Article ID: 933246 - View products that this article applies to.
The BitLocker Drive Preparation Tool is available. You can use this tool to prepare the computer for BitLocker Drive Encryption.
This article describes how to obtain this tool. This article also provides an operational overview of the tool. This overview includes system requirements and command-line parameters. Finally, this article describes the most common problems that you may encounter when you use the tool.
How to obtain the BitLocker Drive Preparation Tool
Windows Vista Ultimate and Windows Vista Ultimate Service Pack 1If you are using Windows Vista Ultimate, follow these steps to obtain the tool:
Windows Vista Enterprise and Windows Server 2008 for x86-based Systems(KB933246)If you are using Windows Vista Enterprise or Windows Server 2008 for x86-based Systems, visit the following Microsoft Web site to obtain to tool:
Windows Vista Enterprise and Windows Server 2008 for x64-based Systems (KB933246)If you are using Windows Vista Enterprise or Windows Server 2008 for x64-based Systems, visit the following Microsoft Web site to obtain to tool:
When you install this tool, the tool adds an item to the Start menu. To start the BitLocker Drive Preparation Tool, use one of the following methods:
How to prepare the hard disk for BitLocker Drive EncryptionTo encrypt drives and to verify boot integrity, BitLocker requires at least two partitions. These two partitions make up a split-load configuration. A split-load configuration separates the main operating system partition from the active system partition from which the computer starts.
The BitLocker Drive Preparation Tool automates the following processes to make the computer ready for BitLocker:
System requirementsTo create a new partition or to merge unallocated space with an existing partition, the target system must meet the following requirements:
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Target system configurationsThe BitLocker Drive Preparation Tool supports Windows Vista Ultimate, Windows Vista Enterprise, Windows Vista Ultimate Service Pack 1, Windows Vista Enterprise Service Pack 1, and Windows Server 2008. This tool successfully creates a split-load configuration when the active state, the system state and the boot state are all assigned to the same simple volume.
Default operational procedureWhen the BitLocker Drive Preparation Tool starts, it tries to create a split-load configuration by using the following methods, in order of preference:
Preferred order of operationsThe following chart shows the preferred order of operations that the BitLocker Drive Preparation Tool follows.
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Command-line parametersThe BitLocker Drive Preparation Tool uses a simple set of command-line parameters. These parameters make integration with enterprise deployment tools more flexible. Enterprise deployment tools include Microsoft Systems Management Server (SMS) and Microsoft Business Desktop Deployment (BDD). The parameters also provide customized deployment options. The following table lists the parameters. The parameters are not case-sensitive.
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Example scenario 1The target system has a single partition. To prepare the computer for BitLocker, you want to split the operating system partition. You want the following conditions to be true:
BdeHdCfg.exe -target c: shrink -newdriveletter x: -size 1500 -quiet -restart
Example scenario 2The target system has more than one partition. To prepare the computer for BitLocker, you want to merge unallocated space with an existing partition. You want the following conditions to be true:
BdeHdCfg.exe -target d: merge -quiet -restart
A common problemYou may receive the following error message when you use the BitLocker Drive Preparation Tool:
This error may occur in one of the following scenarios.
The BitLocker Drive Preparation Tool could not find a target system drive. You may need to manually prepare your drive for BitLocker.
Scenario 1: You do not have sufficient free disk spaceAt least 10 percent of the active partition must remain free after the partition size is reduced by 1.5 gigabytes (GB). To resolve this error, move files to another partition or delete files.
Scenario 2: The partition contains files that cannot be movedThe BitLocker Drive Preparation Tool may resize partitions to prepare a hard disk for BitLocker. Occasionally, some unmovable files may prevent the tool from defragmenting and resizing partitions. These files may include any of the following items:
To work around this error, use one of the following methods:
You receive one of the error messages when you run the BitLocker Drive Preparation tool on a Windows Server 2008-based server
When you use the BitLocker Drive Preparation tool on a Windows Server 2008-based server, you may receive one of the following error messages:
The BitLocker Drive Preparation Tool cannot be used in this version of Windows. Upgrade Windows.
Note If you install the BitLocker Drive Preparation Tool from the MSU package, you will see only the first error message in this topic. However, it is possible that you copy the binary files from an earlier release of the BitLocker Drive Preparation Tool. Then, you will see the second error message.
An unexpected error occurred while running the BitLocker Drive Preparation Tool. You may have to manually prepare your drive for BitLocker.
To resolve this issue, install the BitLocker Drive Encryption optional component. To do this, follow these steps that are mentioned in the "System requirements" section.
You receive an error message when you try to enable BitLocker Drive Encryption on an IBM portable computerWhen you try to enable BitLocker Drive Encryption on an IBM portable computer that is running Windows Vista, you may receive the following error message:
To resolve this problem, follow these steps.
Insufficient disk space for BitLocker Drive Encryption to encrypt the drive. Use disk maintenance tools to repair the disk and try again.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756To have us resolve this problem for you, go to the "Fix it for me" section. If you prefer to fix this problem yourself, go to the "Let me fix it myself" section.
(https://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
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Article ID: 933246 - Last Review: December 21, 2011 - Revision: 6.0