Fix Bootcamp Error After Updating Windows 10

The error

BootCamp Error

The issue: https://support.apple.com/en-us/HT203913

Disk Utility app no longer lists hidden(unmounted) partition, which in my case is "Windows Recovery"(disk0s4), let alone removing it. diskutil list is the alternative. 

➜  ~ diskutil list
/dev/disk0 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         1.0 TB     disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:                 Apple_APFS Container disk1         745.0 GB   disk0s2
   3:       Microsoft Basic Data BOOTCAMP                254.3 GB   disk0s3
   4:           Windows Recovery                         899.7 MB   disk0s4

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +745.0 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume :                       202.1 GB   disk1s1
   2:                APFS Volume Preboot                 23.6 MB    disk1s2
   3:                APFS Volume Recovery                517.8 MB   disk1s3
   4:                APFS Volume VM                      1.1 GB     disk1s4

The fix

Why "Free Space"? from man diskutil

If you specify Free Space for format, the partition itself is deleted (removed entirely) from the partition map instead of merely being erased.

Deleting the partition in addition to merely erasing it is what I want.

  • Deleting the partition: 

➜  ~ diskutil  erasevolume  "Free Space"  ""  /dev/disk0s4
Started erase on disk0s4
Unmounting disk
Finished erase on disk0

  • list again: 

➜  ~ diskutil list
/dev/disk0 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         1.0 TB     disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:                 Apple_APFS Container disk1         745.0 GB   disk0s2
   3:       Microsoft Basic Data BOOTCAMP                254.3 GB   disk0s3

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +745.0 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume :                       202.1 GB   disk1s1
   2:                APFS Volume Preboot                 23.6 MB    disk1s2
   3:                APFS Volume Recovery                517.8 MB   disk1s3
   4:                APFS Volume VM                      1.1 GB     disk1s4

The partition is deleted but the "Free Space" is not listed.

References:

How to remove a partition with diskutil: https://apple.stackexchange.com/questions/235568/merge-partitions-with-macintosh-hd another way to fix that requires deleting bootcamp partition:

yet another way using gdisk: https://forums.macrumors.com/threads/the-startup-disk-cannot-be-partitioned-or-restored-to-a-single-partition-error-in-boot-camp-assist.2110495/

bootcamp