Problem with Fusion drive

Discussion in 'iMac' started by Merthyrboy, Oct 26, 2015.

  1. Merthyrboy macrumors 6502

    Jul 21, 2008

    Just recently purchased the new iMac and tried to install Windows. There was a problem on the Windows side and the installation crashed leaving a partition that could no longer be removed. Used apple support to try and remove it and they said the best thing to do was to recreate the fusion drive. A strange thing seems to have happened though where I now have two Macintosh HD. Is there anyway to remove the other one as this doesn't look like a thing that should be happening.


    Screen Shot 2015-10-26 at 21.28.42.png
  2. Richie2000 macrumors 6502


    Jul 10, 2010
    West Sussex UK
    It could just be that Spotlight is indexing the volume incorrectly. Might be worth trying the following as first step?
  3. AntnyMikal macrumors regular


    Jun 2, 2012
    I'm curious what version of Windows? I actually need to install Windows on my new 5k as well as I need it for school stuff.

    I've read some were having problems installing Windows10. Not sure if it was bootcamp, El Capitan or the new iMac actual causing the issues.
  4. Merthyrboy thread starter macrumors 6502

    Jul 21, 2008
    I'll wait a few hours until spotlight has done it's thing and then have a look again. I was trying to install Windows 10, whoever was to blame it has not been good for me. Currently setting up parallels until I can sort out the problem.
  5. b18221964 macrumors member


    Jan 23, 2013
    I have the same problem on the latest iMac 27" Late 2015. Because of this problem, I accidentally separated my Fusion Drive into two drive; a SSD and a HDD. But I fixed it, Apple Online Support was useless.

    Bootcamp Windows 10 was fine on my MacBook and my 2012 iMac. This is the first time it failed and created a partition problem. Could this be because of the new installation procedures which requires the ISO now instead of creating an old fashion USB installation stick?

    Anyone else successfully install Windows 10 on the latest iMac?
  6. AntnyMikal, Oct 29, 2015
    Last edited: Oct 29, 2015

    AntnyMikal macrumors regular


    Jun 2, 2012
    I installed Windows 10 on my new 5k yesterday, bootcamp with the new procedures. No usb, just downloaded iso and moved it to desktop, then selected that as the location, partition etc then BC did its thing. Had no problems at all. Windows and El Capitan both run like Melting butter.

    Make sure your bootcamp version is 6 (519), and the OS is latest version. I also made sure there was nothing not needed running, no external drives connected etc.

    Funny thing is I spent all day trying to get Windows 7 or 8.1 or 10 on my wife's 2011 MBP with no success. Won't recognize iso or boot in alternate mode or give option to create iso, something to do with having a dvd drive...... Anyway got fed up and did the iMac since she needed to do work stuff, and it literally took an hour or so maybe even quicker.
  7. Merthyrboy thread starter macrumors 6502

    Jul 21, 2008
    I think this may be why I'm seeing two Macintosh HD's
    /dev/disk2 (internal, virtual):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:                  Apple_HFS Macintosh HD           +3.1 TB     disk2
                                     Logical Volume on disk1s2, disk0s2, ...
    Whenever I try to use bootcamp it now just gives me an error of "The startup fisk cannot be partitioned or restored to a single partition"
  8. b18221964 macrumors member


    Jan 23, 2013
    is your 5K the Late 2015? I never have a problem installing Windows on the last six Mac Computer I owned.
  9. AntnyMikal macrumors regular


    Jun 2, 2012
    Yes I have the late 2015 5k iMac. I've only ever had a problem bootcamping my wife's 2011 MBP ( which I'm still a little peeved about).

    For the late 2015 5k here was my process: **made sure El Capitan was latest version and BC was latest version then restart**
    1. Download authentic Windows 10 (EDU version from my online school store)
    2. Unzip ( basically double clicked the file and it unpacked and verified)
    3. Open that folder and make sure the iso was there and all the other usuals exe. drivers etc.
    4. Move the iso or that folder from downloads to desktop or documents ( not sure why, but I read somewhere that people were having problems with the install if the file was left in downloads)
    5. Open BC and follow instructions/ choose the destination you moved the file to ( made sure all apps that weren't part of this process were closed, and had no external devices connected except my second monitor)

    That was it, no need to make a bootable drive with the new BC, after all was done got the normal partition options, reboot etc.
  10. Merthyrboy thread starter macrumors 6502

    Jul 21, 2008
    I managed to get it working on an external hard drive which is good enough for what I need it for. Not using it for gaming or anything like that. I will have to fix it in the future but for the time being it works and I can do work :)

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