iMac FusionDrive Partioning

Discussion in 'iMac' started by milomak, Apr 2, 2016.

  1. milomak macrumors member

    Joined:
    Apr 25, 2010
    #1
    I am contemplating getting the 27" iMac with 2TB FusionDrive.

    I however want to install Linux and Windows 10 on it as well. Will I be able to partition to install these OS as well?

    Let's not go into the merits of why I want to do this.
     
  2. hfg macrumors 68040

    hfg

    Joined:
    Dec 1, 2006
    Location:
    Cedar Rapids, IA. USA
    #2
    I think Apple only allows a single additional partition on a Fusion drive using the OS X tools. This partition is not part of the Fusion control and exists only on the hard drive.

    You can "un-Fuse" the Fusion drive and partition either drive as you wish, then recreate the Fusion drive using DIY instructions using the partitions you select. Unfortunately, the Apple Fusion SSD portion is too small to do much with partitioning it, however DIY installations using larger SSD drives can overcome this limitation.

    You can, of course, add additional Thunderbolt or USB 3.0 SSD or hard drives externally to do what you need. Small bus-powered portable drives can be easily hidden velcro mounted on the back of the iMac stand.
     
  3. dimme macrumors 65816

    Joined:
    Feb 14, 2007
    Location:
    SF, CA
    #3
    I have a late 2015 5K iMac with the 2 tb fusion drive. I have installed windows 10. I will only use the HDD drive of the fusion drive for windows. The HDD is a 7200 rpm drive and the I/O is pretty snappy in windows , it's not SSD speeds but great for a HDD. Linux may be another story, bootcamp on the 5K machines is pretty fussy compared to other models. But It has always been a chore to triple boot macs. If you can get away with using OS X and getting ventilation software I will be much easer.
     
  4. varian55zx macrumors 6502a

    varian55zx

    Joined:
    May 10, 2012
    Location:
    San Francisco
    #4
    I was amazed with the speed of my fusion drive today.

    iMac must've booted up in 5 seconds. Turned away for a second and everything was up. Everything opens immediately because the read speeds are very high.

    For anything on the HDD you already know it's there, and guess where the only slowdown in my computer comes from, a disgusting, lame, frequently disconnecting external hard drive that has to spin back up every now and then.

    I think it's safe to say I made the right choice.

    As for Windows, don't know. Hate it. Couldn't pay me to use Windows, but from what I hear you can't install it on the SSD portion of the fusion. Go figure
     
  5. milomak thread starter macrumors member

    Joined:
    Apr 25, 2010
    #5
    how do you un-fuse?
     
  6. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #6
    Here you go. It will erase everything though, so make sure you are backed up.
     
  7. RipeRetina macrumors regular

    RipeRetina

    Joined:
    Mar 26, 2009
    Location:
    Maryland
    #7
    This thread has answered alot of questions I had about installing windows 10 boot camp.

    I recently bought imac 5k 2tb fusion drive.

    Planning on using Windows for gaming purposes only. Anyone here have experience with this? How is performance?
     
  8. Fried Chicken macrumors 6502

    Fried Chicken

    Joined:
    Jun 11, 2011
    #8
    You will only be able to install BOOT CAMP on the HDD.
    You will get HDD performance.
     
  9. dimme macrumors 65816

    Joined:
    Feb 14, 2007
    Location:
    SF, CA
    #9
    I an not a big gamer but I do enjoy playing with MS Flight Simulator. I used to run it on a 2008 MacPro and now I moved to a late 2015 5K iMac with a 2tb fusion drive. The performance is great except for the video. I don't think the drivers for windows have caught up with being optimized for 5K, but I have set the resolution lower and for my needs I am happy.
     
  10. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #10
    Keep in mind, the 2TB Fusion drive only has 128GB Flash storage, so that I think is too small to hold 3 operating systems (OSX, Windows, Linux). I think its a bit tight to even hold 2, I was thinking of doing this, but felt 64GB for Windows in the long run will be too small.
     
  11. milomak thread starter macrumors member

    Joined:
    Apr 25, 2010
    #11
    i am undecided whether to:
    i) have the ssd fully for osx, or
    ii) a 40GB linux install and the rest osx

    the non-ssd will be partitioned 1GB ntfs and the balance linux partition/hfs+

    i think i will go with i) in the end
     
  12. milomak thread starter macrumors member

    Joined:
    Apr 25, 2010
    #12
    i don't know if i am being thick, but nothing there seems to talk to removing a fusion drive
     
  13. DeltaMac macrumors 604

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #13
    Yes - that article talks about deleting the core storage volume.
    "Delete Core-storage volume" = "Remove fusion drive"
    The fusion drive is a single core-storage volume, made up of the two devices - SSD, and HDD.
    If you delete the core storage volume (removing the fusion drive), then the SSD and the HDD can be used independently.
     
  14. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #14
    Here's a different set of instructions, technically its the same, just worded differently.

    MacWorld Split up a Fusion Drive
     

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