Use a system cleaning utility such as OnyX to clean up as many system settings as you can.There won't be many because most are user specific. Use an app deleting utility such as TrashMe to catch as many of the app's preferences as you trash them.Create a new temporary user account with Admin privs & delete all of your old ones including the home folders.The best you can do is delete user accounts & home folders and remove any Applications that didn't come with it by default, but chances are you're going to leave behind some traces in your system Library folder at least. Once you have formatted the USB flash drive with a GPT partition, you can use the instructions mentioned above to use TransMac to create a bootable media, but this time, skip steps 5 through 10 and continue on step 11.Īfter the process, which could take up to an hour, connect the USB flash drive, turn on your Mac by holding down the “Option” key, and select the USB drive to install macOS.You won't be able to get it back to 100% pre-used state without the discs. Type the following command to create a primary partition and press Enter: create partition primary create partition primary Type the following command to convert the drive to the GPT style and press Enter: convert gpt Type the following command to clean the drive and press Enter: clean In the command, change “4” to the number corresponding to the USB flash drive. Type the following command with the number assigned for the USB flash drive and press Enter: select disk 4 Type the following command to view all drives connected to your computer and press Enter: list disk Type the following command and press Enter: diskpart Search for Command Prompt, right-click the top result, and select the Run as an administrator option. To create a GPT partition on a removable drive, use these steps: However, this time, you should follow these steps to use the Diskpart command-line utility on Windows 10 (or 11) to create the appropriate GPT partition, and then follow the above instructions. In this case, you may need to redo the entire process. If the USB flash drive is not working with TransMac, it could still be a partition problem. Create a GPT partition on a USB flash drive Once you complete the steps, insert the USB flash drive on your Mac to install, reinstall, or upgrade the operating system to the latest macOS version (Ventura, Monterey, Big Sur, Catalina, or Mojave). Select the “.dmg” file with the macOS installation files. Right-click the USB flash drive and select the “Restore with Disk Image” option from the left pane.Ĭlick the Yes button to confirm the erase of the USB flash drive data. If this is the case, the chances are it’s using an MBR partition, and the USB drive needs a GPT partition to work on a Mac.Ĭlick the Yes button to format the drive on the warning message.Ĭonfirm a name for the drive. Quick note: You want to perform this task before creating the bootable media because there is a good chance that the drive was formatted using a Windows device. To create a bootable USB drive with macOS, use these steps:ĭownload and install TransMac on Windows 10.
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