Level 1

8 points

Boot Camp partition became unbootable after changing Paragon NTFS settings

Hi everyone, hopefully you can help me out.

I installed Boot Camp with Windows 10 on my Late 2014 Mac Mini under Mojave. At the time I was running Paragon NTFS which had been working fine and continued to do so after the Boot Camp install. The one thing I noticed was that the bootcamp partition wasn't visible under System Preferences/Startup Disk so I wasn't able to launch bootcamp from there as I can on my High Sierra Macbook but no problem - I just hold option at boot and launch windows that way.

Yesterday I was in the Paragon NTFS preferences and I noticed that there was an option to mount the bootcamp partition as bootable (possibly worded differently - can't quite recall) which I selected. My bootcamp drive then appeared under system preferences/startup disk so I selected it and clicked restart.

I then got a black screen with "No bootable device -- insert boot disk and press any key"

I restarted the mac and held the option key and the only bootable partition that was appearing was my Mac OS one. Since then I've been trying desperately to fix this.

I've read some threads by LonerT. I've uninstalled Paragon NTFS but it hasn't helped. I think Paragon NTFS has screwed up my MBR but I'm a bit of a noob and my partition table seems a lot more complicated than what i've seen in other threads (possibly due to having a Fusion Drive?).

I've tried following some of the other threads but I'm lost. Any help?

Mac mini, macOS Mojave (10.14)

Posted on Nov 23, 2018 5:17 PM

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22 replies

Loner T

Level 9

59,536 points

Nov 24, 2018 5:25 AM in response to DJ Callyman

Type 'n' and continue. Can you post the output of step 2?

DJ Callyman Author

Level 1

8 points

Nov 24, 2018 1:54 PM in response to Loner T

Ok here it is:

DJ Callyman Author

Level 1

8 points

Nov 24, 2018 11:57 PM in response to Loner T

Ok I completed the steps and rebooted. The bootcamp partition still doesn't appear at startup when I hold the option key.

DJ Callyman Author

Level 1

8 points

Nov 25, 2018 12:05 AM in response to DJ Callyman

Here's the output from the last part of the process.

Loner T

Level 9

59,536 points

Nov 26, 2018 2:47 AM in response to DJ Callyman

Can you select Windows in System Preferences and switch to Windows successfully?

DJ Callyman Author

Level 1

8 points

Nov 26, 2018 3:30 AM in response to Loner T

Unfortunately not. Attempting to do so results in a blinking cursor as pictured:

Loner T

Level 9

59,536 points

Nov 23, 2018 6:54 PM in response to DJ Callyman

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 7. Accept all other defaults that Gdisk offers. Please see thesample Q&A as an example. These steps can be repeated if you make a mistake before you get to Step 13, otherwise start from Step 1 for these steps. Step 6 has numbers which are typed with a space between the numbers. Please see the sample Q&A before you execute these steps.

Sudo gdisk /dev/rdisk0
P (Print list of parts)
R (Recover)
O (print current Hybrid MBR)
H (chooses Hybrid)
Partitions numbers to be hybridized: 2 3
Y (Good for GRUB question)
N (part 2 boot flag)
Y (part 3 boot flag make NTFS bootable partition)
O (print current Hybrid MBR)
W (Write the new MBR)
Y (Yes! write the new MBR)
Reboot

Here is sample Q&A for this section. Please notice the Press Enter/Return.

Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y

Creating entry for GPT partition #2 (MBR partition #2)

Enter an MBR hex code (default AF): Press Enter/Return

Set the bootable flag? (Y/N): N

Creating entry for GPT partition #3 (MBR partition #3)

Enter an MBR hex code (default 07): Press Enter/Return

Set the bootable flag? (Y/N): Y

Test 1 - Does Bootcamp Volume show up in Finder?

Test 2 - Can you see files in Bootcamp Volume?

Test 3 - Can you select Bootcamp in System Preferences -> Startup Disk?

Test 4 - If Test 3 is successful, select Bootcamp and Click Restart.

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Boot Camp partition became unbootable after changing Paragon NTFS settings