Error trying to partition external drive

Discussion in 'macOS' started by Falcon9, Aug 17, 2015.

  1. Falcon9 macrumors regular


    Jun 17, 2015
    Eastern Canada
    I have an external 500GB HD that I use as a Time Machine backup for my rMBP. I had partitioned it into 2 a while ago; intending to store large files on the second partition but have now changed my mind. I deleted the second partition and am now trying to re-size the Time Machine partition to the full size of the drive. It works at it for a while and then gives me this error:
    Screen Shot 2015-08-17 at 4.33.43 PM.png
    What can I do to resolve this? Thanks!
  2. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    Try gong back to the First Aid tab and doing a repair disk.

    If that does not work, I think the problem is you are using the wrong partitioning scheme there. Normally you would want the OS X default GUID partition table. To fix that you will need to reformat the entire drive.

    Screen Shot 2015-08-18 at 9.45.40 AM.png

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