On reboot it showed the cannot boot from hard drive ? screen.

I rebooted into recovery mode but it fails to mount the drive. I can see the drive there with the correct details. It says the following:

Could not mount "disk0s2" (com.apple.Diskmanagement.dis enter error -119930868.)
I googled the error but get lots of posts relating to external drives etc. Nothing in any posts I've come across has helped.

When i run FistAid on the drive it get the following:

Repairing Storage System
Performing fsck_apfs -y -x /dev/disk02s2
warning: nx_block_count is 488475719, while device block count
error: object (oid 0x1): o_cksum (0xbd26e8008dccb575) is invalid for object
Checking the container superblock.
Storage system exit code is 8.
Storage system verify or repair failed. :(-69716)

Operation failed.

If i do "disk util apfs list" in terminal i get the following:
Container ERROR -69808
APFS Container reference: disk1
Size (Capacity Ceiling): ERROR -69620
Capacity in use by volumes: ERROR -69620
Capacity not allocated: ERROR -69620
+-< Physical Store disk0s2
  APFS Physical Store Disk: disk0s2
  Size: 1894999998464 B (1.9 TB)

I need some photos and files off the drive so if anyone can help it would be very much appreicated!


The 16 MacBook Pro is Intel based and has the T2 chip. This means all the data is well encrypted and the keys are stored on the T2 and the system will unlock all of the system data in target mode and other pass phrases may also be able to decrypt the data with FileVault enabled.

I would revive the firmware if you can’t use your known passwords to try and transfer (but not run first aid) to a second Mac.

Do not restore - the steps are very similar and the words sound too close for comfort. Restore intentionally deletes and destroys all data.

Revive leaves your data intact. Now, if your data is already gone, you won’t know until after the revive is done. It’s unlikely revive will make it harder or more expensive to do data recovery, but I would stop immediately with any fsck since that deletes files and restores the system to a previous state to make the filesystem correct. It’s the opposite of what you want to get files backed up.

For that you want these:

Then once you have the files backed up, use Internet Recovery to try reinstalling macOS on top of your existing data (this also doesn’t intentionally erase the data, just layers a working system on top of whatever system was there). With luck, you’ll get a backup and a working system without having to do an erase install or the full restore operation.

  • Thanks for your reply. I've put it in target disk mode and connected it to my iMac, the drive shows up but the same thing happens it fails to mount it. I can't get access to the drive in order to copy any files off it. It says its encrypted when selecting the drive with recovery software and when i use my admin password from the laptop it just says invalid? I've used no other password on the laptop.
    – RSTom
    Mar 6 at 12:29
  • The time where you could get data off that drive may be passed @RSTom how much is it worth? If it’s less than $100 might be time to bite the bullet and erase it if my steps (restore especially) don’t work. You’ve accessed the disk in two ways, the problem is the filesystem structure isn’t consistent enough to mount the containers or volumes inside and apply the decryption keys that the T2 chip must apply to the raw storage bits.
    – bmike
    Mar 6 at 13:01
  • I have session photos from my studio shoots and some other things on there i'd like to keep. I guess I'm going to have to take this as a very hard lesson to back my data up regularly on all my devices. Absolutely gutted but i need to get the macbook up and running to continue using it to work. - Thanks for your help.
    – RSTom
    Mar 6 at 13:29
  • So, so sorry. We should change “death and taxes” to include data loss in this century. I added links on how the data is encrypted, but the overall options you have are delay and cost either way.
    – bmike
    Mar 6 at 13:34

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