FileVault 215 Error on Mac: Causes and Quick Fixes

What Does Error 215 Mean

Error 215 occurs when attempting to enable or switch FileVault—the full disk encryption feature in macOS. The system cannot create or configure the boot volume required for encryption. Typically, you see the message: "Failed to turn on FileVault. An error occurred (error 215)." This error blocks encryption activation and often indicates issues with the disk or its settings.

Causes

Error 215 is usually caused by one of the following:

1. Insufficient free space on the system disk—FileVault requires a minimum of 15–20 GB of free space to create a bootable volume.
2. File system or disk corruption—disk-level errors prevent the creation of a boot partition.
3. Permission conflicts or ACL damage—the administrator account or system processes lack sufficient permissions to modify the boot partition.
4. Outdated macOS version or missing updates—known bugs in specific system versions can cause a failure.
5. NVRAM/PRAM issues—incorrect boot settings stored in non-volatile memory.
6. Third-party software conflicts—antivirus tools, disk management utilities, or cleaning programs may interfere with the encryption process.

Solution 1: Check and Free Up Disk Space

The most common cause is lack of free space. FileVault needs room for a temporary boot volume, even if the main disk is nearly full.

1. Open Apple → About This Mac → Storage.
2. Check how much free space is on your system disk (usually "Macintosh HD").
3. If free space is less than 20 GB, free up space:
   • Delete unnecessary files from Downloads, Documents, and Trash.
   • Clear application caches: ~/Library/Caches.
   • Remove old .dmg installers and unused applications.
4. After freeing up at least 20 GB, try enabling FileVault again in System Settings → Privacy & Security → FileVault.

💡 Tip: Use the built-in "Storage" utility to automatically remove unnecessary files, but avoid deleting system data without understanding its purpose.

Solution 2: Run First Aid in Disk Utility

Disk or file system corruption is a common cause of error 215. First Aid will check and fix many issues.

1. Open Applications → Utilities → Disk Utility.
2. In the left column, select your system disk (e.g., "Macintosh HD"), not its volume.
3. Click "First Aid" → "Run".
4. Wait for the check to complete. If Disk Utility finds and fixes errors, try enabling FileVault again.
5. If First Aid cannot repair the disk or reports serious damage, proceed to Solution 4.

⚠️ Important: If Disk Utility suggests creating a new partition, this will erase data. First try other methods or back up your data.

Solution 3: Reset NVRAM/PRAM

Incorrect boot settings in NVRAM can interfere with FileVault. Resetting clears these settings.

For Intel-based Mac:

1. Shut down your Mac.
2. Turn it on and immediately hold Option + Command + P + R.
3. Hold for about 20 seconds (on older Macs, until the startup sound plays).
4. Release the keys. Your Mac will restart.

For Apple Silicon Mac (M1/M2/M3):

1. Shut down your Mac.
2. Hold the power button until startup options appear.
3. Select "Options" → "Reset NVRAM" (if available) or simply restart—NVRAM resets automatically on a clean reboot.

After resetting, try enabling FileVault again.

Solution 4: Restore the Disk from Recovery Mode

If previous methods didn't help, a deeper file system recovery without data loss may be needed.

1. Shut down your Mac.
2. Turn it on and immediately hold:
   • For Intel: Command + R until the Apple logo appears.
   • For Apple Silicon: Hold the power button until startup options appear → select "Options" → "Recovery Mode".
3. In macOS Utilities, select Disk Utility.
4. In the left column, select your system disk (not the volume!), click "First Aid". If Disk Utility offers "Restore", this is a more serious action but does not erase user data unless you format the disk.
5. If First Aid in Recovery Mode doesn't help, you can try "Restore" from a Time Machine backup (if available). This will return the system to a state where FileVault worked.

⚠️ Important: Actions in Recovery Mode are safe for data as long as you do not choose "Erase" or "Partition". Before any action, ensure you have a current backup.

Solution 5: Update macOS

Error 215 may have been fixed in system updates.

1. Open System Settings → Software Update (or "Update & Security" in older versions).
2. Check for updates. Install all available updates, especially minor ones (e.g., 13.6.1 instead of 13.6).
3. After restarting, try enabling FileVault again.

If no update is available and your Mac is on the latest version, try reinstalling macOS without erasing data (via Recovery Mode → "Reinstall macOS"). This updates system files while preserving your data.

Prevention

To avoid error 215 in the future:

• Monitor free space on your system disk. Always keep a buffer of at least 20 GB.
• Regularly update macOS—install all updates, including minor ones.
• Avoid third-party disk management utilities when enabling FileVault. Disable them before activating encryption.
• Periodically run First Aid in Disk Utility (monthly) to maintain disk health.
• Back up your data with Time Machine. This won't prevent error 215, but it will protect your data during any recovery scenario.