Unfused my Fusion drive

Discussion in 'Mac mini' started by chrise2, Jan 13, 2013.

  1. chrise2 macrumors 6502

    Sep 17, 2012
    I got the new Mac mini with the Fusion drive option thinking I could live freely and let OS X manage where my stuff was. Turns out I was a bit too OCD for that. I found another thread that referenced this article:


    Here's what I did:

    - Booted into recovery mode
    - At a terminal prompt did a "diskutil cs list" to show the info on the Fusion logical drive
    - Ran a "diskutil cs deleteVolume <guid of Fusion volume>
    - Ran a "diskutil cs delete <guid of Fusion volume group>
    - That broke the Fusion and I was able to run the OS X installer and install the OS to the SSD. Note, that going into the gui diskutil results in a prompt to "fix" your drives. When I did that, it re-fused everything.
    - After OS X was installed, I created sym links for folders I wanted on the 1 TB 5400 drive. I used the commands in this article:


    Now I have full control over what goes where. Totally defeating the point of the Fusion drive. But now I don't have the "What the heck is the hard drive churning on when I'm not doing anything feeling?"

    I'm still restoring all of my data, but so far, things appear to be working just fine. Just figured I'd share my experience if anyone else wanted to do the same.
  2. dukee101 macrumors member


    Jan 17, 2009
    Just curious, did you undo Fusion because performance was lacking? Or simply because you couldn't track why the HDD was spinning when it was?

    I'm about to buy a new Mac Mini and I've been told by various people to "trust the Fusion Drive algorithms" and that they're very speedy, even when they're 50-60% full with data.

    But then again, I don't know. I haven't had enough real-world feedback on this issue. Maybe you can provide some.
  3. Exodist macrumors member


    Dec 5, 2012
    Buenavista, Agusan Del Norte, Philippines
    Some like the fusion drive setup. But like the OP I have OCD and a hard drive being to active to often drives me insane. I rather have performance and better control over my files myself.
  4. AC Rempt macrumors 6502

    AC Rempt

    Feb 24, 2008
    Weird. My hard drive is rarely active since I rolled my own Fusion drive. Are you guys working with larger files?
  5. TahoeBlue macrumors member

    Apr 4, 2012
    I very rarely have the hard drive spin up after the first week. And when it does, I barely hear it.

    My Time Capsule, on the other hand, is super loud.
  6. chrise2 thread starter macrumors 6502

    Sep 17, 2012
    I was hearing a lot of disk activity. When I work from home, I use an encrypted Windows VMware Fusion virtual machine. Its a single 50+ GB file. I'm wondering if Fusion was getting confused with that. Now that I have that forced on the SSD along with OS X and most of my settings, the only time I hear the HD spin up is when I access my photos, music or video (the content I put on the HD).

    To be honest, the performance was totally fine . So, Fusion was probably mostly doing its job. I just really needed to know that the VM was on the SSD.
  7. Mr. Retrofire macrumors 603

    Mr. Retrofire

    Mar 2, 2010
    Stop the drive indexing in the installed version of Windows (“C:” drive, probably via context menu -> Properties). See also:

    Or do you need this in your Windows VM? On the Mac side i disable spotlight on many drives/volumes, where i do not need spotlight (Time Machine volume, software/music/video archive, and so on).

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