| 摘要 |
FLUID DYNAMIC BEARING MOTOR FOR USE WITH A RANGE OF ROTATIONAL SPEED RATED DISC DRIVE MEMORY DEVICE PRODUCTSA fluid dynamic bearing motor and method are provided for use with various discdrive memory device products differently rated by operational rotational speed. The operational speeds are those speeds measured during reading and writing memory10 operations to the memory device. In an aspect, the present invention meets full operating requirements, including stiffness and power requirements, at multiple rated speeds for use with either standard or high-end performance disc drive products. Costs associated with a dedicated manufacturing line for high-end products are substantially reduced. A singlemanufacturing line can serve both standard and high-end disc drive memory device 15 products. The present invention is especially useful in reducing costs of 2.5 inch notebook products that are typically marketed in two levels of performance, namely, 5400 RPM standard performance products and 7200 RPM high performance products.20 FIGURE 2 |
