Windows Boot Camp Partition replaced by System Reserved after installation

"We can rebuild the MBR from GPT using GDisk."

I am having a hard time to get a grasp of what that actually means. I glanced over the MBR wiki and I realize I have no idea what MBR and GPT really are.

What exactly is wrong with the MBR ?

Sorry if my curiosity makes this more complicated then it is. Maybe at this point its easier if you could just give me a rundown of how to use gdisk to accomplish this. And maybe I automatically get a better understanding of everything afterwards.

Alright one last try of figuring this out myself.

I found these instructions on stackexchange.

I think thats it, right?

Rebuild MBR to match the new GPT information thus resetting the

Hybrid MBR. Use defaults for other questions (like partition codes). The

only values that need modifications are the Boot flags and step 10.

Accept all other defaults that Gdisk offers. These steps can be repeated

if you make a mistake before you get to Step 12, otherwise start from

Step 1 for these steps. Step 6 has numbers which are typed with a space

between the numbers.

1. sudo gdisk /dev/rdisk0
2. P (Print list of parts)
3. R (Recover)
4. O (print current Hybrid MBR)
5. H (chooses Hybrid)
6. Partitions numbers to be hybridized: 2 3 4
7. Y (Good for GRUB question)
8. N (part 2 boot flag), N (part 3 boot flag)
9. Y (part 4 boot flag make NTFS bootable partition)
10. O (print current Hybrid MBR)
11. W (Write the new MBR)
12. Y (Yes! write the new MBR)
13. Reboot

To make Windows bootable again try the following:

Boot from your Windows DVD/USB-Stick

Open command prompt from Windows recovery option menu. Type “diskpart” at the command prompt.

At the DiskPart prompt, type in “list disk”. You will see the list of disk currently attached to your computer.

Now type in “select disk n”, where n is the disk number. In this example, disk 0 is selected.

Now that correct disk is selected, type in “list partition” to get a list of all the partitions on that disk.

To select the partition you want to set as active, type in “select partition n”, where n is the partition number (probably 3).

Now that you have selected the disk and partition, mark it as

active by just typing the word “active” and pressing Enter. Now the

partition is set active.

Exit from the command prompt and run startup repair.

Except, I assume in my case I have to set bootflag on partition 3.

So step 6. looks like this: Partitions numbers to be hybridized: 2 3

And at step 8. I press N only once

And I dont understand what step 7. "Y (Good for GRUB question)" is meaning/doing, I guess its setting bootflag for the EFI so I can boot into MacOS?

Is it normal that gdisk still doesnt show the partition name?

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640       857831527   408.9 GiB   AF0A  Mac OS X SSD
   3       857833472       976773119   56.7 GiB    0700  

Ok so I have made some progress.

First of all, I figured out that in order to get rid of all virtualbox errors I had to execute the chown commands again and also unmount the partition, each time after I reboot my Macbook.

sudo chown $USER /dev/disk0s3
sudo chown $USER /dev/disk0s1
sudo chown $USER /dev/disk0
diskutil unmount /dev/disk0s3

There was no need to create a new .vmdk at all.

Then I tried to reinstall windows and rebuild the hybrid MBR again with gdisk.

It seemed like nothing worked until I checked the Startup Disk in my MacOS Settings.

NOW I see it!

I figured out that I had to mount it in order to show up in Startup Disks.

Anyway, I still cant chose it from the startup screen. When I hold alt/option I only see my Mac OS SSD.

My new problem is:

When I use Startup Disk to Restart into "Untitled Windows" after 10 sec of grey screen I get stuck at a black screen with blinking cursor. (I waited more than 10 min)

I tried windows repair command prompt:

Bootrec.exe /FixMBR
Bootrec.exe /FixBoot
Bootrec.exe /RebuildBcd

But nothing changed...