Mac Os Clean Install Fusion Drive

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  1. Mac Mini Fusion Drive
  2. Mac Os Clean Install Fusion Drivers
  3. Imac Clean Install Fusion Drive

Backup your Mac As you already know, installing any OS completely erases your startup drive. Therefore, if you would not like to lose your current installation, make sure that you have backed up your device before proceeding with any of these steps. This can be done with a cloning or back up app to External Hard Drive. Then select the Fusion Drive and wipe it with this mode. All the data on the Fusion Drive will be permanently erased. But, if the Mac OS is installed on the Fusion Drive, the Fusion Drive can’t be formatted. DoYourData Super Eraser for Mac also offers another modes to permanently erase data from Fusion Drive on Mac. Shred files from Fusion Drive. Dec 26, 2017  If you booted from a functioning recovery partition, click the “Reinstall macOS” button. The installation process will begin. If you booted from an USB disk, click “Continue” to advance to the installer. You’ll be asked which hard drive you want to install to. A clean install involves erasing the boot drive in your device — a hard drive, Fusion drive, or SSD — then installing the operating system onto that boot drive. Once that clean install of macOS Sierra is done, a previously-made backup of personal files is transferred back to the machine and apps are reinstalled. Jun 08, 2019  A clean install of macOS Mojave 10.14 on a fusion drive Downloading MacOS Mojave from the App Store. Get macOS Mojavein the App store. The download is just over 6GB. Creating the USB installer. Insert a USB stick of at least 8GB.

Reinstall from macOS Recovery

macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu , which is also available in macOS Recovery.

1. Start up from macOS Recovery

To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on your keyboard. Release the keys when you see an Apple logo, spinning globe, or other startup screen.

Command (⌘)-R

Reinstall the latest macOS that was installed on your Mac (recommended).

Option-⌘-R

Upgrade to the latest macOS that is compatible with your Mac.

Drive

Shift-Option-⌘-R

Reinstall the macOS that came with your Mac, or the closest version still available.

You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.

When you see the utilities window, you have started up from macOS Recovery.

2. Decide whether to erase (format) your disk

You probably don't need to erase, unless you're selling, trading in, or giving away your Mac, or you have an issue that requires you to erase. If you need to erase before installing macOS, select Disk Utility from the Utilities window, then click Continue. Learn more about when and how to erase.

3. Install macOS

When you're ready to reinstall macOS, choose Reinstall macOS from the Utilities window. Then click Continue and follow the onscreen instructions. You will be asked to choose a disk on which to install.

  • If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
  • If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
  • If the installer is for a different version of macOS than you expected, learn about macOS Recovery exceptions.
  • If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.

Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.

If your Mac restarts to a setup assistant, but you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.

macOS Recovery exceptions

The version of macOS offered by macOS Recovery might vary in some cases:

  • If macOS Sierra 10.12.4 or later has never been installed on this Mac, Option-Command-R installs the macOS that came with your Mac, or the closest version still available. And Shift-Option-Command-R isn't available.
  • If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might offer only the macOS that came with your Mac, or the closest version still available. You can upgrade to a later version afterward.
  • If your Mac has the Apple T2 Security Chip and you never installed a macOS update, Option-Command-R installs the latest macOS that was installed on your Mac.
  • If you just had your Mac logic board replaced during a repair, macOS Recovery might offer only the latest macOS that is compatible with your Mac.

If you can't get macOS Recovery to offer the installer you want, you might be able to use one of the other ways to install macOS.

Other ways to install macOS

  • You can also install macOS from the App Store or Software Update preferences. If you can't install macOS Catalina, you might be able to install an earlier macOS, such as macOS Mojave, High Sierra, Sierra, El Capitan, or Yosemite.
  • Or create a bootable installer disk, then use that disk to install macOS on your Mac or another Mac.

Fusion Drive, a storage option on some iMac and Mac mini computers, combines a hard drive and flash storage in a single volume for improved performance and storage capacity. If your Fusion Drive appears as two drives instead of one in the Finder, it's no longer working as a Fusion Drive. This can happen after replacing either drive of your Fusion Drive, or using software to intentionally split them into separate volumes.

You can continue using the two drives independently, or follow these steps to regain the benefits of having the single logical volume of a Fusion Drive.

Mac Mini Fusion Drive

Before you begin

If you're not sure that your Mac was configured with a Fusion Drive, or that the drive has been split:

  1. Disconnect any external storage devices from your Mac.
  2. Choose Apple menu  > About This Mac, then click Storage.
    • If you see a drive labeled Fusion Drive, your Fusion Drive is working and this article doesn't apply to you.
    • If you have a Fusion Drive that has been split, you should see two drives. One of them should be labeled Flash Storage, with a capacity of 24GB, 32GB, or 128GB. The other should be at least 1TB.

Use Terminal to create a Fusion Drive again

These steps permanently delete all data stored on the drives that make up your Fusion Drive. Make sure that you have a backup before continuing.

If you're using macOS Mojave or later

  1. Turn on your Mac, then immediately press and hold Command-R to start up from macOS Recovery. Release the keys when you see the Apple logo or spinning globe.
  2. When you see the macOS Utilities window, choose Utilities > Terminal from the menu bar.
  3. Type diskutil resetFusion in the Terminal window, then press Return.
  4. Type Yes (with a capital Y) when prompted, then press Return.
  5. When Terminal indicates that the operation was successful, quit Terminal to return to the macOS Utilities window.
  6. Choose Reinstall macOS, then follow the onscreen instructions to reinstall the Mac operating system. Your Mac restarts from your Fusion Drive when done.

Mac Os Clean Install Fusion Drivers

If you're using macOS High Sierra or earlier

Imac Clean Install Fusion Drive

  1. Turn on your Mac, then immediately press and hold Command-R to start up from macOS Recovery. Release the keys you see the Apple logo or spinning globe.
  2. When you see the macOS Utilities window, choose Utilities > Terminal from the menu bar.
  3. Type diskutil list in the Terminal window, then press Return.
  4. Terminal displays a table of data about your drives. In the IDENTIFIER column, find the identifier for each of the two internal, physical drives that make up your Fusion Drive. Usually the identifiers are disk0 and disk1. One of them should be 128GB or less in size. The other at least 1TB in size.
  5. Type the following command, replacing identifier1 and identifier2 with the identifiers you found in the previous step. Then press Return.

    Example: diskutil cs create Macintosh HD disk0 disk1

  6. If you get a disk unmounting error, enter diskutil unmountDisk identifier, using the first identifier you gathered previously. Then enter same command again using the second identifier. Then retry the command in step 5.
  7. Type diskutil cs list, then press Return.
  8. Terminal displays additional data about your drives (volumes). Find the string of numbers that appears after ”Logical Volume Group” for the volume named Macintosh HD. It's a number like 8354AFC3-BF97-4589-A407-25453FD2815A.
    Example:
    +-- Logical Volume Group 8354AFC3-BF97-4589-A407-25453FD2815A
    |
    | Name: Macintosh HD
  9. Type the following command, replacing logicalvolumegroup with the number you found in the previous step. Then press Return.

    Example: diskutil cs createVolume 8354AFC3-BF97-4589-A407-25453FD2815A jhfs+ Macintosh HD 100%

  10. When Terminal indicates that the operation was successful, quit Terminal to return to the macOS Utilities window.
  11. Choose Reinstall macOS, then follow the onscreen instructions to reinstall the Mac operating system. Your Mac restarts from your Fusion Drive when done.