Q: Can't resize Macintosh HD partition

Hmmm... I can see the following:

Now I get the message "Ownership of the affected disk is required". Started Terminal in recovery mode and typed in the merge command.

But how? I'm in recovery mode.

Okay, this is the output:

-bash-3.2# diskutil mergePartitions disk0s2 disk0s3

Usage:  diskutil mergePartitions [force] format name

        DiskIdentifier|DeviceNode DiskIdentifier|DeviceNode

Merge two or more pre-existing partitions into one.  The first disk parameter

is the starting partition; the second disk parameter is the ending partition;

this given range of two or more partitions will be merged into one.

All partitions in the range, except for the first one, must be unmountable.

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+), it will be grown in a data-preserving manner, even if a different

file system is specified (in fact, your file system and volume name parameters

are both ignored in this case). If "force" is not given, and the first

partition is not resizable, you will be prompted if you want to erase.

If "force" is given, the first partition is always formatted. You should

do this if you wish to reformat to a new file system type.

Merged partitions are required to be ordered sequentially on disk.

See diskutil list for the actual on-disk ordering; BSD slice identifiers

may in certain circumstances not always be in numerical order but the

top-to-bottom order given by diskutil list is always the on-disk order.

Ownership of the affected disk is required.

Example: diskutil mergePartitions JHFS+ NewName disk3s4 disk3s7

         This example will merge all partitions *BETWEEN* disk3s4 and disk3s7,

         preserving data on disk3s4 but destroying data on disk3s5, disk3s6,

         disk3s7 and any invisible free space partitions between those disks;

         disk3s4 will be grown to cover the full space if possible.

-bash-3.2#

I've done the merge. Here is the output:

-bash-3.2# diskutil mergePartitions JHFS+ "Macintosh HD" disk0s2 disk0s3

Merging partitions into a new partition

    Start partition: disk0s2 Macintosh HD

    Finish partition: disk0s3 Recovery HD

Started partitioning on disk0

Merging partitions

Waiting for the disks to reappear

Growing disk

Finished partitioning on disk0

/dev/disk0

  #:                      TYPE NAME                    SIZE      IDENTIFIER

  0:      GUID_partition_scheme                        *251.0 GB  disk0

  1:                        EFI EFI                    209.7 MB  disk0s1

  2:                  Apple_HFS Macintosh HD            250.7 GB  disk0s2

-bash-3.2#

Edit: The Macintosh HD partition already has the maximum size - I don't need to do something in Disk Utility.

Edit 2: The OS X installation via Internet Recovery is running now. I'll keep you updated.

Okay, the re-installation was successful. It was not necessary to update the OS or the apps because they were already on the latest version. Everything works fine but there's still one problem. If I boot with the Alt-key, Windows is still listed.

Tested both. Windows option is still available on Alt-key-bootup.

gpt show: /dev/disk0: mediasize=251000193024; sectorsize=512; blocks=490234752

gpt show: /dev/disk0: PMBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 490234751

      start       size  index  contents

          0          1         PMBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  488555536      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

  488965176    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  490234712          7        

  490234719         32         Sec GPT table

  490234751          1         Sec GPT header

---

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors]

Signature: 0xAA55

         Starting       Ending

#: id  cyl  hd sec -  cyl  hd sec [     start -       size]

------------------------------------------------------------------------

1: EE 1023 254  63 - 1023 254  63 [         1 -  490234751] <Unknown ID>

2: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

3: 00    0   0   0 -    0   0   0 [         0 -          0] unused     

4: 00    0   0   0 -    0   0   0 [         0 -          0] unused