A method of manufacturing a patterned data/information storage and
retrieval medium in the form of an annular disk having an outer diameter,
a central opening defining an inner diameter, and opposed first and second
major surfaces, the method including inserting a smaller diameter
cylindrical shaft of a stamping/imprinting tool in the central opening and
biasing the inner diameter of the disk into contact with the cylindrical
shaft at a pre-selected location along the inner diameter of the disk
during stamping/imprinting of a pre-selected pattern such as a servo
pattern in at least one of the first and second major surfaces of the
disk, the biasing creating a space between the inner diameter of the disk
and the surface of the cylindrical shaft which has a maximum width at a
location diametrically opposite the pre-selected location. A disk drive
system is then formed by mounting the patterned medium on a drive spindle
shaft with the medium biased into contact with the shaft at the
pre-selected location along the inner diameter of the medium, whereby
proper centering of the servo pattern is provided.
