Abstract: Methods and apparatus for generating a hard drive write signal are here in disclosed. A disclosed method comprises generating a hard drive write signal on an output of a switch based on an edge of the first control signal and reducing the hard drive write signal based on an edge of a second control signal via a second switch.

Abstract: Methods and apparatus for temperature compensation for hard disk drive writer overshoot current are disclosed. A disclosed system comprises creating a first delay based on the temperature of the hard disk drive, creating a second delay based on the temperature of the hard disk drive, and creating a pulse based on the first and second delay.

Abstract: Methods and apparatus for controlling the duration of a pulse in a hard drive write system are disclosed. A disclosed method comprises generating a current pulse, reducing the current of the pulse and conveying a portion of the current pulse to a hard drive write system. In addition, a method is disclosed whereby a portion of the current pulse is truncated.

Abstract: A write driver output circuit having a programmable output impedance. A plurality of amplifiers are disposed in parallel between an input and an output of an impedance matching section of the write driver circuit and can be selectively enabled to correspondingly set the output impedance of the write driver circuit. The amplifiers may be Class AB amplifiers, each of which have a smaller size than an conventional AB used in a single amplifier write driver circuit. Each of the Class AB amplifiers has a corresponding matching resistor, and a current source, each being selectively enabled and disabled by enabling and disabling, respectively, the corresponding current sources, such as through the use of serial interface bits.