In a nonvolatile memory with block management system, data are written to blocks and are erasable block by block. The radial protrusions are overmolded thermoplastic that distends the sheath radially to the internal diameter of gun barrel. At or near the tightened condition of the assembly, the second element is locked onto the second end-piece so that rotation of the nut is possible only if the torque applied exceeds a given threshold, for which the face teeth jump over each other while the spring is alternately stressed. at any instant in time individual current sourcessinks are either: 1. To form images at a high throughput, a CPU analyzes print data received by a host IF, and a band development schedule when an image to be formed on the basis of image data that is formed on a band unit basis is formed onto a recording medium through an intermediate transfer member is optimized on the basis of the development processing time which is previously predicted.