• File Path: C:\WINDOWS\system32\BdeHdCfg.exe
  • Description: BitLocker Drive Encryption: Drive Preparation Tool


Type Hash
MD5 49993078062CFCCFE5EE1ACCF47B1EAF
SHA1 34597C2BF5FA0BD247C74195B4D5A06FFD8BC461
SHA256 B513A5CFF54702917DE47ADC85E717BAD75ADA41967253A55FB928365DF2E020
SHA384 06CA05C82F119FC12922D0B20F9F02F2D9CD1218472D1C8790427F8EAC5AD0A940EB79440289D4BC595BF740E31B73D2
SHA512 AA832DF6A6EC05C915EF5798B7577F5FF0968C4A2449D9019ABFF2FA64B61E502CFEBAAFE05D523CF5882E2C780BAB21DC331083BB15852ABD3D0D440157CC5E
SSDEEP 3072:qVSiRmzT/b1a+PKHVZzwnVS570M9kdatGCO+xmBc+hMPhPsx:q8x3KHVZ8Vs7nyatGt+SYF

Runtime Data

Usage (stdout):

BitLocker Drive Preparation Tool version 10.0.18362
Copyright (C) 2013 Microsoft Corporation. All rights reserved.


               [-target {default | unallocated | 
                         TargetDriveLetter {shrink | merge} }]
               [-newdriveletter DriveLetter]
               [-size SizeInMegabytes]
               [-quiet] [-restart] [{-? | /?}]

  This command prepares your hard drive for BitLocker Drive Encryption.

  Command line parameters are not case-sensitive.

        Displays information about valid target drives.

        Specifies the target and operation.

        Specify 'shrink' to create a new active partition.
        Specify 'merge' to make an existing partition active.
        Specify 'unallocated' to use unformatted space on disk.
        Specify 'default' for the target to be chosen automatically.

        Examples: -target D: merge
                  -target C: shrink
                  -target unallocated
                  -target default

        Specifies the desired drive letter for the new drive. This option is
        only valid when a new drive is created.

        Example: -newdriveletter S:

        Specifies the desired size of the new drive. This option is only valid
        when a new drive is created.

        If not specified, the Drive Preparation Tool assumes the required
        minimum size of 550 megabytes.

        Example: -size 700
        Specifies operation in quiet mode. No output from the drive preparation
        tool is displayed.

        Enables an automatic restart after drive preparation.

        You must restart your computer before enabling BitLocker.

  -? or /?
        Displays help for this command.

    BdeHdCfg -target c: shrink -newdriveletter x: -size 550 -quiet -restart
    BdeHdCfg -target d: merge -quiet -restart
    BdeHdCfg -target unallocated -newdriveletter s:
    BdeHdCfg -target default


  • Status: Signature verified.
  • Serial: 330000023241FB59996DCC4DFF000000000232
  • Thumbprint: FF82BC38E1DA5E596DF374C53E3617F7EDA36B06
  • Issuer: CN=Microsoft Windows Production PCA 2011, O=Microsoft Corporation, L=Redmond, S=Washington, C=US
  • Subject: CN=Microsoft Windows, O=Microsoft Corporation, L=Redmond, S=Washington, C=US

File Metadata

  • Original Filename: BdeHdCfg.exe.mui
  • Product Name: Microsoft Windows Operating System
  • Company Name: Microsoft Corporation
  • File Version: 10.0.18362.1 (WinBuild.160101.0800)
  • Product Version: 10.0.18362.1
  • Language: English (United States)
  • Legal Copyright: Microsoft Corporation. All rights reserved.

File Similarity (ssdeep match)

File Score
C:\Windows\system32\baaupdate.exe 72
C:\WINDOWS\system32\baaupdate.exe 74
C:\windows\system32\baaupdate.exe 71
C:\Windows\system32\baaupdate.exe 72
C:\Windows\system32\BdeHdCfg.exe 82
C:\Windows\system32\BdeHdCfg.exe 88
C:\windows\system32\BdeHdCfg.exe 72
C:\Windows\system32\bdeunlock.exe 44
C:\Windows\system32\bdeunlock.exe 46
C:\WINDOWS\system32\bdeunlock.exe 41
C:\windows\system32\bdeunlock.exe 50
C:\Windows\system32\BitLockerWizard.exe 77
C:\windows\system32\BitLockerWizard.exe 77
C:\WINDOWS\system32\BitLockerWizard.exe 75
C:\Windows\system32\BitLockerWizard.exe 74
C:\Windows\system32\BitLockerWizardElev.exe 74
C:\Windows\system32\BitLockerWizardElev.exe 74
C:\WINDOWS\system32\BitLockerWizardElev.exe 72
C:\windows\system32\BitLockerWizardElev.exe 75
C:\Windows\system32\fvecpl.dll 43
C:\Windows\system32\fvenotify.exe 66
C:\windows\system32\fvenotify.exe 66
C:\WINDOWS\system32\fvenotify.exe 63
C:\Windows\system32\fvenotify.exe 65
C:\WINDOWS\system32\fveprompt.exe 68
C:\Windows\system32\fveprompt.exe 66
C:\Windows\system32\fveprompt.exe 61
C:\windows\system32\fveprompt.exe 63
C:\Windows\system32\fveui.dll 44
C:\WINDOWS\system32\manage-bde.exe 54
C:\Windows\system32\manage-bde.exe 49
C:\Windows\system32\manage-bde.exe 47
C:\windows\system32\manage-bde.exe 55
C:\Windows\system32\repair-bde.exe 71
C:\WINDOWS\system32\repair-bde.exe 69
C:\windows\system32\repair-bde.exe 69
C:\Windows\system32\repair-bde.exe 66

Additional Info*

*The information below is copied from MicrosoftDocs, which is maintained by Microsoft. Available under CC BY 4.0 license.


Prepares a hard drive with the partitions necessary for BitLocker Drive Encryption. Most installations of Windows 7 will not need to use this tool because BitLocker setup includes the ability to prepare and repartition drives as required.

[!WARNING] There is a known conflict with the Deny write access to fixed drives not protected by BitLocker Group Policy setting located in Computer Configuration\Administrative Templates\Windows Components\BitLocker Drive Encryption\Fixed Data Drives.

If bdehdcfg is run on a computer when this policy setting is enabled, you may encounter the following issues:

  • If you attempted to shrink the drive and create the system drive, the drive size will be successfully reduced and a raw partition will be created. However, the raw partition will not be formatted. The following error message is displayed: The new active Drive cannot be formatted. You may need to manually prepare your drive for BitLocker.

  • If you attempted to use unallocated space to create the system drive, a raw partition will be created. However, the raw partition will not be formatted. The following error message is displayed: The new active Drive cannot be formatted. You may need to manually prepare your drive for BitLocker.

  • If you attempted to merge an existing drive into the system drive, the tool will fail to copy the required boot file onto the target drive to create the system drive. The following error message is displayed: BitLocker setup failed to copy boot files. You may need to manually prepare your drive for BitLocker.

  • If this policy setting is being enforced, a hard drive cannot be repartitioned because the drive is protected. If you are upgrading computers in your organization from a previous version of Windows and those computers were configured with a single partition, you should create the required BitLocker system partition before applying the policy setting to the computers.


bdehdcfg [–driveinfo <drive_letter>] [-target {default|unallocated|<drive_letter> shrink|<drive_letter> merge}] [–newdriveletter] [–size <size_in_mb>] [-quiet]
Parameter Description
bdehdcfg: driveinfo Displays the drive letter, the total size, the maximum free space, and the partition characteristics of the partitions on the drive specified. Only valid partitions are listed. Unallocated space is not listed if four primary or extended partitions already exist.
bdehdcfg: target Defines which portion of a drive to use as the system drive and makes the portion active.
bdehdcfg: newdriveletter Assigns a new drive letter to the portion of a drive used as the system drive.
bdehdcfg: size Determines the size of the system partition when a new system drive is being created.
bdehdcfg: quiet Prevents the display of all actions and errors in the command-line interface and directs bdehdcfg to use the Yes answer to any Yes/No prompts that may occur during subsequent drive preparation.
bdehdcfg: restart Directs the computer to restart after the drive preparation has finished.
/? Displays Help at the command prompt.

Additional References

MIT License. Copyright (c) 2020-2021 Strontic.