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The single pulse read back from an isolated magnetization transition in a digital magnetic recording system represents one of the most significant and revealing characterizations of the system's resolution and signal response. Whereas it lacks information on recording demagnetization and interaction demagnetization - two phenomena which are particularly critical at high bit packing densities - it does contain much information on self-demagnetization, spacing losses, and transducer and circuit losses. Much of the missing information on interaction effects can be obtained from the waveform of two closely packed transitions. In this paper we studied both the isolated pulse and the two pulse response of many different disk systems and compared the results to predictions from various theoretical models. The best agreement in both amplitude and spatial distribution is obtained by the Dynamic Iterative Model.