The disk format should be Mac OS X extension (Journaled). GUID Partition Map. Partition name: bootpartition (this name is used in this example, you can customize it, please note that bootpartition in the terminal command below should also be changed to your customized name).

  • If your Mac won't boot up normally, you can set it to boot from a different drive, such as a USB stick containing macOS installation files in bootable format. The drive will have to contain a version of the OS that is compatible with the Mac. As long as you have the bootable installation USB, you can start your Mac from the USB by accessing the.
  • Clover Boot Disk is the name after you have a USB bootable via Clover. I have not tested on the official MAC. It works for Hackintosh machines. Clover Boot Disk supports both Legacy BIOS and UEFI modes, because Clover supports both modes. This article does not instruct you to use Clover Bootloader, as well as install macOS.
  • Restart in OS X from Boot Camp. If you have started up your Mac in Windows using Boot Camp, you can use the Boot Camp system tray to switch your startup disk default back to OS X. In Windows, click the Boot Camp icon in the system tray. From the menu that appears, choose Restart in OS X. Start from OS X Recovery.
  • Restart your Mac and hold down Command + R to start recovery, or press and hold OPTION. Select “Recovery HD” from the start menu. On the Mac OS X Utility screen, select “Disk Utility”. Select a boot volume or partition from the left menu and click the Repair tab. Repair Disk is now possible, correct the boot volume by clicking Repair Disk.

The idea behind a macOS Clean Install

When you install a new major version of OS X, or after some time has passed, it is a good idea to do a clean install (that is, to erase the disk you are installing OS X onto as part of the installation process).

Boot cd mac osMac

That will make your Mac run blazingly fast for a few months or more, and many people report that it fixes longstanding problems they’ve had too.

It used to be common practice to occasionally run a clean install, and then manually migrate all the files and settings over in order to get a completely fresh start. However, it has been shown in recent times that in the vast majority of cases if you simply run a clean install, then duplicate your old home folder to your new disk, you will get all of the same advantages as a clean install followed by manual migration, with a small fraction of the effort.

Mac Clean Install Procedure

Here is the clean install procedure which can be performed at least every time a new version of macOS is released:

  1. Download the macOS installer from the App Store. You can download macOS Big Sur by clicking here.
  2. Backup all the data to an external disk with a clone. Two options are to use Duplicate (a free utility which can copy and paste an entire bootable volume), or Mac Backup Guru (a paid, fully featured backup utility with unique incremental backups capability) for that.
  3. Create a bootable USB Installer with Install Disk Creator and boot from it. Erase the startup disk and install macOS onto it. Boot up from this newly created startup disk.
  4. Note: The Finder’s built-in “Copy” and “Paste” will not work for the following.
    Go to the backup disk and use Duplicate (free) or Mac Backup Guru to right-click and select Copy on the home folder (eg: External Backup/Users/Bob) and then Paste on the Macintosh HD/Users folder on the startup disk. This migrates all of your personal data and settings to your new home folder.
    Then migrate the applications by selecting Copy on the External Backup/Applications folder on the backup disk then Paste on the startup disk (eg: Macintosh HD). This will copy all of the applications which are present on the backup disk but not present on the startup disk to your new Applications folder, and automatically skip any applications which are already on the startup disk.

Create Mac Os Boot Disk From Windows

At this point, after a reboot and some minor adjustments (the Dock may not have your previous configuration for example, if you did this while logged into the same user account as you just updated), your new OS should be indistinguishable from your previous one, while being faster and smaller due to reduced clutter.