macOS FileVault Error — Encryption Failed or Stuck Fix

What Does This Error Mean?

FileVault is macOS's built-in full-disk encryption. FileVault errors can appear during the initial encryption process, after an interrupted encryption, or when the system cannot unlock the drive at startup. Common symptoms include FileVault being stuck encrypting for days, a message that encryption could not be completed, or the Mac asking repeatedly for your FileVault recovery key at startup.

Affected Models

MacBook Air
MacBook Pro
iMac
Mac Mini
Mac Pro
Mac Studio

Common Causes

The initial encryption process was interrupted by a power loss or forced shutdown
There is not enough free disk space to complete the encryption conversion
Disk errors on the drive are preventing the encryption process from proceeding
The FileVault recovery key was lost and the Mac is asking for it at every startup
A macOS software bug is causing FileVault to report incorrect progress or errors

How to Fix It

Check current FileVault status. Open Terminal (Applications > Utilities > Terminal) and type: fdesetup status — this shows whether encryption is in progress, complete, or paused.

Knowing the exact status helps determine which fix is appropriate. 'Encryption in progress' is normal and may just need more time.
If encryption is paused, restart and keep the Mac plugged in. FileVault encryption pauses when the Mac is unplugged or when the lid is closed. Connect the power adapter and leave the Mac running and awake.

FileVault encryption can take many hours for large drives. A 1 TB drive may take 8–24 hours to fully encrypt. Do not interrupt it.
Check for disk errors before resuming. Open Disk Utility (Applications > Utilities > Disk Utility), select your internal drive, and click First Aid. Fix any errors before continuing with FileVault.

Disk errors can cause FileVault to fail or stall. Always check drive health before troubleshooting FileVault software issues.
If FileVault is stuck and will not progress, turn it off and re-enable it. Go to System Settings > Privacy and Security > FileVault and click Turn Off FileVault. Once the decryption completes, turn it on again.

Decryption takes as long as encryption. Only do this if the encryption has been genuinely stuck (no progress) for more than 24 hours.
Locate or reset your FileVault recovery key. If the Mac is asking for a recovery key at startup, retrieve it from Apple (if you stored it with iCloud) at iforgot.apple.com or from wherever you saved it when FileVault was first turned on.

The recovery key is a long alphanumeric code shown once when FileVault was enabled. If it is completely lost and no Apple ID reset is available, the drive cannot be unlocked.

When to Call a Professional

If FileVault is stuck and the drive shows disk errors, do not attempt to force-restart repeatedly — this can worsen drive problems. A technician can diagnose whether the issue is a software bug or a failing drive. If the drive is failing, data recovery should be attempted before any other action.

Frequently Asked Questions

How long does FileVault take to encrypt a drive?

The time depends on drive size and Mac model. A 256 GB drive typically takes 1–6 hours. A 1 TB or larger drive can take 8–24 hours or more. The Mac remains fully usable during encryption — you do not need to wait for it to complete before using your Mac. Encryption runs in the background when the Mac is plugged in and awake.

Do I really need FileVault?

It depends on how you use your Mac. If your Mac contains sensitive personal, financial, or business information, FileVault ensures that even if your Mac is lost or stolen, no one can access your data by removing the drive. For most laptop users, especially those who travel, FileVault is strongly recommended. For a home desktop Mac that never leaves the house, it is optional but still a good security practice.

Will FileVault slow down my Mac?

On modern Macs with Apple Silicon or Intel Macs with a T1/T2 security chip, FileVault encryption and decryption happen in hardware and have no noticeable performance impact. On very old Macs without a dedicated security chip, you may notice a slight reduction in storage read/write speed. For most users on any Mac from 2018 or newer, the performance impact is essentially zero.