I went through some blogs for the use of Bitlocker a second partition is required and the BCD store must be moved into that new partition.
Microsoft included a handy command line tool called BdeHdCfg.exe that allows you to create the Bitlocker partition and move the BCD store. The following command shrinks the system partition, creates the new second 300 MB partition, assigns the drive letter S to it and moves the BCD store.
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