Last night, I was booted my MacBook Pro and it was working find, after a few minutes restarted my MacBook Pro with Bootcamp. But then it showed a screen with a circle a line through it. I noticed that my MBP was kind hot ( unusual after using it for few minutes).

I did reboot MBP in internet recovery mode, but did not help. MPB boots in Windows 7 bootcamp with no issues. According to apple help, I did try to recover the disk in Disk Utility, it did not work. As you can see the is no issue with the main drive. It shows two partitions: Dsisk2s2 & BootCamp.

two partitions: disk2s2 & BootCamp

My files are on disk2s2 shown below, however, as you can see both Verify Disk and Repair Disk buttons are dimmed! When I click on Mount botton, nothing happens. I did also try to mount it from File menu, but was not helpful.

enter image description here

Next I tried to see if I can reinstall MacOS ( the version installed was Mac Mojave). The reinstallation of MacOS ( although Mountain Lion), was unsuccessful as it only shows BootCamp partition which is locked and cannot reinstall MacOS in it.

enter image description here

Is there anyway I can without erasing the Partition fix my MBP. This is my music studio main computer and I have tons of software and files in it.

I do appreciate any help.

  • Can you tell us… what options you see if you boot holding down the Option key [Alt] & also what you see if you start from 'regular' recovery [Cmd/R at the chimes]. Part of the issue I can see when you're booted from Internet Recovery is you have an old Recovery [the '3D' dots in window corners are a dead giveaway]. Mountain Lion cannot see APFS formatted drives, which is what Mojave will be - that's why it's just showing disk2s2 instead of the volume name.
    – Tetsujin
    Commented Aug 14, 2023 at 18:29
  • Thank you so much. holding down the Option key [Alt]: Only Windows to select. holding down the Option key [Alt]: Starting Internet recovery This may take a while. What is the fix then, please?
    – chikitin
    Commented Aug 15, 2023 at 13:13
  • We don't know yet, because the version of Recovery cannot see your boot drive anyway. You need to get into a Recovery that is new enough, before you can do any diagnosis. Internet recovery ought to use the latest version your Mac can run. The first useful sign when it loads is that the dots top left will be 'flat' colours i.sstatic.net/OIoRX.png , not 3D i.sstatic.net/Bw3ZL.png
    – Tetsujin
    Commented Aug 15, 2023 at 13:19
  • can't I create a Mac Mojave bootable installer for macOS - instruction on Apple Support or create a bootable recovery on a flash drive and run them w.o. losing my files?
    – chikitin
    Commented Aug 15, 2023 at 13:31
  • @Tetsujin: Isn't this just another one of those darn FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF problems? Commented Aug 15, 2023 at 13:42

1 Answer 1


Duplicate Question

A question is often considered to be a duplicate if one or more of the posted answers to the earlier question can be applied to both questions. In your case, your question is a duplicate of the question OS volume shows as type 'FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF', where the partition type is APFS. However, I would encourage you to use the alternative simpler solution given below.

Alternate Simpler Solution

The following steps will fix an error in the GUID Partition Table (GPT) stored on the Mac's internal drive.

  1. Boot to Windows 7.

  2. Download the project GPT fdisk. This should place the file gdisk-windows-1.0.9.zip in your Downloads folder.

  3. Use the Windows Explorer to copy the gdisk64.exe and sgdisk64.exe from the gdisk-windows-1.0.9.zip file to your Downloads folder.

  4. Open an "Administrator: Command Prompt" window and enter the following commands.

    cd /d %userprofile%\Downloads
    sgdisk64 -t 2:af0a 0:


  • Thank you, after I did your step 4. I restarted my computer with Alt and it showed two bootable (Windows 7 and Macintosh HD). After I chose Macintosh HD to boot, it showed the cirle with a line trough it! When I did internet recovery, It change the Partion type to 7C3457EF-0000-11AA-AA11-00306543ECAC instead of FFF. What should I do please? Thank you very mcuh again.
    – chikitin
    Commented Aug 20, 2023 at 9:21
  • You can try using Option-Command-R key combination during startup. This might offer the latest macOS that is compatible with your Mac. Open a Terminal window and enter the commands sw_vers and diskutil list internal. Post the output to your question. Commented Aug 20, 2023 at 9:59
  • $ sw_vers > Mac OS X, 10.15.7, BuildVersion 19.H2. $diskutil list internal > Terminal - _ _bash - 80×10 /dev/disk2 (synthesized): B: TYPE NAME 1:APFS Container Scheme 2:Physical Store disk@s2 3:APFS Volume Preboot 4:APFS Volume Recovery APFS Volume VM APFS Volume Macintosh HD -bash-3.2# SIZE +374.4 GB 24.1 MB 507.6 MB 1.1 GB 164.1 GB IDENTIFIER disk2 disk2s2 disk2s3 disk2s4 disk2s5
    – chikitin
    Commented Aug 21, 2023 at 13:57
  • Yes, it offers Catalina. Due to old hardware, I should install Mojave and not 10.15. I uploaded the screenshot: ibb.co/cTpZBwW
    – chikitin
    Commented Aug 21, 2023 at 14:02
  • My disk utility changed, please find an image of my Disk Utility at ibb.co/wM5z4pW
    – chikitin
    Commented Aug 23, 2023 at 6:52

Not the answer you're looking for? Browse other questions tagged .