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

Hi, all. I'm trying to remove Windows from my Mac to free up more space. However, when I try to remove it the conventional way (by using Boot Camp), I get an error that says "The startup disk cannot be partitioned or restored to a single partition." It goes on to say "The startup disk must be formatted as a single Mac OS Extended (Journaled) volume or already partitioned by Boot Camp Assistant for installing Windows." I already tried erasing the disk and unmounting it in Disk Utility. Any help would be appreciated.

MacBook, macOS Sierra (10.12.5)

Posted on Jul 15, 2017 6:33 AM

Top-ranking reply

Loner T

Level 9

59,536 points

Posted on Jul 13, 2018 7:22 PM

philip99song wrote:

Hi LonerT,

I saw that you asked for people to put in the command.

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme 251.0 GB
disk0

1: EFI EFI 314.6 MB
disk0s1

2: Apple_APFS Container disk1 202.0 GB
disk0s2

3: Microsoft Basic Data BOOTCAMP 8.0 GB disk0s3

4: Microsoft Basic Data BOOTCAMP 40.6 GB disk0s4

This should work in your case as well.

Run (only once)

diskutil eraseVolume jhfs+ BC1 disk0s3

diskutil eraseVolume jhfs+ BC2 disk0s4

diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s4

diskutil list

If you only see disk0s3, then

diskutil eraseVolume fat32 BOOTCAMP disk0s3

and now run BC Assistant and click on Restore/Remove.

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532 replies

Oct 2, 2018 8:21 PM in response to Loner T

Loner T

Level 9

59,536 points

Oct 17, 2018 2:47 PM in response to kimetime

Run

diskutil eraseVolume fat32 BOOTCAMP disk0s3

and run BC Assistant and click on Remove/Restore.

Petez9

Level 1

4 points

Nov 18, 2018 4:13 PM in response to Loner T

So I'd do:

diskutil eraseVolume AHFS BC1 disk0s3 ?

Loner T

Level 9

59,536 points

Dec 2, 2018 12:06 PM in response to rogersrusty

Did you run this part?

If you only see disk0s3, then

diskutil eraseVolume fat32 BOOTCAMP disk0s3

and run BCA and click on Restore/Remove.

Dec 2, 2018 5:01 PM in response to Loner T

Thank you. I guess I missed that part. Worked great!

Loner T

Level 9

59,536 points

Dec 8, 2018 9:42 AM in response to wkw8888

Run

diskutil eraseVolume fat32 BOOTCAMP disk0s3

and retry removing the partition using BC Assistant only.

Loner T

Level 9

59,536 points

Dec 29, 2018 4:09 PM in response to wkw8888

Run

diskutil apfs resizeContainer disk1 0g

and check.

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