Preparing the TPM for BitLocker Pre-provisioning using ConfigMgr
There are some definite advantages to pre-provisioning BitLocker. Pre-provisioning the disk will encrypt only used space, so when this step executes, the drive will be encrypted before the operating system has been laid down to the client, saving a ton of time.
The catch here is that in order for pre-provisioning to work, a TPM has to be present on the system AND enabled, as stated in the Pre-provision BitLocker step.