A method comprises creating calibration data using a first control
circuitry of an apparatus, replacing the first control circuitry with a
second control circuitry in the apparatus, and operating the apparatus
with the second control circuitry using the calibration data. As an
example, the apparatus may be a disc drive. The second control circuitry
may be substantially similar to the first control circuitry such that
calibration measurements using the first control circuitry are applicable
to the second control circuitry. The first control circuitry may be
included in a circuit board that is replaced with a second circuit board
including the second control circuitry. In an exemplary embodiment, the
second circuit board may include different and/or additional components
relative to the first circuit board, such as integrated video inputs
and/or video control circuitry.