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Disabling Fusion Drive and Installing Windows on SSD of Late 2012 iMac

9486 Views 26 Replies Latest reply: Aug 12, 2013 4:04 AM by Contradel RSS
  • Kagato101 Calculating status...

    Hi _z_


    I am currently working through this similar issue albeit not with the 3TB Fusion Drive. It is possible to rip apart the "Fusion Drive" that Apple configures the iMac with. If you look into Core Storage, which is parameter of the diskutil command in Terminal, it allows you to delete the Logical Group, which is what the Fusion Drive is configured as (SSD & HD joined into one Volume). After the Logical Group is seperated, from Terminal you can partition each drive on its own, and perform an Internet Recovery Reinstall on the SSD. Once 10.8 is reinstalled on the SSD, you can perform the Bootcamp partition and segment the SSD into two partitions, one for 10.8 and one for Windows. While this wouldn't give you all 3TB for the Windows OS, it would allow you to have Windows boot of the SSD and keep your data on the HD.


    As this is not documented very well, or in alot of places, I hope this helps you with your decision. While it isn't the cleanest, or maybe even the best solution, it does provide that capability.

  • Allan Eckert Level 8 Level 8 (39,335 points)

    You really should start your own thread for your problem.



  • cmenchini Calculating status...

    I am interested in the very same thing ... running Windows (7) off of the SSD from a decoupled 3TB fusion drive and using the platter drive for general storage.  I am currently running Windows 7 Pro through bootcamp with Mac OS X 10.8.3.  Interestingly, when I went through the bootcamp windows install it listed both the SSD and the platter drive with each of its partitions to install Windows on.  They also show up in the partitioning wizard inside of Windows 7 once it's installed.  I was tempted to click on the SSD partitions during Win set-up and install there, but I was afraid everything would go to **** in a handbasket if if I didn't use the partition I defined in Bootcamp while in OS X (Max 2135 GB - The balance left to Mac OS X).


    Anyhow, I'm also interested if anybody does have a reliable method to get Windows on the SSD.  As of today, Apple phone support didn't have any real answers for me. 

  • Loxodon Calculating status...

    Yesterday I took the plunge.


    I couldn't find a tutorial how to do it, but gathered enough pieces to risk it.

    I wanted to get rid of OSX i tried it i gave it a few months and i don't like it at all. (but thats another discussion).


    I wanted to install windows on the SSD for the extra performance.


    And I got it working. Its was quite easy:

    • Create bootcamp stuff and USB bootdevice and split the HDD into 2 pieces:

              one piece for windows harddrive

              one piece to install osx on (small if you dont want to use it)

    • GO into terminal with recovery mode and delete the fusion volume
    • Reinstall osx on the "small" partition you created from internet recovery
    • Run bootcamp wizard in osx after it installed (you dont have to recreate the usb drive just tel osx you want to install windows on bootcamp so he boots from the usb into windows setup)
    • In windows setup format the SSD and install windows onto it
    • Finish windows

    And there you go iMac with booting windows from the SSD.

    I did it with late 2012 27" iMac and windows 8 pro


    Hope this helps a few people out.


    Greetz Lox

  • Contradel Level 1 Level 1 (10 points)

    Hi Loxodon I'm glad it worked out for you!

    I was in the same dilemma until I saw your latest comment now I found hope. However I do have a few questions to the process:


    1. You said you started out by splitting the HDD, which one is that? The "Fusion Drive"? Or the Bootcamp drive the OSX Bootcamp assistant creates? How did you split it up?


    2. When in recovery mode you ran terminal and deleted the Fusion of the drives, why didn't that delete the partitions you made in step 1? Where I'm going is would any SSD partitioning not be impossible?


    3. Do you see a solution where you could have OSX running til a ~32GB SSD partition, and rest of the 128GB = 96GB SSD is for Windows. And then the 3GB HDD space would be NTFS formatted (but with NTFS drivers OSX would also be able to talk with these).

  • Loxodon Level 1 Level 1 (0 points)

    Hi Contradel,


    1. I splitted the fusion drive into 1 fusion drive with OSX on (which i will remove) and another harddrive. (maybe this step is not necessary. But i created it just to be sure

    2. It's been a while I think it does delete the drives I made before. But when reinstalling Oxs with internet recovery you can split them again however you want.

    3. Only thing i wouldn't do it is because it would become too small for me in windows.


    Hope i helped you out.


    Greetz Lox

  • Contradel Level 1 Level 1 (10 points)

    Thanks for your answer. Very helping.

    One more thing.


    Do you have any trouble with the microphone line in while running Windows?

    I heard the line in should have some trouble even if you have a three stage jack with audio/microphone.

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