Abstract: A cartridge module alignment and mounting system, apparatus and method for mounting of a plurality of removable modules where the modules can be densely packed within the apparatus and where physical alignment of the module is maintained during insertion and removal so that the modules are easily connected or disconnected to a printed circuit board. The system includes an alignment pin affixable to the printed circuit board, and a carrier attachable to an electronic device such as a data storage device. The carrier can include a pin bore configured to receive a portion of the alignment pin thereby removably connecting and aligning the electronic device to the printed circuit board so that a space is defined between adjacent electronic devices. The space allows airflow or fluid flow to pass therebetween increasing heat dissipation of the electronic devices and the printed circuit board.

Abstract: A rotating object dynamic balancing system and method for balancing a rotating object including a shaft by using centrifugal force on a plurality of weighted masses traveling along at least one race. The rotating object dynamic balancing system has an inner body, an outer body, a fastening body or fastening body, and a plurality of weighted masses. The inner body has a hollow interior area and an aperture in communication with the interior area and adapted to receive the shaft. The outer body has a hollow interior area defined therethrough, and at least one radial race defined in the interior area. The outer body is attachable to the inner body. The fastening body has a hollow interior area, and is configured to be received into the interior area of the inner body. The interior area of the fastening body assembly is adapted to engage with the shaft received through the inner body thereby securing the rotating object dynamic balancing system to the rotating object.