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I have a 13" Early-2015 MBP Retina in which I am trying to install Windows 8.1 on. When I went into bootcamp, I received the ever so common error of: enter image description here

When I went to the newly designed disk utility, it told me I had 2 partitions. Of course, I knew this couldn't be true, so i went into terminal and typed diskutil list and got:

bash-3.2# diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh SSD           81.0 GB    disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:                  Apple_HFS Data                    39.3 GB    disk0s4
/dev/disk1 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh SSD          +80.6 GB    disk1
                                 Logical Volume on disk0s2
                                 9839618F-7659-4E0C-BF5C-48B0C94D5E37
                                 Unencrypted

I want to know:

  1. Which partition to delete
  2. How to delete it in a (preferably safe) way that would make my hard disk "clean" of everything but my main Macintosh HD partition

Thanks!

1

You have to delete the Data partition. disk1 (Macintosh SSD) is no real partition/disk but a virtual volume residing in disk0s2 but containing your system.

  1. Backup the content of Data
  2. Open Disk Utility
  3. Choose the superior disk and hit "Partition":

    enter image description here

  4. Click on the Data partition and hit the - button:

    enter image description here

  5. Click Apply

    The Data partition will be removed, the Recovery HD moved to the end of the disk and Macintosh SSD will be expanded:

    diskutil list #before
    /dev/disk0 (internal, physical):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      GUID_partition_scheme                        *68.7 GB    disk0
       1:                        EFI EFI                     209.7 MB   disk0s1
       2:          Apple_CoreStorage System                  51.2 GB    disk0s2
       3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
       4:                  Apple_HFS Data                    16.5 GB    disk0s4
    /dev/disk1 (internal, virtual):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:                  Apple_HFS System                 +50.9 GB    disk1
                                     Logical Volume on disk0s2
                                     4AACDE41-E3A1-444A-A5F6-C1491F46149E
                                     Unencrypted
    diskutil list #after
    /dev/disk0 (internal, physical):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      GUID_partition_scheme                        *68.7 GB    disk0
       1:                        EFI EFI                     209.7 MB   disk0s1
       2:          Apple_CoreStorage System                  67.9 GB    disk0s2
       3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
    /dev/disk1 (internal, virtual):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:                  Apple_HFS Macintosh SSD          +67.5 GB    disk1
                                     Logical Volume on disk0s2
                                     4AACDE41-E3A1-444A-A5F6-C1491F46149E
                                     Unencrypted
    

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