Which factors do magnetic storage device manufacturers balance to ensure high capacity and performance at reasonable cost and reliability?
The primary balance is between coercivity of the media coating and the areal density because increasing areal density increases volatility thus reducing reliability. Manufacturers also balance spin rate with device life. Faster spin rates reduce rotational delay and thus improve performance. But they also cause mechanical components such as bearings to wear/fail more quickly. Both "balancing acts" can be shifted in favor of greater performance/lifetime by using more expensive components such as better bearings and higher coercivity coatings though doing so increases cost – yet another aspect of the manufacturer's balancing act.
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