Symantec Drive Encryption's BootGuard screen is where a user can authenticates an encrypted drive. If a passphrase is not allowing authentication to the BootGuard screen, a Whole Disk Recovery Token can be used to authenticate.
There are two different styles of the BootGuard screen users may see upon rebooting an encrypted system, MBR or Legacy, and UEFI. These two different styles of BootGuard depend upon how the Operating System boots up. A system using Legacy boot mode, differs from a system using UEFI with how a Whole Disk Recovery Token is used at BootGuard. The difference between these, as well as some considerations for how Whole Disk Recovery tokens can be used, are listed below with screenshots of the two different BootGuard screens: