Windows 10 error code 0xc00000 bootcamp partition

The application I used in Windows was called MiniTool Partition Wizard.

After the installation, does Windows now work properly?

Excellent.

Do you see Windows files in macOS Finder? Can you post the output of

sudo gpt -vv -r show /dev/disk0

sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C

These two commands will show the GPT and the NTFS header.

Then to extend the existing Bootcamp partition using the partition I created already. I had to use Windows and it required a 3rd party application to be used to add (merge) the new partition to Windows. I would add the link here but Apple seems to be funny about that. But you can Google in YouTube "How to extend your Bootcamp Partition". Since you already have on created just make sure that partition is Fat32. Then the rest of the steps found in the video will make some since once you're in Windows.

iciconnect wrote:

Then to extend the existing Bootcamp partition using the partition I created already. I had to use Windows and it required a 3rd party application to be used to add (merge) the new partition to Windows. I would add the link here but Apple seems to be funny about that. But you can Google in YouTube "How to extend your Bootcamp Partition". Since you already have on created just make sure that partition is Fat32. Then the rest of the steps found in the video will make some since once you're in Windows.

Using GParted to Resize Your Windows 7 or Vista Partition is a very easy method, if you must extend the partition.

Methods which work on one Mac model, do not work on another. You can also buy a commercial product called Winclone, which handles it well.

Without understanding the nuances of each model, it inevitably leads to problems.

iciconnect wrote:

The application I used in Windows was called MiniTool Partition Wizard.

That specific application is one of the worst. It has no understanding of what a Hybrid MBR is and how it works. It ruins the partitions, and can cause potential data loss. It only partially works on 2014 and older Macs, only if your installation is a legacy BIOS install and leaves the GPT and MBR mismatched.

Bootcamp Partition Lost Repairing Mac Partitions is the other dangerous piece of information floating around the Internet, which causes catastrophic failures. It even references Repairing Boot Camp after creating new partition (a 103-page discussion on ASC) without realizing what was specifically being addressed in that discussion. Google searches should be handled with a grain of salt. 😉

Again if you have advance knowledge of allocation you could make anything work if you had the time. What I found worked for my needs for machines I've used. I just choice to use a method that worked for me on my 2010 Mac Pro and then on my 2015 MacBook Retina. APFS was the format used on my Macbook when I installed High Sierra. So I had to create my Windows partition using Bootcamp. Then later after having Windows running, wanted a larger hard drive size for Windows. And that's when Disk Utility was used, then Windows to extend the partition created from Mac OS's Disk Utility. Yes the type of format used can make a huge difference in Windows as to what can and will work when it comes to formatting and allocating a hard drive. Bootcamp uses a method to create and partition to install Windows which then handles the EFI instructions systematically. Note: you Do Not need to manually change anything to the EFI unless you're using a machine not manufactured by Apple. So there's is no need to do anything more then to have the OS you plan to installed on the Bootcamp partition. Once you select the OS to be installed your Mac will then boot from the OS to allow you to prepare the Hard Drive (partition created) for the installation process. Choosing NTFS for your Windows partition is a must from the setup since there is no other option to be used to format with during the OS install process.