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  1. #1


    Member Since
    Aug 23, 2008
    Posts
    1
    Question creating a new volume undestructively? (with Disk Utility)
    Hello everyone,

    I have an external 250 GB HDD which has a 120Gb Mac OS Extended Journaled partition, the rest being free space. I'd like to create a second volume out of the free space which exists, using the Disk Utility. What I'd like to know is whether this would erase the data I already have on the existing partition (the first volume) or will leave the existing partition unaffected?
    I know in Windows this wouldn't affect the existing partition, but with Disk Utility I'm a little worried, as after I choose the partition type and name for the partition to be created and I click on the "Partition" button, a warning dialogue opens saying:

    "Partitioning a disk will destroy all the information on volume of the disk

    The disk has 1 volume
    "Name_of_my_existing_volume"

    Are you sure you wish to partition the disk?"

    Thank you in advance,
    Cheers,
    Horea

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    50,175
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, Sierra
    As long as you ONLY create and format the partition that's shown as free space you are in no danger of overwriting your OS X partition. Disk Utility more or less does the same thing as the Disk Administrator does in Windows XP.

    However, in order to stay one step ahead of Mr. Murphy, make a verified backup of your entire hard drive before proceeding.

    Regards.

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