Memory devices and methods are described, such as those that include a stack of memory dies and an attached logic die. The bevel has a length that extends perpendicular to the circumference of the roller head. The dye therein stably located can be optically detected by, preferably, light-radiation-stimulated fluorescence. The sense amplifier is coupled to the positive side of the first resistor via a first pin of the sense amplifier, and coupled to the negative side of the first resistor through the second resistor via a second pin of the sense amplifier.