Resolved Disk Utility won't let me create a new partition

Discussion in 'Mac Basics and Help' started by Patrick946, Mar 6, 2011.

  1. Patrick946, Mar 6, 2011
    Last edited: Mar 14, 2011

    Patrick946 macrumors regular

    Jun 21, 2009
    I want to split a partition on my external hard drive into two parts. Right now there are two partitions: one for Time Machine and one for storage. I want to end up with three partitions.

    In disk utility, I select the hard drive on the left side, choose the partition tab, and then select the partition labeled "Storage." Based on what I've read, I should be able to click on the + button underneath that window, but it is greyed out for me. Am I missing a step?
  2. old-wiz macrumors G3

    Mar 26, 2008
    West Suburban Boston Ma
    In order to do it via Disk Utility you have to erase the parition first, then delete it, then split it. IIRC there might be 3rd party utilities that will do it on the fly, but I'm not sure.

    The easiest thing to do is copy the data from storage to elsewhere, erase it, then delete and create new.
  3. Mal macrumors 603


    Jan 6, 2002
    Actually, Disk Utility is perfectly capable. There's another problem here most likely.

  4. Damo01 macrumors regular

    Feb 11, 2010
    Assuming you're using an external HD for TM and storage with two partitions formatted as HFS+, right?

    If you have any free space on that particular partition of that HD you selected, that + option button should be available and not grey out. Although the "greyed out" could mean a numerous of things other than just "free space".

    It could mean that you don't have any free space or the Partition you selected isn't of one apple's formats but formatted as windows NTFS or something else.
  5. Patrick946 thread starter macrumors regular

    Jun 21, 2009
    I'm assuming it's HFS+ since I formatted it and created the current partitions with my macbook. I'm not sure what you mean by free space. Do you mean space that isn't part of either partition, or space within the partitions? The one that I'm trying to split in two is about 1/3 full, so there should be enough free space there. I'll take a screenshot after work today and post it here, maybe that will help clear things up.
  6. Patrick946 thread starter macrumors regular

    Jun 21, 2009
    It took longer than I had planned, but here's a screenshot of what's going on when I try to partition.

  7. Patrick946 thread starter macrumors regular

    Jun 21, 2009
    I don't want to be a pest about this, but can anyone help? Do I need to delete the partition in order to split it?
  8. Morod macrumors 68000


    Jan 1, 2008
    On The Nickel, over there....
    The + button is grayed out as you said, but the Volume Scheme menu looks active. That is where you want to begin. What are your other options there besides Current?
  9. Patrick946 thread starter macrumors regular

    Jun 21, 2009
    The reason that I wasn't able to split the partition is because I had originally formatted in Master Boot instead of GUID. I ended up re-formatting the drive to have 3 new partitions in GUID instead of Master Boot. I had to copy everything to another drive and then re-backup time machine and move everything back into the storage partition.

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