![]() A tool called the "BitLocker Drive Preparation Tool" is also available from Microsoft that allows an existing volume on Windows Vista to be shrunk to make room for a new boot volume, and for the necessary bootstrapping files to be transferred to it Windows 7 creates the secondary boot volume by default, even if BitLocker is not used initially. Unlike previous versions of Windows, Vista's "diskpart" command-line tool includes the ability to shrink the size of an NTFS volume so that the system volume for BitLocker may be created from already-allocated space. BitLocker requires the boot volume to remain unencrypted-on Windows Vista this volume must be assigned a drive letter, while on Windows 7 that is not required. In order for BitLocker to operate, the hard disk requires at least two NTFS-formatted volumes: one for the operating system (usually C:) and another with a minimum size of 100 MB from which the operating system boots. BIOS, boot sector, etc.), in order to prevent most offline physical attacks, boot sector malware, etc. Also, when disabled, TPM and BitLocker cannot ensure the integrity of the trusted boot path (e.g. A volume may or may not be an entire drive, and cannot span one or more physical drives. Like its official name, BitLocker Drive Encryption is a logical volume encryption system. The following combinations of the above authentication mechanisms are supported, all with an optional escrow recovery key:
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