Low-profile spindle motor whose entire shaft length is utilized to configure, along an encompassing sleeve, a radial dynamic-pressure bearing section. The cooling unit includes supply air and return air temperature sensors which measure the temperature of the air entering and exiting the food cart. Controller may encapsulate the packet to generate an encapsulated packet including an outer header that includes the selected controller IP address. Preferably, the computer can be brought to the same fix level or product level, if desired, as the preferred software inventory through this process. A substrate comprises a first section that intersects at an angle a second section. The locking assemblies each have an actuator at a rear of the tray that is actuated by an installer to lock and unlock the latch with the mounting block.