Disc Utility Partitioning Question

Discussion in 'Mac Apps and Mac App Store' started by Hrothgar, Nov 21, 2013.

  1. Hrothgar macrumors 6502

    Joined:
    Mar 11, 2009
    Location:
    New York
    #1
    I'm having trouble modifying a partition on my external drive.

    I have a 1Tb WD external drive. I had put a back up of my internal drive onto the External. Then, I partitioned the External. I'm not sure I did it the best way. I think I first shrunk the original partition down to 750 gb, then added the second partition. I would like to re-size the partitions again, but it wont let me resize the second partition. It says that the partition can't be modified, and when I click info, it says "Owners Enabled: No."

    Any idea how to fix this?
     
  2. Hrothgar thread starter macrumors 6502

    Joined:
    Mar 11, 2009
    Location:
    New York
  3. blueshirt31 macrumors newbie

    Joined:
    May 21, 2012
    #3
    First you need to shrink Backup partition to create empty space and then you should be able to extend the Media partition to allocate the available free space.
     
  4. Hrothgar thread starter macrumors 6502

    Joined:
    Mar 11, 2009
    Location:
    New York
    #4
    Got it. i thought i could do the whole thing in one shot.
     
  5. Hrothgar thread starter macrumors 6502

    Joined:
    Mar 11, 2009
    Location:
    New York
    #5
    Well, that didn't work. I shrunk the first partition, but the second still says that it can't be modified:

    [​IMG]
     
  6. old-wiz macrumors G3

    Joined:
    Mar 26, 2008
    Location:
    West Suburban Boston Ma
    #6
    I suspect you will have to copy the data to another external, reformat the current, and re-copy.

    Pretty sure you can expand a partiton backwards..ie expand "media" into space formerly used by "backup"
     
  7. blueshirt31 macrumors newbie

    Joined:
    May 21, 2012
    #7
    It appears old-wiz is right. According to this: http://pondini.org/OSX/DU4.html

    You can expand a partition, but only by moving the "bottom" of it down in the diagram, into empty space. You cannot move the "top" of a partition.

    I thought you could expand Media partition once you shrink the Backup partition. One option is to do what old-wiz suggested, copy the data from your disk and then copy it back. I assume you do not have to delete both partitions. Just Media partition, shrink Backup to the size you wish and then create new Media partition and copy back data. Other solution is to use third-party tool such as iPartition to do what you need. I am not much familiar with (free) tools for Mac. In any case, before doing anything make sure to make a backup of your drive first.

    Good luck!
     
  8. Fishrrman macrumors G4

    Joined:
    Feb 20, 2009
    #8
    Suggestion:

    1. Copy the contents of the second (lower) partition to another drive

    2. Re-initialize the drive, and set up with partition sizes desired.

    3. Re-create your backup on the first (upper) partition (CarbonCopyCloner would be a good choice). Aside: you should make the partition size for the backup large enough to accomodate "future growth".

    4. Re-copy the contents of the lower partition.

    This will work if nothing else does.
     

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