Clone Fusion Drive

Discussion in 'macOS' started by GP-SE, Feb 10, 2014.

  1. GP-SE macrumors 6502

    Feb 27, 2013
    Hey guys, how do I clone just the mechanical hard drive in my fusion drive setup:
    128GB SSD
    1TB Hard Drive

    I just want to clone the mechanical hard drive, so I can replace it with another one (same 1TB size, just different brand)

    I know on Windows I can do a block level copy of the hard drive using acronis software, but does the same thing exist on the mac?
  2. satcomer macrumors 603


    Feb 19, 2008
    The Finger Lakes Region
  3. ScoobyMcDoo macrumors 65816

    Nov 26, 2007
    Austin, TX
    You might be able to use the dd command:

    dd bs=500m if=/dev/rdiskx of-/dev/rdisky
    Where x and x are numbers indicating the correct disk device. You will have to figure out what these are. The bs (block size) argument I put in the example may not be optimal. Usually the larger you use, the faster it will run as long as you don't make the buffer so big that it gets paged out.

    Use the man command to get full documentation on the dd command.
  4. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    I don't believe any utility is going to be able to do what you want since a Fusion drive is seen by the system as one, large drive. You are going to need to copy everything off the Fusion drive then replace the HDD and recreate the Fusion drive and copy your data back to the Fusion.

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