Method of marking and detecting disc index
AssigneeSeagate Technology LLC
InventorsMichael William Pfeiffer, James John Stirn, Richard Gordon Goodrich
Life of this patent
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Abstract
The present invention allows placement of a disc at an angular orientation by marking the disc with an index mark or feature that can be detected, such as by a disc stacking machine used in a servo track writer. Either index is used to rotate the disc to the angular position. The present invention includes marking a disc surface with a mark or feature. An apparatus, such a stacking machine, will read the mark or feature to orient the disc in an angular position. The stacking machine will stack the positioned discs for servo track writing.
Claims13
A method for stacking two discs into a stacked disc array comprising:
- obtaining each disc comprising an index mark adaptively indicating a rotational position of the respective disc;
- orienting each disc in relation to the respective index mark in a disc stacking machine;
- writing servo information to each of the discs;
- removing the discs from the disc stacking machine;
- and
- reorienting each disc in relation to the respective index mark to define a preselected offset in the servo information between the discs while stacking the discs to form the stacked disc array.
Dependencies are inferred from the claim text.