I tried to resize my windows Boot Camp partition size and somhow the process accendentitly convert the mac Os partition type to "Windows_LDM"
Any idea how to revert back the MAC OS partion type ?
I cant boot mac or windows at the moment!
I have attached image of my Mac pro
Thanks in advance
We need to create a MBR using GPT Fdisk. Let me post the steps in this reply shortly.
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. Please see the sample Q&A as an example. 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. Please see the sample Q&A before you execute these steps.
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 AB): Press Enter/Return
Set the bootable flag? (Y/N): N
Creating entry for GPT partition #4 (MBR partition #4)
Enter an MBR hex code (default 07): Press Enter/Return
Set the bootable flag? (Y/N): Y
We need to create a MBR using GPT Fdisk. Let me post the steps in this reply shortly.
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. Please see the sample Q&A as an example. 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. Please see the sample Q&A before you execute these steps.
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 AB): Press Enter/Return
Set the bootable flag? (Y/N): N
Creating entry for GPT partition #4 (MBR partition #4)
Enter an MBR hex code (default 07): Press Enter/Return
Set the bootable flag? (Y/N): Y
We are going to destroy and recreate the GPT. This is your current GPT (based on your GDisk output) which you can verify.
If you get any errors in etc following steps, stop and post the error message(s).
The steps are
Type 'p' and post the output, before we go further.
We need a 'full' installation of macOS, not a bootable disk. Do not install Mountain Lion. The macOS version must match the version of macOS you had on the internal disk, before we can repair the internal disk.
done
Rehmans-MacBook-Pro:~ root# diskutil repairdisk disk0
Repairing the partition map might erase disk0s1, proceed? (y/N) y
Started partition map repair on disk0
Checking prerequisites
Checking the partition list
Adjusting partition map to fit whole disk as required
Checking for an EFI system partition
Checking the EFI system partition's size
Checking the EFI system partition's file system
Checking all HFS data partition loader spaces
Reviewing boot support loaders
Checking Core Storage Physical Volume partitions
Updating Windows boot.ini files as required
The partition map appears to be OK
Finished partition map repair on disk0
Can you post a text version for the record, before we make any changes?
GPT 17 and GPT 19 can be deleted, once you post the text version. Let me know if you need the exact commands.
You need to run Startup Repair using an external Windows installer. In your BC Assistant UI, you should have three options - Create, Download and Install. You will need to build a USB2 Flash drive installer using Create+Download and boot from it.
Good. In GPT Fdisk, type d 17 d 19 p w y and check if your GPT shows you a better output.
Run
sudo gdisk -l /dev/disk0
and check.
Can you run
diskutil repairDisk disk0
What external devices do you have connected to the Mac when you see this error?
Thanks Loner T.
I created an bootable USB for Mac_OS_X_Mountain_Lion_10.8.5 but the startup manager is not displaying this USB hard disk.
I used TransMac in windows to create this bootable drive !
I have tried this below tips but didnt worked
I dont see y command in the gdisk command list
Command (? for help): ?
b back up GPT data to a file
c change a partition's name
d delete a partition
i show detailed information on a partition
l list known partition types
n add a new partition
o create a new empty GUID partition table (GPT)
p print the partition table
q quit without saving changes
r recovery and transformation options (experts only)
s sort partitions
t change a partition's type code
v verify disk
w write table to disk and exit
x extra functionality (experts only)
? print this menu
And if I delete single partition using d 17 and then w command raise error below
Command (? for help): d 17
Partition number (1-18): 17
Command (? for help): w
Warning! Main partition table overlaps the first partition by 34 blocks!
You will need to delete this partition or resize it in another utility.
Aborting write of new partition table.
Hi Loner, below is the output for diskutil list, disk 1 is the USB drive with macOS
------------------------------------------------------------------------------------
Rehmans-MacBook-Pro:~ root# diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *500.3 GB disk0
1: Windows_LDM 150.3 GB disk0s1
2: Windows_LDM 349.5 GB disk0s2
3: Windows_LDM 471.9 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *32.1 GB disk1
1: EFI 209.7 MB disk1s1
2: Apple_HFS MacOs 31.2 GB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
/dev/disk5
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme *22.0 MB disk5
1: Apple_partition_map 32.3 KB disk5s1
2: Apple_HFS Mac Free Any Data Re... 22.0 MB disk5s2
/dev/disk6
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *122.9 MB disk6
1: Apple_HFS Mac Any Data Recovery 122.8 MB disk6s1
Mac OS partition type change to Windows_LDM during boot camp resize
