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Fusion Drive Not Showing Up or Not Working on Mac? Fixed!

Updated on Friday, May 24, 2024

iBoysoft author Jenny Zeng

Written by

Jenny Zeng
Professional tech editor

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Jessica Shee

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Fix Fusion Drive Not Showing Up or Not Working on Mac

Summary: This article discusses the typical situations of Fusion Drive not showing up on Mac and the appropriate solutions. You'll also learn what a Fusion Drive looks like in Disk Utility and how to easily recover inaccessible data on a Fusion Drive. 

Fusion Drive not showing up on Mac

Table of Contents:

Apple Fusion Drive ProblemsSolutions
Fusion Drive not showing up on the desktop or in the Finder1. Finder > Preferences/Settings.
2. Tick "Hard disks" in the General tab.
3. Tick "Hard disks" in the Sidebar tab.
Fusion Drive not showing in Disk Utility (Bootable Mac)1. Open Disk Utility.
2. Click View > Show All Devices.
Fusion Drive not showing in Disk Utility (Unbootable Mac)Fix 1: Reset the Fusion Drive.
Fix 2: Split the Fusion Drive and then reset it.

How to recover data from the Fusion Drive that's not showing up/working on Mac?

Oftentimes, when your Fusion Drive is missing or not working, you lose access to the data on your iMac or Mac mini. But all hope is not lost. With a data recovery tool like iBoysoft Data Recovery for Mac, you can get back your photos, videos, audio, documents, emails, and other data from Recovery Mode.

Take the steps below to preview data on the malfunctioning Fusion Drive for free:

  1. Shut down your Mac.
  2. Press the power button, then immediately press and hold Option + Command + R.
  3. Release the keys when you see the spinning globe.
  4. Ensure your Mac is connected to the internet.
  5. Choose Utilities > Terminal from the menu bar.
  6. Type the following command and hit Enter.sh <(curl http://boot.iboysoft.com/fdboot.sh)
  7. When iBoysoft Data Recovery for Mac opens, select your Fusion Drive and click "Search for Lost Data."
    Scan the Fusion Drive for lost data  
    If you have a split Fusion Drive, select "Fusion Drive" from the left pane. From there, the SSD and HDD should be automatically selected. If not, choose the responding drive yourself. Then click "Search for Lost Data." 
    Scan the split Fusion Drive for lost data
  8. When the scan is complete, you can filter and preview the files you want back. 
    Preview files on the Fusion Drive
  9. Plug in an external drive to store the recovered files.
  10. Select the files you want to restore, click the Recover button, and choose the external drive as the location. 
    Recover files from the Fusion Drive

Share the steps to benefit those who want to recover data from a Fusion Drive that's not working. Besides, this utility also helps you recover files from Fusion Drive in an unbootable iMac device without a hitch.

 

Fusion Drive not showing up on the desktop or in the Finder

If your iMac or Mac mini starts up normally but your Fusion Drive is not showing on the desktop or in Finder's left sidebar, you need to adjust Finder preferences. Here's how to do it:

  1. Open Finder.
  2. Click Finder > Preferences/Settings.
  3. In the General tab, tick the box next to "Hard disks" to show them on the desktop. 
    Show Fusion Drive on the desktop
  4. In the Sidebar tab, tick the box next to "Hard disks" to show them in the sidebar. 
    Show Fusion Drive in Finder

Now, you should see your Fusion Drive on the desktop or in the Finder if everything goes well.

 

Fusion Drive not showing in Disk Utility (Bootable Mac)

If your Mac boots up properly but the Fusion Drive seems to have disappeared from Disk Utility, it's because Disk Utility isn't set to show all devices. To view your Fusion Drive in Disk Utility, simply click View > Show All Devices.

Show Fusion Drive in Disk Utility

What should a Fusion Drive look like in Disk Utility?

Once you've configured Disk Utility to show all devices, Fusion Drive will appear at the top, as it's the virtual disk of your combined internal hard drives.

If your Fusion Drive is formatted with OS X Extended or Mac OS X Extended, Disk Utility displays the Fusion Drive at the top as a CoreStorage Logical Volume Group with the internal volume (usually named Macintosh HD) beneath it.

Fusion Drive formatted as Mac OS Extended Journaled in Disk Utility

If your Fusion Drive is formatted as APFS, Disk Utility displays the Fusion Drive at the top, followed by the APFS container, and then the internal volume Macintosh HD and maybe a Macintosh HD - Data volume if your Fusion Drive has macOS 10.15 Catalina and later installed.

Fusion Drive formatted as APFS in Disk Utility

Fusion Drive: This is the virtual Fusion Drive with the total capacity of the SSD and HDD. 

APFS container: This is part of the APFS file system that organizes data storage and allows space sharing for volumes within it.

Macintosh HD: The main storage volume on macOS 10.14 Mojave and earlier; the system volume that contains the operating system files and is designed to be separate from the Macintosh HD - Data volume for security and reliability on macOS 10.15 Catalina and later.

Macintosh HD - Data: The volume where your personal data, including apps, documents, photos, and other user-specific files, is stored. This is exclusive to macOS 10.15 Catalina and later.

 

Fusion Drive not showing in Disk Utility (Prohibitory symbol 🚫 or❓question mark folder)

If the Fusion Drive is not showing in Disk Utility in Recovery Mode, you may be encountering one of the following situations:

① You powered on your Mac, which has a Fusion Drive, but it didn't boot up as it should. So, you went to check the Fusion Drive in Recovery Mode and discovered that the Fusion Drive is missing in Disk Utility, and two independent drives emerged: one HDD and one SSD, or maybe one drive is missing and only the SSD or HDD appears.

② You tried to select the Fusion Drive as your startup disk, but it's not showing up.

③ You want to install macOS on the Fusion Drive, but it's not giving you the option.

Does any of this sound like you? If so, you're likely having a split Fusion Drive or an incorrectly formatted Fusion Drive.

To check whether your Fusion Drive is split, access Utilities > Terminal in macOS Recovery, then run the following command:

diskutil list

Terminal will provide information about the drives connected to your Mac. Check if there's a virtual volume that has the total storage of your SSD and HDD. It's a logical volume combined from two partitions, such as disk0s2 and disk1s2.

Check if your Fusion Drive is split in Terminal

If your Fusion Drive is separated, try solution 1. Otherwise, try solution 2. If the HDD portion of the Fusion Drive isn't visible, it has possibly failed. Make sure you have already recovered or backed up the data, then you can follow the steps below to fix a split fusion drive without losing data.

Solution 1: Fix the split Fusion Drive

When a Mac with a Fusion Drive boots to a circle with a line through it or a folder with a question mark, or the Fusion Drive is not showing up as a startup disk or OS installation destination, it means that it doesn't have a working operating system.

This usually occurs when the Fusion Drive is separated into two drives due to improper formatting, hardware changes, update failure, drive failure, etc. To fix the problem, you must reset the split Fusion Drive into one.

 Warning: Resetting the Fusion Drive will permanently delete all data stored on it. Ensure you have recovered the important data before proceeding.

To reset the Fusion Drive on macOS Mojave or later:

  1. Ensure your Mac is turned off.
  2. Power it on, then immediately press and hold Command + R.
  3. Release the keys when you see the Apple logo.
  4. Choose Utilities > Terminal from the menu bar.
  5. Type the following command into Terminal and press Enter.diskutil resetFusion 
    Reset Fusion Drive on macOS Mojave or later
  6. Type Yes when prompted, and then press Enter.
  7. Quit Terminal when the process is complete.
  8. In the macOS Utilities window, select "Reinstall macOS" and follow the onscreen instructions to reinstall the OS. 
    Reinstall macOS

 diskutil resetFusion not working? 

If the command diskutil resetFusion is not working, go back to Disk Utility and erase each of the drives with the proper file system (APFS for macOS Mojave or later and Mac OS Extended (Journaled) for macOS High Sierra or earlier), then retry the command.

To reset the Fusion Drive on macOS High Sierra or earlier:

  1. Ensure your Mac is turned off.
  2. Turn it on, then immediately press and hold the Command + R keys.
  3. Release the keys when the Apple logo appears.
  4. Choose Utilities > Terminal from the menu bar.
  5. Type the following command and hit Enter.diskutil list
  6. Note down the identifier of each internal, physical drive that makes up your Fusion Drive. (E.g., disk0 is the SSD with 128GB or less in size and disk1 is the HDD with at least 1TB in size.) 
    Check the identifier of the split Fusion Drive in Terminal
  7. Input the following command into Terminal and press Enter.diskutil cs create Macintosh\ HD identifier1 identifier2Replace identifier1 with the identifier of the faster SSD and identifier2 with the identifier of the HDD.
    E.g., diskutil cs create Macintosh\ HD disk0 disk1 
    Create a new Core Storage Logical Volume Group
  8. Wait for the logical volume group to be created and write down its UUID. (e.g., DBFEB690-107B-6EA4-509B-2971D10F5B53) 
    The UUID of the New CoreStorage Logical Volume
  9. Type the following command after replacing UUID with the number of the new logical volume group.diskutil cs createVolume UUID jhfs+ Macintosh\ HD 100%Create a new logical volume of the Fusion Drive
  10. Once Terminal is done, quit it and go back to the macOS Utilities window.
  11. Click "Reinstall macOS" and follow the instructions on the screen to complete the installation.

Solution 2: Split the Fusion Drive and reset it again

If Disk Utility displays a CoreStorage Logical Volume Group or something similar that resembles the one labeled "Fusion Drive" but the sub-volume is missing and you can't select it during the OS reinstall, you can split the offending Fusion Drive and then recreate it. The issue often arises after failing to format the Fusion Drive.

 Warning: Make sure the data on the Fusion Drive is recovered before continuing.

  1. In macOS Recovery, open Utilities > Terminal.
  2. Run the command below and note down the UUID of the Logical Volume Group.diskutil cs listCheck the CoreStorage Logical Volume Group UUID in Terminal 
     
  3. Run the command below to delete the logical volume group, replacing lvgUUID with the strings of numbers and letters you gained in step 2.diskutil cs delete lvgUUID
  4. Then reset the Fusion Drive, as we mentioned previously.

Be reminded that these steps only apply to Macs running macOS 10.13 High Sierra and earlier. If your Mac is running macOS 10.14 Mojave or later, you can erase the Fusion Drive instead.

 Note: If your Fusion Drive still won't work, it's suggested that you take your Mac to the repair shop for a hardware examination.

Share this post to help others whose Fusion Drive is not showing up on Mac.

 

Why is your Fusion Drive not showing up on Mac?

If your Fusion Drive is not showing up on Mac, it likely results from one of the following causes:

  • Finder isn't set to display internal drives.
  • Disk Utility is set to display only volumes.
  • The Fusion Drive was split and no longer functions as a whole logical drive.
  • One of the drives (likely the HDD) is dead.

 

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