| Abstract |
A non-destructive technique to inspect a scratch on all magnetic disks in the beginning
process of hard disk drive (HDD) manufacturing by using CD and DVD pick-up heads as the detector
is proposed. It requires a 100% disk inspection of micrometer-sized scratches in a quick measurement
with low cost inventing. Most of the previous studies were in static state but this is the first time to be
done in dynamic study using the microcontroller in order to promptly serve for industrial utilization.
The size, position, and shape characteristic of scratches are examined using light reflection technique.
The results show that, when the laser beam is targeted on a magnetic disk in a position, either scratch
or non-scratch, the reflected light intensity di ers. The DVD pick-up head can detect the width
and the surface characteristic of the scratches, which is similar to the results from scanning electron
microscope (SEM) for all scratches sizes less than 100 m. It is also found that using a DVD pick-up
head provides a better resolution of shape characteristic and roughness of scratches surface than a
CD pick-up head. Hence, the scratch size of 10s m scale on the magnetic disk can be accurately
characterized by this proposed technique, which can be further utilized for magnetic disk inspection
in the hard disk drive manufacturing process. |
Publication
Journal Publication
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