Higher inter-disc separations to improve disc drive actuator servo performance
AssigneeSeagate Technology LLC
InventorsKent Jon Forbord, Brian Robert Pollock, Joshua Ward Christensen
Life of this patent
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Abstract
To alleviate excessive non-repeatable runout (NRRO) on heads between discs, an original multi-disc design is adapted by (a) reducing the number of discs in the stack and (b) configuring the disc drive of the adapted design with a larger nominal inter-disc separation than that of the original design. In one embodiment, the larger separation is maintained by an increased number of disc spacers between each consecutive pair of the discs in the disc stack of the modified design. The result of such a design adaptation is a disc drive with better performance characteristics than would exist by the original design.
Claims30
A modified-design disc drive having N coaxially stacked data storage discs, the modified-design disc drive made by a method comprising steps of:
- (a) constructing a first disc drive so that more than N original-type discs are within a first housing, a successive pair of the original-type discs being separated by a first nominal distance D;
- and
- (b) constructing the modified-design disc drive so that a consecutive pair of the N discs are separated by a second nominal distance D2 greater than D within a second housing substantially similar to the first housing.
A disc drive made by modifying an original disc drive design featuring an original nominal inter-disc separation, the disc drive comprising:
- a coaxial stack including a plurality of discs;
- and
- means for maintaining a separation between consecutive ones of the discs that is larger than the original inter-disc separation.
Dependencies are inferred from the claim text.