Second partition on Fusion drive

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

  1. Yoshimura macrumors regular

    Nov 2, 2012
    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

    Mar 23, 2013
    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 65816

    Sep 12, 2008
    Northumberland, UK
    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

    Mar 23, 2013
    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.

Share This Page