. Just about any type of USB external drive will work: thumb drive, hard drive, or SSD.Launch the Disk Utility app which is located in Applications > Utilities. Find a USB drive, of 2GB capacity or more, and plug it into the Mac. In order to create a bootable USB using Boot Camp.The first part of the process is to format a USB drive such that it is bootable on a Mac.
Create A Boot Usb Drive Mac OS El CapitanORG: Download Mac Software, App &.You will need a Mac to download macOS Catalina you can download Catalina from The Mac Go. Create the Bootable Mavericks USB Drive.Then Right-click on that flash you want to create bootable USB for Mac OS El Capitan then select Restore with Disk Image. If you change this the next step won’t work. Ensure that the format is Mac OS Extended (Journaled) IMPORTANT Leave the name as Untitled. This will allow you to quickly install the OS on Intel and M1 Macs.Note: The instructions below are the same for macOS 10.13 High Sierra and macOS 10.14 Mojave.Plug the USB Drive in to your Mac and open Disk Utility (found under applications / utilities in finder) Select the USB Drive. Monterey USB Installer drive How to create a macOS 12 Monterey USB Boot Disk. Plug the USB flash drive into your Mac. You don’t need to delete the existing content on the drive because we will blow it all away in a subsequent step.If the USB flash drive is not already formatted as “Mac OS Extended (Journaled)”, format it like so: For example, you can move the “Install macOS Catalina” application to the “~/Downloads” directory and run it from there.Because macOS Catalina is 8.4GB in size, you will need a 16GB USB flash drive. If the installer automatically launches, just close it.Note: If you plan to run the installer first to update your current macOS version to Catalina, you will want to move the “Install macOS Catalina” application out of the “/Applications” directory otherwise, the installer will delete itself from the “/Applications” directory when the upgrade completes. It will be saved to the “/Applications/Install macOS Catalina” location. Click the “Erase” button at the bottom. If available, select “Master Boot Record” for “Scheme”. Select “Mac OS Extended (Journaled)” for “Format”. Input a name like “Catalina” (this name will be overwritten later). Click on the “Erase” tab (or button at the top). Then on restart, the Mac should boot from the USB flash drive. 100 %Install media now available at "/Volumes/Install macOS Catalina"The above process took 20-30 minutes using my Kingston USB 2.0 flash drive.Note: Apple’s How to create a bootable installer for macOS page suggest using the “Startup Disk” configuration (under “System Preferences”) to select the USB flash drive as the startup drive. 100 %Copying to disk: 0 %. (USB 2.0 and large capacity drives may take longer.) After the format completes, the partition will be mounted under “/Volumes/Catalina” (or whatever name you selected above).To create a bootable USB macOS Catalina installer, run the “Terminal” application and this command:Erasing disk: 0 %. The format operation may take several minutes to complete. The USB flash drive should then appear after a few seconds. Note: If you don’t see the USB flash drive’s “Install macOS Catalina”, try removing and re-inserting the USB flash drive while viewing the Startup Manager screen. (The internal hard drive may not be visible if it does not have a valid, bootable partition installed.) You should see one or more icons, one of which should be called “Install macOS Catalina” for the USB flash drive. While holding the “option” key down, turn on the Mac to display the Startup Manager. App for mac hebrew dictionaryYou can release the keys when you see the Apple logo. Hold down “Command-R” (hold down both the “Command ⌘” and “R” keys) when you start the Mac to launch macOS Recovery. Attempting to boot from a USB flash drive will result in a “Security settings do not allow this Mac to use an external startup disk” warning message.To allow booting from the USB flash drive, do the following: Be patient.On a newer Mac with the T2 security chip, booting from an external drive may be disallowed by default. Sometimes the progress bar may appear to be frozen or the screen will go black for a minute or two. ![]() It looks the same as the “macOS Recovery” screen with one difference. On restart, follow the directions in the previous section to boot from the USB flash drive.When the installer finishes loading, you will see a “macOS Utilities” screen appear. Quit the macOS Utilities to restart the Mac. (You can change the option back to the default “Full Security” afterwards.) If the Mac won’t have access to the Internet (either by wire or wirelessly) when installing macOS Catalina, make sure to select either the “Medium Security” or “No Security” option under the “Secure Boot” section. In the Startup Security Utility, under “Allowed Boot Media”, select the “Allow booting from external or removable media” option. On the left-hand pane, select the internal hard drive (not the partition under it, if any). Select the “Disk Utility” option and click the “Continue” button on the bottom to launch the “Disk Utility” application. The “Install macoS” option will install the macOS Catalina version on the USB flash drive.Before installing macOS, I wanted a clean slate so I erased the internal hard drive like so: In “macOS Recovery”, the “Reinstall macOS” option would just re-install the same version of macOS. The “macOS Catalina” installer’s splash screen will appear. Click on the “Install macOS” option and click the “Continue” button. You can configure the wireless network by clicking on the wireless icon at the top-right corner of the macOS Utilities screen.Back at the “macOS Utilities” window, do the following to start the macOS Catalina installation: The SSD (Solid State Drive) format took less than a minute to complete.Warning: If your Mac has a T2 security chip and you left the “Full Security” option configured in the Startup Security Utility, make sure that Internet access (wired or wireless) is available before starting the macOS Catalina installation. Click the “Erase” button at the bottom. Keep the default “Macintosh HD” name or input a new one. I think there were a couple of reboots in-between. Select the internal hard drive and click the “Install” button.My Mac mini took 20-30 minutes to complete the macOS Catalina installation. A popup confirmation window will appear click on the popup’s “Agree” button. Click on the “Agree” button to agree to the license. And later, this warning message no longer appeared on bootup.Enjoy your fresh installation of macOS 10.15 Catalina. Thankfully, the monitor works correctly after the bootup completes. During the initial bootup screen, the monitor shows a blank screen with a message, “The current input timing is not supported by the monitor display”. Be patient and give the process an hour or more to complete.If you run into problems installing macOS Catalina, check the “What Does Giving Up Mean?” section (at the bottom) of Install macOS Sierra Using Bootable USB Flash Drive for possible solutions.Note: macOS Catalina seems to have an issue with my Dell 24in U2410 monitor.
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