Second partition on Fusion drive

Discussion in 'Mac mini' started by Yoshimura, Aug 15, 2013.

  1. Yoshimura macrumors regular

    Joined:
    Nov 2, 2012
    #1
    If I create a second partition on a Mac mini with Fusion drive, will I get '2 Fusion drives' or 'one Fusion drive and a HHD drive'?

    Is this operation reversible? If so, how?
     
  2. opinio macrumors 65816

    Joined:
    Mar 23, 2013
    #2
    You can only partition he HDD part of the Fusion. So I am guessing you will need to partition the HDD first, then fuse the SSD to one of the partitions. The result is a fusion drive made up of the SSD and one HDD partition and a second partition on the HDD.

    I could be wrong but I think you will need to do that though the command line through disk util and CoreStorage. I am not sure if the disk util GUI allows you to build a fusion from a partition. It might want the whole HDD.

    It would be reversible. Although you would need to rebuild the fusion from scratch to fully utilise both drives again.
     
  3. KrisLord macrumors 6502a

    Joined:
    Sep 12, 2008
    Location:
    Northumberland, UK
    #3
    It's a while since I did it but think disc utility can add 1 partition to an existing fusion drive.

    As noted above this partition exists only on the mechanical drive.
     
  4. opinio macrumors 65816

    Joined:
    Mar 23, 2013
    #4
    After looking at my Fusion in Disk Utility in OS X you could be right. It looks like you can partition the HDD in a Fusion in the GUI even after the Fusion is built. I'm not willing to try it but it suggest I can and shows the size of the the drive I am partitioning as 1TB which is obviously my HDD. My Fusion is a 240GB SSD and HGST 7200 1TB.

    I would be interested to know (if anyone tries it) if the GUI works.
     

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