Issue with Boot Camp with APFS drive

There are two distinct issues with High Sierra and Bootcamp.

• Time Machine Local Snapshots, or,
• APFS Corruption

From macOS Terminal, post the output of

sudo tmutil listlocalsnapshots /

Also, if you do not have Time Machine setup, it is highly recommended, in case we need to address item 2.

Can you post the output of

diskutil list

from the macOS Terminal?

We need to erase the whole disk, not just Macintosh HD.

We need to create a TM backup, boot into Internet Recovery, erase the whole internal disk (not just the partition) and restore from TM and retry the BCA.

In Applications -> Utilities -> Console, type 'disk' without quotes in the top right hand search box, and check for any disk-related messages.

In macOS Terminal, run

diskutil repairDisk disk0

and post the output.

You may need to temporarily disable SIP for the following command. Post the output of

sudo gpt -vv -r show /dev/disk0

The repairDisk error is not a good sign. We may need to create a backup (via Backup Now) and erase the whole disk and restore the TM backup to fix this issue. Before you do that, boot in Safe Mode and boot normally, and retry BCA.

If you see any errors, stop and post the output of the Terminal session.

Run

diskutil eraseVolume jhfs+ BC1 disk0s3

diskutil eraseVolume jhfs+ BC2 disk0s4

diskutil eraseVolume jhfs+ BC3 disk0s5

diskutil mergePartitions jhfs+ BCMP disk0s3 disk0s5

diskutil list

If you see only disk0s3, then

diskutil eraseVolume fat32 BOOTCAMP disk0s3

and run BC Assistant and click on Remove/Restore.

As a test, create a FAT partition of the size you want Windows to be in Disk Utility, and post any error messages you see.

Can you post the output of

diskutil list

You now have a failed installation with extra partitions, that we need to clean up, before the next attempt.

Was the FAT partition removed? If yes, retry BC Assistant and test if you can partition. Post any error messages you see.