In a nonvolatile memory, the threshold is restored to a state before changing, without increasing number of writing undesirably. The invention also discloses a method of manufacturing the PZT element, a HGA and disk drive unit with the same. Structural support is provided to this tube, including a concentric outer tube, and frusto-conical supporting web. When the network node receives the programmable packet, the node determines a reputation value for the name prefix at the local node, and compares this reputation value to the packet’s reputation criteria.