installed bootcamp and ran gdisk, now can’t access Mac HD

In Terminal, run

gpt -vv -r show /dev/disk0

Select and Copy (Command+C) the output, quit Terminal, start Safari (Get Help Online) and Paste (Command+V) the output as a reply to this discussion.

If you converted the disk from GPT to an MBR, this would be the expected result.

leroydouglas wrote:

DesperateTimes wrote:

I ran gdisk trying to get bootcamp to work.

See if there is anything in this article:

in order to convert a MBR partition to GPT without data loss, you need to backup your important data before converting. Note: When you convert MBR to GPT, all your data on Mac will be lost.

Typically, the GPT-to-MBR does not convert the secondary GPT entries. The secondary GPT is at the end of the disk as shown in this.

sudo gpt -vv -r show /dev/disk0

Password:

gpt show: /dev/disk0: mediasize=512110190592; sectorsize=512; blocks=1000215216

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 1000215215

start size index contents

0 1 MBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 742676624 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

743086264 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

744355800 40

744355840 255858688 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

1000214528 655

1000215183 32 Sec GPT table

1000215215 1 Sec GPT header

It is possible to recover the GPT from the secondary table. GPT Fdisk will detect this and prompt the user to select from available options.

The GPT and MBR do not match. You have two options (apart from the Apple store visit, where they will just wipe your disk)

• Install High Sierra on an external disk, and boot from it and erase the MBR, or,
• Destroy/recreate the current GPT and wipe the MBR

Since you have an APFS Container, the Apple boot (29+ GB) outside the APFS container is incorrect.

Your mac will not boot as a Master Boot Record.

Start over. Reformat the drive as GUID, extended journaled (HFS+) This of course will erase the drive all data. I can only assume you have a compleete back up plan to restore any user data after formating.

You can boot into Internet Recovery or a bootable installer USB and use the DiskUtility to erase your drive and set it back up.

second— what were you trying to accomplish with gdisk? If you are trying to set up a bootcamp partition use the Bootcamp Assistant.app found in your Applications/Utilities folder.

Boot Camp - Apple Support

This looks fine. Reboot and hold Alt/Option. How many selections do you see? If you macOS, select and test, if you can boot.

Loner T wrote:

It is possible to recover the GPT from the secondary table. GPT Fdisk will detect this and prompt the user to select from available options.

Thanks. Both encouraging and insightful 😉

Hello DesperateTimes,

I think you are lucky to still be able to boot into your recovery volume. At this point, I think the best thing to do is take your machine into an Apple Store and have Apple fix it. They will be able to reinstall the operating system. I'm sorry, but your files are gone.

If the OP posts the GPT, it would be helpful. We may need to boot from an external disk macOS matching the internal disk version, install GPT Fdisk and attempt recovery.

DesperateTimes wrote:

“Destroy/recreate the current GPT and wipe the MBR”

Will I lose my data if I do this?

No. We reuse the output of the GPT command you posted and recreate it. It is a fairly quick process. Here is an example Re: disk0s2 can't mount - Partition shows as "MBR part 255" .

Can you post the output of

fdisk /dev/disk0

Recovery Console does not require sudo.

macOS High Sierra introduces APFS (Apple File System) to Mac computers. APFS replaces Mac OS Extended (HFS+) as the default file system for solid-state drives (SSDs) and other all-flash storage devices.

Post the commands that you ran in terminal.

Easy enough to see your history of command in terminal, copy and paste :

history

I got this moved over from "High Sierra" to "OS X Technologies" "BootCamp" in a good faith effort for more Unix eyes to help pick up the pieces.

In the mean time you can read through this link:

https://www.insanelymac.com/forum/topic/231025-i-lost-my-guid-paritition-label-t o-fdisk/

If there is anyway to make a backup prior to making a decisive maneuver, may well help in an effort to preserve your user data if something goes astray in trying to right the ship.

further reading on a backup plan: How to create a boot clone You can google "3-2-1 Backup Strategy" for more info.

You are on High Sierra and it was APFS?

Did you glean anything from the man page?

https://www.rodsbooks.com/gdisk/gdisk.html

The 'Operation not permitted' is related to SIP. Disable SIP using SIP - Enable and Disable steps and retry the command.