super.startElement(new LogicalSectorElement("BR"));
LayoutHelper helper = new ElToritoLayoutHelper(this);
BootRecord br = new BootRecord(this, helper);
br.setMetadata(config);
br.doBR();
// Remember Boot System Use (absolute pointer to first sector of Boot Catalog)
bootCatalogLocation = fixup(new LSBFWordDataReference(0));
super.endElement();