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  1. Yes. I made a backup up-front. But still…. I had my fingers crossed.
    Anyway: it worked for me :).

    A big thank you!

  2. Hey guys. I deleted BootCamp Partition using Bootcamp assistance but it showed me an error (i don’t remember it) and now “System” is taking about 130GB of my SSD. i can not see ant other partition except Macintosh HD.
    Can anyone help me?

  3. This was really helpful. However, I believe I made a mess.

    Instead of

    diskutil eraseVolume jhfs+ BC1 disk0s3
    diskutil eraseVolume jhfs+ BC2 disk0s4

    I did the following in Terminal:
    diskutil eraseVolume jhfs+ BC1 disk0s3
    diskutil eraseVolume jhfs+ BC1 disk0s4 — [note I should have typed BC2]

    Then I typed:
    diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s4

    Now, I have like no memory on my hard drive. Out of 2TB I only have a few GB left. Something from the above has taken all of this memory.

    ———————————–
    Here is what distil shows now:

    Last login: Mon Jul 15 21:44:47 on console
    iMac:~ Michael$ 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_APFS Container disk2 121.1 GB disk0s2

    /dev/disk1 (internal, physical):
    #: TYPE NAME SIZE IDENTIFIER
    0: GUID_partition_scheme *2.0 TB disk1
    1: EFI EFI 209.7 MB disk1s1
    2: Apple_APFS Container disk2 1.7 TB disk1s2
    3: Apple_HFS BC1 171.9 GB disk1s6
    4: Apple_HFS BC1 171.2 GB disk1s3

    /dev/disk2 (synthesized):
    #: TYPE NAME SIZE IDENTIFIER
    0: APFS Container Scheme – +1.8 TB disk2
    Physical Stores disk0s2, disk1s2
    1: APFS Volume Macintosh HD 1.6 TB disk2s1
    2: APFS Volume Preboot 42.1 MB disk2s2
    3: APFS Volume Recovery 509.7 MB disk2s3
    4: APFS Volume VM 2.1 GB disk2s4

    iMac:~ Michael$

    HELP PLEASE???

  4. I have successfully installed the single partition after the above steps. But, still not able to install windows and getting the same error “The Startup Disk Cannot Be Partitioned Or Restored To A Single Partition”

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