"Disk Macintosh HD cannot be unlocked" error after macOS system is updated? This article will guide you through this problem.

This error is usually caused by:

• Macintosh HD - Data Volume Lock: This volume stores your files (pictures, documents, videos, audio, etc.) and should have read and write permissions.
• Redundant disks exist on Mac systems: The system may contain excess disk footprint.

The following steps will help you resolve the "Macintosh HD cannot be unlocked" error:

Use the First Aid feature of Disk Utility

This feature fixes disk errors:

1. Use Spotlight search to open Disk Utility.
2. Click "Show" > "Show All Devices" in the menu bar.
3. Select your hard drive and click "First Aid" > "Run".

"First Aid" can usually fix issues such as disk permissions. Repeat this step for all volumes and restart your Mac.

Expert tip: Before running First Aid, it is recommended to start your Mac in recovery mode to repair internal storage.

Recovery mode startup steps (selected according to your Mac model):

1. Determine whether your Mac is an Intel chip or an M1 chip.
2. Intel chip Mac: Turn off, press and hold the Command R key until it starts.
3. M1 chip Mac: Turn off, press and hold the power button, select "Options", and then click "Continue".

Back up data using Time Machine

If First Aid is invalid, please use Time Machine to back up the data first to prevent data loss:

1. Click Apple menu > System Settings > Time Machine.
2. Click "Select Backup Disk", select the backup drive, and then click "Use Disk".

Use Disk Utility to delete redundant volumes

Delete the excess volume:

1. Open Disk Utility in Spotlight.
2. Select the unwanted volume and click "Erase" (may require a password).

Remember to start your Mac in recovery mode.

Use Smart Uninstaller for MacKeeper to safely delete files

Finally, you can use Smart Uninstaller for MacKeeper to safely delete applications and files that may cause your Mac to run slow:

1. Download MacKeeper on Mac.
2. Select Smart Uninstaller in the menu on the left and click Remove Selected.

This method won't solve the problem directly, but it's safer than manual deletion to avoid data loss.

Unlock Macintosh HD Disk

Solving Macintosh HD problems is not difficult. Through the above steps, you can unlock Macintosh HD disks and use MacKeeper's Smart Uninstaller to improve Mac performance.

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