A flash translation layer map stored in the non-volatile portion of a solid-state drive is updated when a firmware flag indicates the contents of this FTL map are not consistent with the contents of an FTL map stored in a volatile memory device of the SSD. A compound is subjected to esterification reaction with a compound to obtain a compound, which is subjected to fluorination in a liquid phase to obtain a compound, which is then subjected to hydrolysis or alcoholysis to obtain a compound, which is then reacted with a compound thereby to obtain a compound. The brick may further include a notch with an insert disposed therein. A first wall extends upwardly from the base and a second wall extends downwardly from the hood. The method includes the steps of measuring a signal level from the signal source along an arc within the beamwidth of the antenna, determining a rate of change of the measured signal level along the arc and solving for a position on the arc where the determined rate of change of the signal level substantially equals zero.