The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows.

Hi everyone,

I installed Windows 10 on my MacBook Pro (Retina, 15-inch, Mid 2015) with Bootcamp Assistant but had some issues running so I want to remove the partition and start over. But when I tried to remove the Windows partition with Bootcamp Assistant it gives me this error message. Previously I did use BCA to partition my hard drive and install Windows. When I go into Disk Utility there is now 2 Bootcamp Volumes alongside the Macintosh HD one.

Here are some screenshots.

This is what I get from running diskutil list, I've read elsewhere that this is important.

diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.3 GB
disk0

1: EFI EFI 209.7 MB
disk0s1

2: Apple_APFS Container disk1 296.0 GB
disk0s2

3: Microsoft Basic Data BOOTCAMP 202.6 GB
disk0s3

4: Windows Recovery 913.3 MB
disk0s4

5: Microsoft Basic Data BOOTCAMP 503.3 MB
disk0s5

/dev/disk1 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +296.0 GB
disk1

Physical Store disk0s2

1: APFS Volume Macintosh HD 177.1 GB
disk1s1

2: APFS Volume Preboot 22.5 MB disk1s2

3: APFS Volume Recovery 518.1 MB
disk1s3

4: APFS Volume VM 1.1 GB disk1s4

Any advice or help would be much appreciated.