According to one embodiment of the present invention, a method of tuning a
Power-On-Reset (POR) register in a data storage device comprises
determining a tuned value for the POR register using feedback from the
data storage device obtained during a certification process of the data
storage device and storing a list in one or more system sectors of the
data storage device, the list comprising an address of the POR register
to be patched and the tuned value. According to another embodiment of the
present invention, a disc drive comprises a rotatable disc, a
microprocessor, and a memory. The memory has a start-up routine that,
when executed by the microprocessor, causes the microprocessor to patch a
Power-On-Reset (POR) register using a tuned values stored in one or more
system sectors of the rotatable disc.