In a phase-change nonvolatile storage device using a phase-change material as storage cells, which is improved to overcome a basic problem involved in conventional devices of this type and reliably, easily operable as a storage device, the pre-record state of a storage cell is read before recording information in the storage cell, and a write pulse optimum for transition is selected and applied. The method includes steps of associating an allocated uplink resource ) with one or more Temporary Block Flows for a Packet Data Channel, and not with a MS per se ; and using a Temporary Flow Identity for identifying a TBF, where a TFI may be unique to a PDCH and, if not, is unique with respect to the MS on a PDCH. The method includes concurrently slitting and forming transverse rows of elongated, convexly-shaped wire segments deformed out of the plane of the strip with laterally adjacent wire segments extending from opposite sides of the plane of the strip, the lateral rows separated by alternately slit segments retained in the plane of the strip together defining nodes extending laterally across the strip. In some embodiments, a measure of value N indicates that a given property that is being checked will not be violated within a distance N from an initial state from which the analysis started. With such a fuse-bonding state of the microfine long fibers, the grain-finished leather-like sheet combines a low compression resistance and a dense feel each comparable to natural leathers, has a sufficient practical strength, and are excellent in properties which are required according to its use.