Method and apparatus for certifying servo sectors on recording surfaces of
a disc stack of a data storage device to promote servo sector alignment
among the various recording surfaces. A reference servo sector pattern is
written to a first recording surface, the reference pattern comprising a
plurality of angularly spaced apart servo sectors. Multiple interleaved
sets of servo sector patterns are written to each of the remaining
recording surfaces, each interleaved pattern respectively comprising a
plurality of angularly spaced apart servo sectors. A selected interleaved
pattern is identified from each of the remaining surfaces that provides a
desired alignment with the reference servo sector pattern, and the
non-selected servo sector patterns are overwritten. The servo patterns
can be written to the discs prior to installation using a multiple disc
writing (MDW) station, or after installation of the discs into the data
storage device using a servo track writing (STW) station.