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FVE_E_VOLUME_EXTEND_PREVENTS_EOW_DECRYPT
BitLocker provides full volume encryption (FVE) for operating system volumes, as well as fixed and removable data drives. To support fully encrypted operating system drives, BitLocker uses an unencrypted system partition for the files required to boot, decrypt, and load the operating system. This volume is automatically created during a new installation of both client and server operating systems.
In the event that the drive was prepared as a single contiguous space, BitLocker requires a new volume to hold the boot files. BdeHdCfg.exe can create these
Encrypting volumes with the BitLocker control panel (select Start, type bitlocker, select Manage BitLocker) is how many users will utilize BitLocker. The name of the BitLocker control panel is BitLocker Drive Encryption. The BitLocker control panel supports encrypting operating system, fixed data, and removable data volumes. The BitLocker control panel will organize available drives in the appropriate category based on how the device reports itself to Windows. Only formatted volumes with assigned drive letters will appear properly in the BitLocker control panel applet. To start encryption for a volume, select Turn on BitLocker for the appropriate drive to initialize the BitLocker Drive Encryption Wizard. BitLocker Drive Encryption Wizard options vary based on volume type (operating system volume or data volume).
Upon launch, the BitLocker Drive Encryption Wizard verifies the computer meets the BitLocker system requirements for encrypting an operating system volume.
Bitlocker
BitLocker Drive Encryption is a data protection feature that integrates with the operating system and addresses the threats of data theft or exposure from lost, stolen, or inappropriately decommissioned computers.
BitLocker provides the most protection when used with a Trusted Platform Module (TPM) version 1.2 or later. The TPM is a hardware component installed in many newer computers by the computer manufacturers. It works with BitLocker to help protect user data and to ensure that a computer has not been tampered with while the system was offline.
On computers that do not have a TPM version 1.2 or later, you can still use BitLocker to encrypt the Windows operating system drive. However, this implementation will require the user to insert a USB startup key to start the computer or resume from hibernation. Starting with Windows 8, you can use an operating system volume password to protect the operating system volume on a computer without TPM. Both options do not provide the pre-startup system integrity verification offered by BitLocker with a TPM.
In addition to the TPM, BitLocker offers the option to lock the normal startup process until the user supplies a personal identification number (PIN) or inserts a removable device, such as a USB flash drive, that contains a startup key. These additional security measures provide multifactor authentication and assurance that the computer will not start or resume from hibernation until the correct PIN or startup key is presented.