The invention relates to methods of assessing one or more geometric properties of a particle of a substance using an infrared spectroscopic property of the substance. At least one engine controller is operatively connected to the printing engine, the engine controller uses software to control operations of the printing engine. A capacity detection step is carried out for detecting a nominal capacity of the optical disk, which indicates a rated volume of information to be recorded at maximum. A properly functioning vapor recovery system recovers approximately one unit volume of vapor for every unit volume of dispensed liquid fuel. The mounting assembly also holds the blade in a third, freely rotating state in which the blade may substantially freely rotate around its blade rotation axis to enable balancing of the blade after sharpening. Snoop logic performs the comparison of the FINE HIT bits with the respective lower order bits of the physical address to determine if a self modifying code condition has occurred within the portion of memory that may be stored in the cache.