Embodiments disclosed herein generally relate to a head slider within disk drive data storage devices. The crossline generator comprises a support body pendulously supported and having ear portions and a paddle. In one or more arrangements, the second driving unit is independent from the first driving unit. The control unit selects one of control patterns to actually operate the compressor in accordance with the selected control pattern, so that fuel consuming amount can be reduced. The foldable holder is rotatably connected to the fastening module.