Bootcamp Partition No Longer Mounted

Reboot and hold Alt/Option and check available selections. If you see macOS, select it and check that it boots correctly. If it does, then we can use GDisk to correct the MBR and test Windows.

This is not a valid NTFS header. Can you use El Capitan has deleted my bootcamp windows partition as a reference and download Testdisk and start a scan with Quick Search?

Can you boot back into Internet Recovery and post the output of

diskutil apfs list

I would be willing to bet that MPT has deleted the boot partition from windows keeping it from mounting (therefore booting). This would require a removal of Boot Camp and start from scratch. Curious to see what you find.

Using the steps in Re: El Capitan has deleted my bootcamp windows partition, your values in the Rebuild GPT section (the first part) are

• Step 7 - ( - Start offset in sectors or the start point for Bootcamp part) - 714960896
• Step 8 - ( - Size offset, as opposed to End offset) - 222740473

Your steps will remain the same for Rebuild MBR section, because these are derived from the first part.

There is an issue with the current layout. Notice the entry 2 ends at 800985087, so we cannot use a the start address of 714960896. Since Testdisk shows valid files, this requires GPT2 to be deleted and recreated and ended before NTFS starts. Overlapping partitions are not allowed.

Do you have a backup of macOS?

Correct. You will need to delete GPT2 and GPT3, both, and rebuild both of them.

GPT2 will be

• Step 7 - ( - Start offset in sectors or the start point for macOS part) - 409640
• Step 8 - ( - End offset) - 714960895

GPT3 will be

• Step 7 - ( - Start offset in sectors or the start point for Bootcamp part) - 714960896
• Step 8 - ( - Size offset, as opposed to End offset) - 222740473

Notice that the end of GPT2 is one sector less than the start of GPT3.

From macOS Terminal, post the output of

diskutil list

sudo gpt -vv -r show /dev/disk0

sudo fdisk /dev/disk0

Now run

diskutil repairDisk disk0

Run

diskutil unmountDisk disk0

gpt remove -i 2

gpt remove -i 3

gpt add -i 2 -b 409640 -s 714551256-t apfs /dev/disk0

diskutil unmountDisk disk0

gpt add -i 3 -b 714960896 -s 222740473 -t windows /dev/disk0

gpt -vv -r show /dev/disk0

and post the output.

Ah, but we have a way back. 😉. In Internet Recovery, click on Restore from Time Machine, connect your TM disk, and restore it back to the current APFS partition. Do not erase any partitions except the designated APFS partition.

howie8594 wrote:

The restore is done, and everything’s working normally.

Assuming macOS is working, can you check if the Windows partition is now properly visible in macOS Finder with Windows files? If yes, you can re-create the MBR using the GDisk steps and test booting Windows. You may need Startup Repair or Bootrec.exe to address MBR/Boot Sector issues.

You already have GPT2 and GPT3. There is not need to rebuild the GPT. You just need to rebuild the MBR once, using the example, but you have '2 3' instead of '2 3 4' and your GPT3 is bootable. If you need the exact steps, let me know.

Do not overwrite the GPT yet. Let me build the correct steps. We should do this in Internet Recovery. Can you boot into Internet Recovery by holding Command+Opt+R during Boot?

You will need Startup Repair using the Windows Installer created by BCA using the first two options - Create and Download.