How to Resize a Disk Partition in Disk Utility?

Discussion in 'Mac Basics and Help' started by RayeChalar, Jul 26, 2012.

  1. RayeChalar macrumors newbie

    Jul 26, 2012
    I'm on a 15" MacBook Pro, running OS X Snow Leopard 10.6.8

    I recently downgraded to Snow Leopard from Lion, and instead of using an external hard drive to save a back-up of my files and applications, I simply made a new partition for Snow Leopard to be installed to in Disk Utility, and then transfered all my files to that partition after the installation progress.

    Once I was done, I deleted the old partition, leaving free space. But now, I can't seem to make the current disk I'm running off of any larger. There's no option to drag the box up into the "free space" area. I've also tried typing in the box labeled: "Size" and clicking "apply" to see if it would make it larger, but it didn't work. I'll include a screenshot of what I'm looking at. Thanks for the help!


    Attached Files:

  2. simsaladimbamba

    Nov 28, 2010
    You can only change the size via the end of one partition, not via the start of a partition, thus you have two choices (maybe three, if you are willing to pay more money for it).
    Make the unformatted space before the Snow Leopard partition into an extra partition to have a data partition or whatnot, or get hold of an external HDD, properly formatted (GUID as partition scheme, Mac OS Extended (Journaled) as format), use CarponCopyCloner (version 3.4.4 should suffice) to make a clone of the Snow Leopard partition onto the external HDD, boot from the external HDD via holding down the Option key after the startup sound, format the internal HDD completely via Disk Utility like you did with the external HDD, then use CarbonCopyCloner to clone the external HDD to the internal HDD and again boot from the internal HDD.
    Or you could buy some partition software like iPartition and others to reorganise the partition schematics.
  3. Fishrrman macrumors G5


    Feb 20, 2009
    I don't believe you need an external drive.

    Assuming that the first, now-empty partition is large enough, just use CarbonCopyCloner to clone the contents of the second (Snow Leopard) partition to the first (empty) partition.

    Once done, you will have -2- partition with Snow Leopard. (suggestion: give the first partition a distinctive name, so you will be able to distinguish between it and the other SL partition)

    Use Startup Disk to set the first partition as your boot p. Then reboot.

    Once rebooted, check to be sure the clone is "as you like it", then, delete the -old- Snow Leopard partition (the second one down).

    I can see this going one of two ways:
    1. It may be possible to simply delete the partition (and all the contents along with it), or…
    2. You may first need to delete the contents using the finder, then use Disk Utility to remove the partition

    When done, you should have one partition, with all of its contents toward the physical "beginning" of your drive.

    I've cloned one partition to another on the same drive before, no problems at all.

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