Patent ID: 7595949

Claim:
A method for preventing electrical overstress from interfering with a magnetic read-write device, the method comprising: identifying one or more characteristic functions of the device that characterize electrical overstress; generating a wave form representative of the electrical overstress by using the one or more characteristic functions; and enabling the generated wave form to be combined with a read signal to counteract the electrical overstress, wherein the generated wave form is a combination of a common mode component and a differential mode component, each of the common mode and differential mode components operated on separately, wherein the identifying and generating steps are implemented in two parts, a first part receiving a write signal representative of capacitive coupling in the device used to generate the differential mode component of the generated wave form, and a second part receiving a write signal representative of inductive coupling in the device used to generate the common mode component of the generated wave form, each of the first and second parts including a gain adjusting step to adjust an amplitude level of the write signal, a phase adjusting step to change a phase of the write signal by a fixed amount and a filtering step to filter excessive signals from the write signal.