Can't delete empty partition

Discussion in 'Mac Basics and Help' started by DigiScoop, Sep 10, 2015.

  1. DigiScoop macrumors newbie

    Sep 10, 2015
    I had El Capitain on my computer in a separate partition. I rebooted my computer to recovery mode and erased the volume with disk utility. Immediately after the partition status changed to empty. and it was grey shown as greyed and I could not delete it or resize it.

    I have 1tb SSD "APPLE SSD SM1024F"

    Currently my "diskutil cs list" looks like this:

    +-- Logical Volume Group 4869FEF7-1F62-4DF4-BE7E-722E71F4FB89


    Name: Macintosh HD

    Status: Online

    Size: 803550294016 B (803.6 GB)

    Free Space: 5499891712 B (5.5 GB)


    +-< Physical Volume FAC26F4E-3D23-44AF-BD8E-30AC9E6EADCF

    | ----------------------------------------------------

    | Index: 0

    | Disk: disk1s2

    | Status: Online

    | Size: 803550294016 B (803.6 GB)


    +-> Logical Volume Family 394ABF57-E9A1-4F12-8701-02B66E5D2EA9


    Encryption Status: Unlocked

    Encryption Type: None

    Conversion Status: NoConversion

    Conversion Direction: -none-

    Has Encrypted Extents: No

    Fully Secure: No

    Passphrase Required: No


    +-> Logical Volume 726B0AA5-A4E1-430E-821E-C42889A46E0D


    Disk: disk2

    Status: Online

    Size (Total): 797698080768 B (797.7 GB)

    Conversion Progress: -none-

    Revertible: Yes (no decryption required)

    LV Name: Macintosh HD

    Volume Name: Macintosh HD

    Content Hint: Apple_HFS

    I have no idea how to get rid of the empty partition to resize my current "Yosemite" partition back to full 1Tb (currently 803MB in use and all the disk utilities partition tools are grayed out" :(
  2. MacUser2525 macrumors 68000


    Mar 17, 2007
    You need install USB for EC to boot from to do what you want. Apple helpfully makes it so that no previous version of OSX may delete a partition created by a later version of itself, been this way for years.
  3. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    Command-r back to recovery and from there open Terminal in the Utilities menu. Then enter the line below. That will turn off (revert) core storage on the Yosemite volume and allow you to resize it normally.

    diskutil cs revert /
  4. Julinka macrumors newbie


    Oct 29, 2017
    Oh my goodness! I spent hours online trying different solutions, none of them worked, but this simple one did!!! THANK YOU,

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