Could not mount "Macintosh HD - Data" Error: 49218

After rebooting, and after entering my password, I am presented with the message:

"Your computer restarted because of a problem." It recycles between the login and that message.

Upon running diagnostics, it shows:

Running First Aid on "Macintosh HD - Data"

error: inode_val: object (oid 0x54067ba): invalid length (20)

Extent ref tree is invalid.

The volume /dev/rdisk2s1 could not be verified completely.

File system check exit code is 0.

Restoring the original state found as unmounted.

Mounting unlocked disk

The operation couldn't be completed. (com.apple.DiskManagement.disenter error 49218.)

Operation successful.

OS: Big Sur

MacBook Pro - Model A1502

MacBook Pro 13″, macOS 11.5

Posted on Sep 6, 2021 11:29 AM

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1 reply

Sep 7, 2021 8:50 AM in response to Trev_Frisco

Hi Trev_Frisco,

Welcome to the Apple Support Communities!

We are happy to help with the issue you are having with not being able to start up your MacBook. We see you came from If your Mac doesn't start up all the way. Have you tried any other steps in this resource? To confirm, you are not seeing anything specific on your screen other than your login screen correct? Then it restarts? Have you tried any other steps in this resource?

Let's try these suggestions:

"If Disk Utility can’t repair your disk, or you receive a report that the First Aid process failed, try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data."

Repair a storage device in Disk Utility on Mac

Cheers!

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Could not mount "Macintosh HD - Data" Error: 49218