prevGeneration = lrdi.readInt(); // previous generation (Future Use)
bipLocation = lrdi.readLong(); // BIPage location (Future Use)
// number of deleted rows on page, we start to store this release 2.0.
// for upgrade reasons, a 0 on disk means -1, so, we subtract one here.
deletedRowCount = lrdi.readUnsignedShort() - 1;
// the next 4 (total 22 bytes) are reserved for future
spare = lrdi.readUnsignedShort();
spare = lrdi.readInt(); // used by encryption
spare = lrdi.readLong();