Cant delete partition

Discussion in 'OS X Yosemite (10.10)' started by Nat8212, Jul 26, 2014.

  1. Nat8212 macrumors newbie

    Joined:
    Jul 26, 2014
    #1
    I installed Yosemite on a partition to test and then I decided to run it as my primary driver. However now that I have upgraded to Yosemite, I can't delete the partition.

    When I go to disk utility, I can't click the "-" to remove the partition. That option is just blocked out.
     
  2. tywebb13, Jul 27, 2014
    Last edited: Jul 27, 2014

    tywebb13 macrumors 68020

    Joined:
    Apr 21, 2012
    #2
    It sounds like your yosemite installer may have created core storage logical volume groups which is preventing you from changing your partitions. You can run this in terminal to get your partitions back to normal. You will then be able to change them again after this.

    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. Nat8212 thread starter macrumors newbie

    Joined:
    Jul 26, 2014
    #3
    Does it matter which partition I am putting these commands in?
    and can you clarify the last part (lvUUID)

    Thanks
     
  4. tywebb13, Jul 27, 2014
    Last edited: Jul 27, 2014

    tywebb13 macrumors 68020

    Joined:
    Apr 21, 2012
    #4
    It won't matter which partition you run them from.

    The lvUUIDs are logical volume universally unique identifiers. If core storage logical volumes were indeed created, you may get several of these when you run the command

    diskutil cs list

    in terminal. Just copy and paste the last one of these into the next command replacing the red bit with your lvUUID.

    diskutil coreStorage revert lvUUID
     
  5. Nat8212 thread starter macrumors newbie

    Joined:
    Jul 26, 2014
    #5
    what you mentioned didn't really work. I can now delete a partition however the only partition I can delete my main one. In disk utility the partition i want to delete is the logical volume group, while the partition I want to keep is mac os extended.

    is there a way I can swap that around?
     
  6. tywebb13 macrumors 68020

    Joined:
    Apr 21, 2012
    #6
    The purpose of these commands is to get rid of the logical volumes altogether and revert them back to normal partitions. You will then be able to change them again. There are more detailed explanations in this thread: http://forums.macrumors.com/showthread.php?t=1741742
     
  7. Nat8212 thread starter macrumors newbie

    Joined:
    Jul 26, 2014
    #7
    Thanks! All I had to do was erase the yosemite partition then I could get rid of it!
    All good, thanks for your help!:)
     
  8. lenard macrumors 6502

    Joined:
    Oct 10, 2007
    Location:
    Raleigh NC
    #8
    You have to erase it first and then you can delete it, the space will be combined
    with the disk as a whole. That worked for me.
     
  9. Nat8212 thread starter macrumors newbie

    Joined:
    Jul 26, 2014
    #9
    yep worked for me to except now my drive name has reverted to "APPLE SSD SM0512F MEDIA"

    is there a way to change that? (not a big problem but its bugging me a little haha)
     
  10. lenard macrumors 6502

    Joined:
    Oct 10, 2007
    Location:
    Raleigh NC
    #10
    you can always change the name of a HD, but I know why yours changed, my HD name did not change.
     
  11. Fishrrman macrumors G4

    Joined:
    Feb 20, 2009
    #11
    re
    [[ yep worked for me to except now my drive name has reverted to "APPLE SSD SM0512F MEDIA" ]]

    Can't you just click on the drive's name in the finder and re-name it??
     
  12. Nat8212 thread starter macrumors newbie

    Joined:
    Jul 26, 2014
    #12
    Don't worry. It's not my hard drive name, I can change that. Its the ssd name. But maybe its meant to be called that and I didn't check before upgrading
     
  13. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #13
    Yep. The developer previews seemed to only make this core storage volume if Yosemite was installed on a second partition. Now since the public beta I have seen several posts here reporting it converts to core storage even with a clean install to one partition on a freshly erased disk.

    I am wondering if Apple did this for some reason? Maybe they think a core storage volume like this would be less susceptible to disk corruption.

    That is the drive brand name and normal, you just did not notice it before. :)
     
  14. forza69, Jul 27, 2014
    Last edited: Jul 27, 2014

    forza69 macrumors 6502a

    forza69

    Joined:
    Jan 30, 2010
    Location:
    San Diego, CA
    #14
    So Im trying to delete the Yosemite partition but the (-) button is not working. I just want my computer back to how it was :/

    edit -

    So just to be sure, and Im reading it correctly from the thread tywebb13 posted, I have to delete the Yosemite HD (pic 2) and then Ill be able to delete the partition from pic 1?
    Im assuming after doing so, everything will go back to how it was..
     

    Attached Files:

  15. Bruno09 macrumors 68020

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    Aug 24, 2013
    Location:
    Far from here
    #15
    You must select the partition you want to delete to make the "-" button work.

    This is just in case (in your screenshot the Yosemite partition is not selected).

    This will not solve your problem, this is just for info.
     
  16. Weaselboy Moderator

    Weaselboy

    Staff Member

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    Jan 23, 2005
    Location:
    California
    #16
    You can't delete it from there because Yosemite turned the volume into a core storage volume. Follow this to delete it and everything will go back like it was.
     
  17. forza69 macrumors 6502a

    forza69

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    Jan 30, 2010
    Location:
    San Diego, CA
    #17
    Ok, so is this correct?
    Afterward just drag my Macintosh partition down to expand into the empty space?
     

    Attached Files:

  18. Weaselboy Moderator

    Weaselboy

    Staff Member

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    California
    #18
    You got it exactly.
     
  19. forza69 macrumors 6502a

    forza69

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    Jan 30, 2010
    Location:
    San Diego, CA
    #19
    Thank you :D everything is back to normal now.
     
  20. chrisrand macrumors member

    Joined:
    Aug 17, 2013
    #20

    I know this is an old article, but this recently happened to me and the easiest way to get rid of the Yosemite partition is to:

    1) Boot your other OS, mine was Mavericks
    2) Open Disk Utility
    3) Select the Yosemite partition
    4) Select the erase tab, erase it,
    5) Select the main drive and go to the partition tab, where you can then delete the Yosemite partition and resize it back to the original size.

    Hope that helps!
     

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