massive problems partitioning Mac book please help!!!!!

Discussion in 'macOS Sierra (10.12)' started by Nick farrow, Jan 1, 2017.

  1. Nick farrow macrumors newbie

    Jan 1, 2017
    I've a MacBook running Sierra but using a external hard drive as the MacBook locked up on me and I managed to press ctrl r and get her running but only thru a back up the second I unplug the external drive the Mac fails ,I was told to go to disk utility and wipe the main 500gb drive and partition it but I'm getting a error saying SYSTEM FORMATTED FAILED can someone pleas help as its driving me mad also if I can be repaired how to I put the operating system from the external drive back on to the internal Mac book drive
    many thanks
  2. Fishrrman macrumors P6


    Feb 20, 2009
    You are booting and running the MacBook using an external drive, is this correct?

    If so, you could do this:

    1. Boot from the external drive
    2. When you get to the finder, open Disk Utility
    3. Choose to "Erase" the internal drive (same as "re-initialize").
    4. Choose HFS+ with journaling enabled. Give it a meaningful name.
    5. Let DU re-initialize the internal drive.
    When done, the drive should mount on the desktop, but there will nothing on it.

    To copy over the OS:
    Fastest, easiest, cheapest way:
    (This assumes that everything on the external drive will fit on the MacBook drive):

    1. Download CarbonCopyCloner from:
    CCC is FREE to download, and it's FREE to use for 30 days.
    2. Launch CCC.
    3. Check CCC's prefs so that it is set to copy the recovery partition as well.
    4. Put your SOURCE DRIVE (external drive) in the leftmost window.
    5. Put your TARGET DRIVE (internal drive) to the right of it.
    6. There is a popup regarding handling of data -- set this to "delete anything that doesn't exist on the source"
    7. Now click the "Clone" button and let CCC do its thing.

    When done, CCC will "clone" the external to the internal -- exact copy.

    Now, power down, all the way off.
    Disconnect the external drive and press the power-on button, THEN...
    ... immediately hold down the option key until the startup manager appears.
    Select your internal drive with the pointer and hit return.
    Do you get a "good boot"?

    Let us know.
  3. bjet767 macrumors 6502a

    Oct 2, 2010
    Sounds like your internal drive has failed.

    Is it an SSD or old fashion HD?

    What year and model MacBook?

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