public function getDefaultDataByteLength() {
        $default = -1;
        $length = $default;
        switch( $this->storage_type ) {
            case StorageType::NOBYTES:
                $length = 0;
                break;
            case StorageType::BYTE:
                $length = 1;
                break;
            case StorageType::WORD:
                $length = 2;
                break;
            case StorageType::DWORD:
                $length = 4;
                break;
            case StorageType::QWORD:
                $length = 8;
                break;
        }
        return $length;
    }