BitLocker and unallocated space

I often see two questions related to free (a.k.a. “unallocated”) disk space when people talk about Windows BitLocker™ Drive Encryption on various forums: Q: What happens to unallocated space when I enable BitLocker on my volume? Does it get encrypted? Q: I enabled BitLocker on my volume and – poof! – all my free space…


Bulat Shelepov

Bulat Shelepov is a Software Development Engineer with the System Integrity team at Microsoft.