Unlike Windows Vista and Windows 7, Windows 8 has the ability to pre-provision the system volume during installation. To use BitLocker Pre-Provisioning, we have three options open to us, MDT 2012, SCCM 2012 SP1, or WinPE 4.0.
NOTE: The WinPE option is a bit more complicated as you must add the file management and startup optional components to your WinPE image. Otherwise you will not have the manage-bde tool available.
Building a Windows PE Image with Optional Components
TPM should be enabled in the BIOS prior to installation
Steps to be done after Windows installation:
The BitLockered volume will be in a “Waiting for Activation” state, as it is using a clear protector. This can be done using either of the following options
The advantage to this approach is that activating protection post installation only takes a few seconds instead of the user having to wait for BitLocker to encrypt the entire volume.