The specification discloses a controller housing that utilizes card guides that may be installed and removed without the use of tools. The operation unit is operated when a target function is selected from plural different functions relating to radiographic image capturing. A flexible circuit board assembly can be used to externally electrically interface the converter. The second device can capture an image of the barcode generated on a display of the first device, and use information extracted from that image to attempt to obtain a copy of the e-book. The parity portion is updated based, at least in part, upon the one or more filler portions, thus defining an updated data stripe that includes an updated parity portion. Finally a garbage collector with knowledge of the software transactional memory system compacts software transactional memory logs during garbage collection.