Removing Logical Partition

Discussion in 'OS X Yosemite (10.10)' started by jdrizzo3, Feb 6, 2015.

  1. jdrizzo3 macrumors newbie

    Feb 6, 2015
    Hello All,

    I have a partition on my HDD that contains a beta build of Yosemite that I would now like to remove. When I go to disk utility to remove that partition the gray '-' button is grayed out. Does anyone have any suggestions on how to remove this?

    Thanks in advanced for your assistance!
  2. BasicGreatGuy, Feb 6, 2015
    Last edited: Feb 6, 2015

    BasicGreatGuy Contributor


    Sep 21, 2012
    In the middle of several books.
    Try the following command in Terminal

    diskutil cs list

    and then

    diskutil coreStorage revert lvUUID

    where lvUUID is the last lvUUID reported by the previous Terminal command.

    You may have to restart your Mac for everything to get back to normal after you have run these commands in Terminal.
  3. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    Just run this command in Terminal substituting the "volume name" for the name of the volume where you installed Yosemite and that will nuke it. Be sure to include the quotes. Restart after.

    This won't harm the other volume you are running on, but backup first just in case you mistype or something and break everything. :eek:

    diskutil cs delete "volume name"

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