Fix The startup disk cannot be partitioned or restored to a single partition boot camp

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Boot camp assistant

If the startup disk cannot be partitioned or restored to a single partition, please try the following tips.

The first step in fixing this error is performing a full backup of macOS. This can be accomplished using back Time Machine however the same cannot backup your Windows partition.

Follow these steps to fix this boot camp error

Updating your OS is one option.

  • On your Mac,
  • Go to Apple menu
  • Select System Preferences,
  • Click Software Update.

If the error persists, follow these steps:

  • Launch the Terminal app on your Mac. You can do this by going to Applications > Utilities > Terminal
  • Enter commands (Listed under) and press enter:

diskutil list

diskutil cs list

This message will show up (sizes might differ based on the specs of your machine.)

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme 251.0 GB disk0

1: EFI EFI 314.6 MB disk0s1

2: Apple_CoreStorage Macintosh HD 201.3 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Apple_HFS BOOTCAMP 40.6 GB disk0s4(This is the boot camp disc)

/dev/disk1 (internal, virtual):

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#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD +201.0 GB disk1

Logical Volume on disk0s2

7D769077-39D6-4422-B73D-101B2C819B29

Unlocked Encrypted

 

Go to Terminal, enter these commands:

diskutil eraseVolume fat32 BOOTCAMP disk0s4

Run Boot Camp assistant.

 

In case of Windows, Bootcamp or Microsoft disks, as these ones:

 

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_APFS Container disk1 414.4 GB disk0s2

3: Microsoft Basic Data BOOTCAMP 84.6 GB disk0s3

4: Windows Recovery 471.9 MB disk0s4

 

/dev/disk1 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme – +414.4 GB disk1

Physical Store disk0s2

1: APFS Volume Macintosh HD 240.1 GB disk1s1

2: APFS Volume Preboot 22.5 MB disk1s2

3: APFS Volume Recovery 506.6 MB disk1s3

4: APFS Volume VM 2.1 GB disk1s4

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/dev/disk2 (disk image):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme +996.8 GB disk2

1: EFI EFI 209.7 MB disk2s1

2: Apple_HFS Cópias de segurança … 996.4 GB disk2s2

 

In case of Microsoft data as in  # 3 and 4 enter commands in Terminal  then press enter:

 

diskutil eraseVolume jhfs+ BC1 disk0s3

diskutil eraseVolume jhfs+ BC2 disk0s4

diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s4

diskutil list

 

Only disk0s3,should show on your screen:

 

Enter the following command in Terminal:

 

diskutil eraseVolume fat32 BOOTCAMP disk0s3

 

At times three disks related to Windows data,show up like:

 

/dev/disk0 (internal):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme 121.3 GB disk0

1: EFI EFI 314.6 MB disk0s1

2: Apple_APFS Container disk1 71.0 GB disk0s2

3: Microsoft Reserved 16.8 MB disk0s3

4: Microsoft Basic Data BOOTCAMP 48.9 GB disk0s4

5: Windows Recovery 470.8 MB disk0s5

 

/dev/disk1 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme – +71.0 GB disk1

Physical Store disk0s2

1: APFS Volume Macintosh HD 62.2 GB disk1s1

2: APFS Volume Preboot 19.6 MB disk1s2

3: APFS Volume Recovery 506.6 MB disk1s3

4: APFS Volume VM 2.1 GB disk1s4

 

The disks3, 4 and5 are Windows data. In case, these show up then enter the listed commands in Terminal:

diskutil eraseVolume jhfs+ BC1 disk0s3

diskutil eraseVolume jhfs+ BC2 disk0s4

diskutil eraseVolume jhfs+ BC3 disk0s5

diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s5

diskutil list

Disk0s3, should show. Enter the following command in Terminal:

diskutil eraseVolume fat32 BOOTCAMP disk0s3

Then run Boot Camp

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