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.
This feature is the basis of Apple's new Fusion Drive technology; its presence in OS X 10.7 and later allows you to create custom Fusion Drive setups and implement them on Mac systems that did not. In one case a Macworld reader found that, following a Mac OS X update, the Fusion Drive became unlinked. Our colleagues at Macworld US recommended rebooting in.
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.
Before you begin
Remove Fusion Drive Mac
If you're not sure that your Mac was configured with a Fusion Drive, or that the drive has been split:
Mac Os X Delete Fusion Drive
- Disconnect any external storage devices from your Mac.
- 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
- 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.
- When you see the macOS Utilities window, choose Utilities > Terminal from the menu bar.
- Type
diskutil resetFusion
in the Terminal window, then press Return. - Type
Yes
(with a capital Y) when prompted, then press Return. - When Terminal indicates that the operation was successful, quit Terminal to return to the macOS Utilities window.
- Choose Reinstall macOS, then follow the onscreen instructions to reinstall the Mac operating system. Your Mac restarts from your Fusion Drive when done.
If you're using macOS High Sierra or earlier
- 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.
- When you see the macOS Utilities window, choose Utilities > Terminal from the menu bar.
- Type
diskutil list
in the Terminal window, then press Return. - 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.
- 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
- 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. - Type
diskutil cs list
, then press Return. - 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 - 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%
- When Terminal indicates that the operation was successful, quit Terminal to return to the macOS Utilities window.
- Choose Reinstall macOS, then follow the onscreen instructions to reinstall the Mac operating system. Your Mac restarts from your Fusion Drive when done.
It also depends on which version of the OS you're using to make the fusion drive AND the age of the Mac you're running.
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I don't know exactly if it is only in Mavericks of if Mountain Lion already supported this in the latest updates, but after creating a Fusion Drive the second hard drive actually contains a recovery partition.
For example, this is my FD:
*don't mind the disk size as there are windows partitions I removed from the listing
But what you want to pay attention to is the size of both 'Boot OS X' partitions. On the first disk, it is 134 Mb, on the second, it is 650 Mb.
Digging inside the second partition one will find the BaseSystem.dmg hidden from Finder, but visible through Terminal's ls command:
Trying this on an iMac 27' late 2009, the Recovery Partition does NOT show up when holding the Option key. It is good to mention that the iMac late 2009 was built BEFORE Fusion Drives, thus leading me to conclude that part of its BIOS / UEFI system simply doesn't know to look for that particular recovery partition aside the standard one mentioned on the article.
It DOES show up on newer macs that were built AFTER Fusion Drive was available.
I hope this helps a bit. =)