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Fix an encrypted drive that will not mount

We'll confirm the password, check for recovery keys (BitLocker/FileVault), rule out hardware, and tell you when to escalate.

Troubleshooting · Security basics
10–30 min
What you'll need
  • Password or passphrase used when encrypting
  • Recovery key (BitLocker or FileVault) if you saved it

At a glance

  • Confirm you are using the correct password or passphrase.
  • Check whether the drive needs a recovery key (BitLocker) or recovery password (FileVault).
  • On Windows, confirm BitLocker is not suspended and TPM is working.
  • On Mac, confirm FileVault is enabled and the recovery key is available.
  • If the drive is physically damaged or the key is lost, data recovery may not be possible.
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Steps

Goal: Confirm the password, check for recovery keys, and rule out hardware before escalating.

  • Confirm you are using the correct password or passphrase. Check Caps Lock and keyboard layout.
  • Good: The drive opens. Proceed to use it normally.
  • Bad: The drive still will not open. Proceed to Check for recovery key.

Check password and recovery key

Goal: Use the recovery key when the password does not work (BitLocker or FileVault).

  • Windows (BitLocker): Enter the 48-digit recovery key at the prompt. Find it at account.microsoft.com/devices/recoverykey or in your saved printout.
  • Mac (FileVault): Enter the recovery key you saved when enabling FileVault. Check iCloud at appleid.apple.com if you stored it there.
  • Good: The drive opens with the recovery key.
  • Bad: You do not have the recovery key—data recovery may not be possible.

BitLocker path

Goal: Open a BitLocker drive on Windows.

  • Open Control Panel > BitLocker Drive Encryption. Confirm the drive is not suspended.
  • Select the drive and enter the password (or use the open option in the BitLocker UI). If prompted for a recovery key, enter the 48-digit key.
  • Good: The drive opens and appears in File Explorer.
  • Bad: Wrong password or missing recovery key—try the steps above. If the drive is not detected, see Confirm drive detection.

FileVault path

Goal: Open a FileVault drive on Mac.

  • Open System Settings > Privacy & Security > FileVault. Confirm FileVault is on.
  • If the Mac will not boot, boot to Recovery (hold Command+R), open Disk Utility, select the volume, and use the option to open the volume. Enter the password or recovery key.
  • Good: The volume mounts and is accessible.
  • Bad: Wrong password or missing recovery key. If the drive is not detected, see Confirm drive detection.

Confirm drive detection

Goal: Rule out hardware before assuming an encryption problem.

  • Windows: Open Disk Management (diskmgmt.msc). Look for the drive—it may show as “Unknown” or “Not Initialized” if locked.
  • Mac: Open Disk Utility. Look for the drive in the sidebar.
  • Good: The drive appears. The issue is password or recovery key.
  • Bad: The drive does not appear. Try another USB port, cable, or computer. If it never appears, the drive or connection may be faulty.

When to get help

If you have the correct password and recovery key but the drive still will not mount, or the drive is not detected at all, contact a data recovery specialist. Do not run chkdsk, fsck, or other repair tools on an encrypted drive—they can make recovery harder.

Verification

  • The encrypted drive opens and appears in File Explorer (Windows) or Finder (Mac).
  • You can read and write files to the drive.
  • No error messages when accessing the drive.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm password Enter the correct password; check for typos and Caps Lock.
  2. Recovery key Use BitLocker or FileVault recovery key if prompted.
  3. Drive detection Confirm the drive appears in Disk Management or Disk Utility.
  4. Try another computer Test the drive on another machine to isolate the issue.
  5. Escalate Data recovery specialist if password and key are correct but drive will not mount.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Operating system and encryption type (BitLocker, FileVault, LUKS, VeraCrypt)
  • Exact error message when decrypt fails
  • Whether the drive is detected in Disk Management or Disk Utility
  • Steps already tried

Reviewed by Blackbox Atlas

Frequently asked questions

Why would an encrypted drive not mount?
Wrong password, TPM or recovery key required, drive corruption, or hardware failure. BitLocker may need a recovery key if the TPM changed. FileVault needs the recovery key if the password does not work.
Can I recover data from an encrypted drive without the password?
No. Encryption is designed to prevent access without the key. If you have lost the password and recovery key, the data is typically unrecoverable.
When should I escalate encrypted drive issues?
If you have the correct password and recovery key but the drive still will not mount, or if the drive makes unusual noises or is not detected at all.

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