Fusion Drive. A single drive?

Discussion in 'iMac' started by iHateMacs, Oct 4, 2014.

  1. iHateMacs macrumors 6502a

    iHateMacs

    Joined:
    Aug 13, 2008
    Location:
    Coventry, UK
    #1
    Is my 3TB fusion drive an all in one drive that contains a HDD and a SSD or is it only "one drive" because the iMac treats a 3TB HDD and a 128GB SSD as one drive but in reality they are separate devices?
     
  2. jqworle macrumors newbie

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    Jun 26, 2013
    Location:
    UK
  3. marzer macrumors 65816

    marzer

    Joined:
    Nov 14, 2009
    Location:
    Colorado
    #3
    The latter. A fusion drive is made up of two devices, a 128GB SSD and a 3TB HDD. The operating system (a subsystem known as corestorage) creates a single logical volume from the two physical devices.
     
  4. iHateMacs thread starter macrumors 6502a

    iHateMacs

    Joined:
    Aug 13, 2008
    Location:
    Coventry, UK
    #4
    Thank you.
     
  5. vga4life macrumors 6502

    Joined:
    Jun 16, 2004
    #5
    Yep, this - and I'd also note that it is possible to split the fusion drive into 2 separate volumes if you're so inclined.

    http://www.macworld.com/article/2015664/how-to-split-up-a-fusion-drive.html
     
  6. marzer macrumors 65816

    marzer

    Joined:
    Nov 14, 2009
    Location:
    Colorado
    #6
    Yup. That simply deletes the corestorage logical volume leaving the drives addressable as two separate physical devices.

    For some Fusion "fun" :D, follow the discussion in this thread. I've added multiple partitions (beyond the 2 permitted by the GUI version of Disk Utilty) or resized partitions in a Fusion configuration without losing the existing data.
     

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