Macintosh HD partition delete.

Hello All,
Simply, my problem is that I do not have a selectable hardrive to either load a back up copy of timemachine or to download a copy of Yosemite.
To get to this sorry state I went through the following steps:
1. My Macbook Air SSD, was completly full so I wanted to carry out a full rebuild and start from scratch.
2. I made a full backup copy through TimeMachine and also copied my photos and other important files to an Western digital 500Gb external harddrive.
3. Restarted the Mac using Option + R, went to diskUtility, and erased the Macintosh Harddrive, ensuring that the journaled option is chosen.
4. Downloaded and successfully installed Maverick.Immedialty updgraded to Yosemite.
5. Linked Itunes to my NAS drive, and then realised that I did not copy all the iTunes cover work and structure from my local drive. Decided to revert back to the original state to get what I needed.
6. Restarted the Mac uisng Option + R and tried to use the previously saved backup from the external drive, was told that there was not enough space.
7. This is where it all starts going wrong! Went to diskutilkity and erased the partion again and then tried to use the backup, but there is no harddrive to select.
8. Back to diskutility, there is no partition indicated beneath the top level macintosh HD line item. In the partiton tab all the dropdowns and textboxes are grey out and can't be selected.
9. within the avaliable drives I do have disk1 with a OS X Base System partition.
I am unable to download or install anything and so basically stuck!
I would appreciate any help or thoughts that you may have.
Thanks for your help. Also let me know if I have posted in the wrong forum.
Cheers

You could try first to convert it to a 'normal' Mac volume by doing the following in Terminal.app
diskutil eraseVolume JHFS+ Blank /dev/disk0s6
Then try deleting it in the GUI normal DiskUtility program. If you still cannot delete then try also doing the following.
First expand the Macintosh HD partition to use all the empty space. This will not destroy any data.
Then back in Terminal.app try the following
diskutil mergePartitions JHFS+ "Macintosh HD" disk0s3 disk0s6
Note: Instead of disk0s3 use whatever corresponds to your existing Macintosh HD partition. Macintosh HD needs to be a Journaled HFS+ volume. You can use the following to list all the partitions.
diskutil list
The following is what the 'manual' for DiskUtility says
mergePartitions [force] format name fromDevice toDevice
                Merge two or more partitions on a disk.  All data on merged
                partitions other than the first will be lost.  Data on the
                first partition will be lost as well if the force argument is
                given.
                If force is not given, and the first partition has a resizable
                file system (e.g. JHFS+), the file system will be preserved
                and grown in a data-preserving manner; your format and name
                parameters are ignored in this case. If force is not given,
                and the first partition is not resizable, you are prompted if
                you want to format.  You will also be prompted to format if
                the first partition has an (HFS) Allocation Block Size which
                is too small to support the required growth of the first par-
                tition; see the -b option for newfs_hfs (8).

Similar Messages

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    w
    y
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      select Select extended partition table entry MBR
      print Print loaded MBR partition table
      write Write loaded MBR to disk
      exit Exit edit of current MBR, without saving changes
      quit Quit edit of current MBR, saving current changes
      abort Abort program without saving current changes
    fdisk: 1>

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    rpignard wrote:
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    ****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
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    Last edited by Expi1 (2014-03-06 19:54:30)

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