Can't partition disk

Discussion in 'macOS' started by Grayson, Sep 3, 2015.

  1. Grayson macrumors newbie

    Oct 8, 2007
    I am trying to create a bootcamp partition on a Mid 2012 Macbook Pro.
    However whenever I try to partition the disk I get an "Invalid partition" error.
    After some disk utility mucking around I have discovered that it is the partitioning process itself that corrupts the disk!

    From Disk Utility:
    1. I verify the disk - No errors
    2. I set a partition size, and click apply
    3. I get the "Partition Failed with the error: The disk needs to be repaired..."
    4. I go back and verify the disk, and hey presto I have a error "invalid directory item count"

    hmm, my wife is thinking she needs to buy a PC at this point, any suggestions to get past this error?

  2. keysofanxiety macrumors G3


    Nov 23, 2011
    That sounds unusual, best to verify it's not a hardware issue. Download SMART Utility here, anything other than 'Passed' means the HDD is corrupted and requires replacing.
  3. Fishrrman macrumors G5


    Feb 20, 2009
    Sounds like it's time to:
    1. Back up whatever data is on the drive
    2. RE-initialize the drive
    3. TEST the drive
    4. Copy your data back (assuming the testing reveals no problems).

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