Repartitioning after installing Yosemite on a second part ion

Discussion in 'OS X Yosemite (10.10)' started by Dorv, Jul 4, 2014.

  1. Dorv macrumors regular

    Feb 11, 2008
    So, I installed the DP1 on a second partition of my rMBP's 256G SSD. Upgraded to DP2 when it was available.

    I'm headed out to SDCC in a couple of weeks, and was planning on repartitioning the drive so I would have enough room to do the iMovie work required of the video I'll take while there.

    I went into Disk Utility under my Mavericks install, but the ability to change the partition scheme or delete any of the partition is greyed out. Same with the Disk Utility available in the recovery partition.

    Anyone see what I'm missing something obvious??
  2. tywebb13 macrumors 68020

    Apr 21, 2012
    The yosemite installer probably made logical volume groups.

    If the yosemite installer creates logical volume groups, you can 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.

    You may have to restart for everything to get back to normal after you have run these commands in Terminal.
  3. Sparky2012 macrumors 6502


    Jul 16, 2012
    United Kingdom
    Stupid question I know (waiting until the public beta of Yosemite anyway) but would you type this terminal command into Mavericks (or current OS) or Yosemite?
  4. tywebb13, Jul 5, 2014
    Last edited: Jul 5, 2014

    tywebb13 macrumors 68020

    Apr 21, 2012
    It doesn't matter.

    I did it twice, once on an mba which only has yosemite on it, and on another computer (a mbp) which is dual booting mountain lion and yosemite and ran the commands whilst booted up in mountain lion.

    In both cases it fixed it.

    It should also work on a computer dual booting mavericks and yosemite and again it won't matter which you are booted up in.

    Anyway, one would hope it is fixed by the time the public beta is made available and so by then it shouldn't be an issue.
  5. Dorv thread starter macrumors regular

    Feb 11, 2008
    This did it. Thanks so much!!

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