A method and system for adaptively limiting an off-track recovery displacement of a recording head during an off-track data recovery operation. The flanges provide a layered tapered appearance that allow for less mud to be used and fewer mud applications required for installing the corner. In a method aspect of the present invention, an erectile dysfunction drug is delivered to a patient through an inhalation route. The transistor groups 12, 13, 16, 17 comprise one or a plurality of transistors that are turned ON or OFF by respective control signals BN1 to BN4, BN5 to BN8, BP1 to BP4 and BP5 to BP8. The first processing unit requests approval from the third processing unit via the control channel to transmit a data communication to the second processing unit, and the third processing unit approves or delays transmission of the data communication in a response transmitted via the control channel.