Wont let me delete Yosemite Partition!

Discussion in 'OS X Yosemite (10.10)' started by pk314, Sep 19, 2014.

  1. pk314 macrumors member

    May 18, 2014
    Hi, so I got access to the Yosemite public beta and installed it on a separate partition just to check it out and now i don't really feel a need for it and will download it once its released in October for everyone. When I went to disk utility to delete the Yosemite partition, it shows up all grayed out. How can I delete that partition so I get the space back?

    Attached Files:

  2. tywebb13 macrumors 68020

    Apr 21, 2012
    It looks that way because core storage logical volumes were created by the yosemite installer.

    The thing that resolves it is to do the following:

    Run this in terminal to get your partitions back to normal. This will also make a recovery partition visible when you boot up when holding the option key down.

    diskutil cs list

    and then

    diskutil coreStorage revert lvUUID

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

    Then restart for everything to get back to normal.

    Then you can delete it in the usual way.
  3. satcomer macrumors 603


    Feb 19, 2008
    The Finger Lakes Region
    This is not Windows! Boot from your Recovery Partition and use Disk Utiliy there to repartition the drive. In OS X you should always do erasing/partitioning from external the disk, not from the disk itself.

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