A head gimbal assembly having a stage fixed to a head-slider. The method is characterized in that the process gas expands in a gasification space in the gasification reactor. Both verification tests take place without interrupting operation on the network. The extrication board is slipped behind the driver and the straps secure the extrication board to the back of the driver while seated. In some embodiments, the rotatable tube converts kinetic energy in a fluid into rotating mechanical energy, or converts rotating mechanical energy into kinetic energy in a fluid. The chip includes an active surface and a back surface opposite to the active surface.