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Please help!  New Mac Mini Fusion Drive Nightmare!

1985 Views 10 Replies Latest reply: Dec 29, 2012 8:20 AM by T\'Lai RSS
Swift1113 Level 1 Level 1 (0 points)
Currently Being Moderated
Nov 5, 2012 6:51 PM

Hi all,


I just received a new Mac Mini today that has the 1TB Fusion Drive installed.  After successfully migrating all of my files to it, I went to create another Mac partition on the Fusion Drive.  Towards the end of the partioning process, an error of 'invalid request' occurred and I am now left with a large chunk of the drive that is classified as 'Free Space'.  Oh well, no worries right?  Just format the free space, right? 




Disk Utility is not letting me do ANYTHING with 340GB of 'Free Space' anymore.  If I choose to format it to any format, click 'Apply', and then click 'Partition', Disk Utility flashes the words 'Preparing to partition disk...' and then just does NOTHING.  Everything is greyed out as well in terms of the 'Options...' button.  I have tried every possible option that Disk Utility offers with no luck at all. 


So basically I am just completely stuck and can't access that 340GB of Free Space anymore.  I tried to restart using Command-R and doing a repair disk that way but Disk Utility just says the partition map is fine and doesn't report any other errors during the repair or verify disk processes.  I'm not opposed to just blowing the entire Mac away and restoring it back to factory condition, but can I even do that?  Won't it just revert OS X back to its original state but leave the partitioning untouched?


Does anyone have any advice?  I have never seen Disk Utility error out during a partition operation and have certainly never seen behavior like that before.  I read somewhere that Macs with the Fusion Drive have a special version of Disk Utility and I'm wondering if this version just isn't stable? 


I'm totally stuck and would appreciate any help anyone might be able to offer.


Thank you!

Mac mini, OS X Mountain Lion (10.8.2)
  • den.thed Level 7 Level 7 (23,430 points)

    Startup from your Recovery Partition and then in two steps, see if you can 1) remove the second partition by selecting 1 partition, then 2) drag the partition divider down to add the space back to the first partition and click apply.

  • VikingOSX Level 5 Level 5 (4,815 points)

    A little light reading from Apple on the Fusion Drive. FYI.

  • den.thed Level 7 Level 7 (23,430 points)

    Awesome VikingOSX, I hadn't seen that and owe you a tall frothy one.


    iMac, Mac Mini, iPad, iPods, Mac OS X (10.6.8), (10.8.2), Safari, iTunes, iPhoto
  • BDAqua Level 10 Level 10 (114,830 points)

    Did you try highlighting the bottom space there?

  • VikingOSX Level 5 Level 5 (4,815 points)

    Cool. A happy ending.


    Good Luck.

  • T\'Lai Calculating status...
    Currently Being Moderated
    Dec 28, 2012 11:50 PM (in response to Swift1113)

    I had exactly that problem with my new iMac. Thank you so much for posting your fix! Is there any way you could go back and label this thread as solved so that anyone else with this problem will know you found a fix? Thanks!

  • T\'Lai Level 1 Level 1 (0 points)

    Interesting. I actually merged all partitions back into one single partition. I decided that I didn't want to repartition it until Apple comes out with some kind of firmware upgrade to fix the fusion drive issues, but as far as DU goes, everything looks like I could repartition it into two parts of any sizes I choose. It would mean redoing your windows side, but you should be able to do the same thing. I don't blame you if you don't want to do that though, in theory, it shouldn't be necessary.


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