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To lock a BitLocker-protected data drive in Windows 11, open Command Prompt and run manage-bde -lock D:, replacing D: with the drive letter you want to lock. You can also use PowerShell with Lock-BitLocker -MountPoint "E:". Save or know the appropriate unlock method before locking the drive.

Lock a BitLocker drive from Command Prompt

  1. Open Command Prompt. Use an account with permission to manage the drive.
  2. Enter manage-bde -lock D:, replacing D: with the target drive letter, then press Enter. Microsoft documents this syntax and example for Windows 11 in its manage-bde lock reference.

The command locks a BitLocker-protected drive so its contents cannot be accessed until an unlock key is provided. Confirm the drive letter before running it; the example letter is not necessarily your drive.

Lock a drive from PowerShell

  1. Open PowerShell.
  2. Run Lock-BitLocker -MountPoint "E:", changing E: to the target volume’s mount point. Microsoft documents this form in its Lock-BitLocker reference.

The Lock-BitLocker cmdlet cannot lock the volume hosting the operating system, so it is not a way to lock the currently running Windows volume, typically C:. Microsoft’s BitLocker operations guide identifies Command Prompt and PowerShell tools as options for managing BitLocker, including scripted tasks.

If the drive is in use

PowerShell provides the -ForceDismount option to attempt to lock a volume even when it is in use:

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Lock-BitLocker -MountPoint "E:" -ForceDismount

Use this only when necessary. Forcing a dismount can interrupt access to the active volume or files using it; close applications and finish file operations first when possible. The option is documented in Microsoft’s Lock-BitLocker reference.

Choose between the two commands

Method Command Useful when Limit or consideration
Command Prompt manage-bde -lock D: You want a direct command for a data drive. Substitute the correct drive letter. See Microsoft’s command reference.
PowerShell Lock-BitLocker -MountPoint "E:" You prefer PowerShell or are incorporating the action into a script. Cannot lock the operating-system volume. See Microsoft’s cmdlet reference.

Microsoft also describes Control Panel as a management path for basic BitLocker tasks, but the cited guidance does not specify a Control Panel procedure for locking a drive. For the lock action, use one of the documented commands above.

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Unlock the drive when you need it again

Locking is separate from turning BitLocker off, suspending protection, or changing a key protector. To regain access, unlock the drive using an available unlock method. Microsoft documents manage-bde -unlock with either a recovery password or a recovery-key file in its manage-bde unlock reference. Make sure you can access the method appropriate to your drive before locking it.

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Automatic unlocking is a separate setting

Automatic unlocking for BitLocker-protected data drives is configured independently of the lock command. Microsoft documents manage-bde -autounlock -disable D: to disable automatic unlocking and manage-bde -autounlock -enable D: to enable it. These commands change the automatic-unlock setting; they are not substitutes for locking the drive. See Microsoft’s manage-bde autounlock reference.

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