Clone Fusion Drive

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

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  1. GP-SE, Feb 10, 2014

    GP-SE macrumors 6502

    Joined:
    Feb 27, 2013
    #1
    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?
     
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  2. satcomer, Feb 11, 2014

    satcomer macrumors 603

    satcomer

    Joined:
    Feb 19, 2008
    Location:
    The Finger Lakes Region
    #2
    What are you using to clone the drive?
     
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  3. ScoobyMcDoo, Feb 11, 2014

    ScoobyMcDoo macrumors 65816

    Joined:
    Nov 26, 2007
    Location:
    Austin, TX
    #3
    You might be able to use the dd command:

    Code:
    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.
     
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  4. Weaselboy, Feb 11, 2014

    Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #4
    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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