According to this: https://superuser.com/a/1398914/38072 https://superuser.com/a/1398914/38072 BitLocker uses TPM to store HDD encryption keys. I suppose you

According to this: https://superuser.com/a/1398914/38072 https://superuser.com/a/1398914/38072 BitLocker uses TPM to store HDD encryption keys. I suppose you need it to resize the partition without deleting your encrypted Windows data, at least.