lrdi.setPosition(PAGE_HEADER_OFFSET);
long spare;
isOverflowPage = lrdi.readBoolean();
setPageStatus (lrdi.readByte());
setPageVersion (lrdi.readLong());
slotsInUse = lrdi.readUnsignedShort();
nextId = lrdi.readInt();
generation = lrdi.readInt(); // page generation (Future Use)
prevGeneration = lrdi.readInt(); // previous generation (Future Use)