Bootcamp "The startup disk cannot be partitioned or restored to a single partition" error.

Hey Loner T.

Having the same issue and hoping you can help.

Diskutil list –

/dev/disk0 (internal):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                         251.0 GB   disk0

   1:                        EFI EFI                     314.6 MB   disk0s1

   2:                 Apple_APFS Container disk1         154.0 GB   disk0s2

   3:       Microsoft Basic Data OSXRESERVED             8.0 GB     disk0s6

   4:                 Apple_APFS Container disk2         88.7 GB    disk0s4

/dev/disk1 (synthesized):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      APFS Container Scheme -                      +154.0 GB   disk1

                                 Physical Store disk0s2

   1:                APFS Volume Macintosh HD            79.3 GB    disk1s1

   2:                APFS Volume Preboot                 45.0 MB    disk1s2

   3:                APFS Volume Recovery                512.8 MB   disk1s3

   4:                APFS Volume VM                      4.3 GB     disk1s4

/dev/disk2 (synthesized):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      APFS Container Scheme -                      +88.7 GB    disk2

                                 Physical Store disk0s4

   1:                APFS Volume BOOTCAMP                757.8 KB   disk2s1

I am trying to install Windows onto my MAC and I get this error. Here is my diskutil list. Help Please.

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *3.0 TB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Macintosh HD 3.0 TB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk4 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: Boot Camp +1.4 GB disk4

Hi there, long time following this thread but haven't had time to try fixing it until now. I appreciate any and all help!

Here's my info after a restart:

/dev/disk0 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *3.0 TB     disk0

   1:                        EFI EFI                     209.7 MB   disk0s1

   2:                 Apple_APFS Container disk2         2.5 TB     disk0s2

   3:       Microsoft Basic Data BOOTCAMP                501.3 GB   disk0s3

   4:           Windows Recovery                         505.4 MB   disk0s4

/dev/disk1 (internal):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                         121.3 GB   disk1

   1:                        EFI EFI                     314.6 MB   disk1s1

   2:                 Apple_APFS Container disk2         121.0 GB   disk1s2

/dev/disk2 (synthesized):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      APFS Container Scheme -                      +2.6 TB     disk2

                                 Physical Stores disk1s2, disk0s2

   1:                APFS Volume Macintosh HD            1.3 TB     disk2s1

   2:                APFS Volume Preboot                 43.2 MB    disk2s2

   3:                APFS Volume Recovery                509.7 MB   disk2s3

   4:                APFS Volume VM                      2.1 GB     disk2s4

Hi,I am trying to remove windows from Mac using BCA , but I get a a message ‘The startup disk must be formatted as a single Mac OS Extended (journaled ) volume or already portioned by boot camp Assistant for installing windows . So can u give the solution for this problem . Thanks

In Terminal run

diskutil eraseVolume fat32 BOOTCAMP disk0s4

and retry removing the partition using BC Assistant only. Do not use Disk Utility.

Now you should be able to partition and install Windows via BCA. I recommend a macOS Time Machine backup before you attempt it again.

Loner T

Thank you, it worked. Also, I liked the very quick response!

Chuck

THANKS a lot for the quick answer ... worked 100%.

Merry Christmas for you LonerT

Merry X'Mas to you and yours, keizer27 . Please remember to back up macOS, before you try to re-install Windows.

Loner T, seeing as you are the designated Guru here, could I also get some help?

User error on my part, all good to go here.

Please help me, I already used some of the commands listed here but forget which ones they were, thanks!!

Super... Loner T, THANKS a lot, worked 100%.

I may have gummed it up even worse now, but I tried another command and it has changed my list to the following. Thanks for any and all help!

How do you have the Apple_Boot drive? What have you tried so far?