The BitLocker Drive Preparation Tool configures the hard disk drives in your computer properly to support enabling BitLocker.
Windows BitLocker Drive Encryption is a feature that encrypts one or more volumes (drives) attached to your computer and that can use a Trusted Platform Module (TPM) to verify the integrity of early startup components. Because BitLocker encrypts the entire volume of data, it requires the computer to be configured with an active partition, used for startup, which is separate from the operating system volume. This is called a “split-load configuration.” User data is stored on either the operating system volume or additional data volumes, which can also be encrypted by using BitLocker.
The BitLocker Drive Preparation Tool automates the following processes to configure the hard disk drive correctly:
1. It creates a second volume, if one is not already present.
2. It moves the boot files to the correct volume, and ensures that the operating system is correctly configured to find them at startup.
3. It configures the correct volume as the active partition on the drive for startup.
When the tool finishes, you must restart the computer. The computer’s hard disk drive will then be configured correctly for BitLocker.
Note: In addition to having its hard disk drives configured correctly, your computer must meet specific hardware requirements to enable BitLocker, and you may need to initialize or configure the TPM before BitLocker can be enabled.
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