A method of testing a one or more components of a data storage system introduces a first plurality of micro-transitions into a first data write pattern, which is then written to a magnetic media. The rechargeable battery is configured to supply power to the processing device. A code is generated based on the information in the playlist and the generated code is output to the screen. In an embodiment, the device is a member, such as a rectangular box, having staggered top and bottom end walls thus providing an obstacle and maze. The blade is formed from cores in which the trailing edge portion of the blade is formed from a first core member that forms the last leg of the serpentine flow circuit and the impingement cavity of the upper span, and a second core member that forms the lower span cooling circuit. A selector function uses selection criteria to select accounts and events from the relational database in order to generate a number of inputs for profitability calculations.