A reader reads identifiers from tags on pallets conveyed past the reader. A linkage mechanism of the positioner can comprise parallelogram linkages to constrain the rotational motion of the platform. Electrodes, an upper shield film, a lower shield and a lower pole that are formed in-between are metallic thin films of high thermal conductivity, and accordingly have little influence. Early, prompt and late correlation results are determined by correlating the received code signal with early, prompt and late duplicates of the received code signal. The data processing circuitry configured may measure a fullness of the output buffer and may set an operating frequency of the storage, the decoder, the output buffer, or the data processing circuitry, or a combination thereof, depending on a format of the compressed media data and the fullness of the output buffer. Following a successful test, test software and networking software are removed from the computer system before the operating system of the computer system is resealed and the computer system is shipped to the customer.