Apple Event: May 7th at 7 am PT
I created a second partition on my rMBP's SSD in order to install a bootable beta copy of El Capitan. I'd now like to delete this partition but am unable to. The minus button in Disk Utility is greyed out. A cursory search online suggests that this has something to do with the partition being turned into a Core Storage volume.
How do I go about deleting this partition?
Main partition running OS X 10.10.4
iMac, Mac OS X (10.0.x), 2009 27" iMac
Open Disk Utility, select the second volume in the sidebar. Click on the Erase tab in the main window and click on the Erase button. Please backup the first partition in case this fails.
To delete second partition in MAC after installing beta release or Boot Camp on MAC do the following:-
1) Press and hold Command + R and Press power on while holding cmd + R keys to boot the MAC in recovery mode.
2) Go to Disk Utility and select Main SSD/HDD on left side and on right side of the screen click on Partitions.
3) Delete the second partition by selecting it and clicking on “ - “ key.
4) Then click on 1st partition and drag it completely upto end on the disk map.
5) Click on apply.
6) Shutdown from above menu.
7) Power on and immediately after the display turns grey, press and hold Command + Option + P + R and continue holding until you’ve heard the system chimes 3 times.
8) Boot Normally.
Point 7 is only for people having issues of slow booting to Mac OS X but there is nothing wrong doing this step.
You didn't read a word I wrote, did you?
I am not able to understand what problem you are facing now. I have mentioned step by step wise clearly...
Late 2009 27" iMac
El Capitan 10.11
Same problem trying to delete second disc partition located for Boot Camp after upgrading to El Capitan. (Was never able to get past the black screen when trying to install Windows 7 on a Boot Camp partition, despite following all of the numerous recommendations).
Solution was straight forward to remove unwanted second partition.
Logged in to e-drive (Techtool Pro 8) on external backup created by Carbon Copy Cloner and still running Yosemite.
In e-drive clicked on disc utility and was able to delete bootcamp partition and resize the primary partition in the usual way.
John
Old thread but I was still dealing with this issue. Fixed this using the 10.11 disk utility without a startup disk or anything like that.
My situation: I had 10.11 installed on a smaller partition, 10.10 was on a larger partition. I wanted to remove the 10.10 partition and give that space to the 10.11 partition but I couldn't delete the 10.10 partition because it was the main partition and deleting this was disabled in the partition pie chart.
- I booted into recovery mode and ran the disk utility
- I erased the contents of the larger 10.10 partition
- I then did an Edit->Restore... command on the larger partition and specified to use the contents of the smaller 10.11 partition. This created two duplicate partitions, one larger, one smaller
- Then I erased the data on the smaller partition and deleted it, and gave the space to the larger one.
- I now have 1 single 10.11 partition with all the available space
Hope this helps.
One possible method to address this (a workaround) is to Erase the extra partition and format as FAT32, then go into Boot Camp Assistant and it will prompt to remove the "Windows partition". I did that with a misbehaving Bootcamp partition — accidentally erased it to become Mac OS X Extended Journaled, thinking it would transform it into a unified partition (it didn't). Erased again back to FAT32 (no Windows install), and Boot Camp Assistant took it from there.
open Termina
diskutil list
diskutier mergePartitions JHFS+ NewName disk0s1 disk0s4
NewName = Any name for new volume
disk0s1 = first partition that you wanna merge
disk0s4 = second partition you wanna merge into one
3 sec later Voila!
Pozdrav
Can't delete second partition
