A portable collapsible potty has a seat that is supported on two wide hinged legs fitted with lever handles to effect a simple one step deployment of the unit into ready-for-use position. Accordingly, the disc defect management method and apparatus are applicable to a recordable disc such as a write-once disc while effectively using a defect management area of the disc. This determination is made based on the degree of correlation between a signal converted from the input signal and the guard interval period of the signal delayed from the converted signal. in connection with the storage unit being filled with coffee beans, a caffetier is inserted into the fastening mechanism, whereupon the dosage unit automatically registers the size of the caffetier and a pre-programmed amount of coffee is ground directly into the caffetier.