This function used to encrypt whole disk
PRL_RESULT PrlDisk_Encrypt( const PRL_HANDLE Handle, PRL_GUID_PTR Engine, PRL_UINT8_PTR Key, PRL_UINT32 Length, const PRL_DISK_CALLBACK pDiskCallback, PRL_VOID_PTR pParameter );
PrlDisk.h
PRL_RESULT error code.