Abstract
Low media price and removability have always been unique selling features of CD and DVD. Nowadays, all kinds of affordable and removable storage media are available that have the additional capacity of high-speed accessing. Whereas the latter emerges from the computer industry, CD and DVD historically stem from the consumer industry where access time has never been a critical factor, since audio and video data are predominantly read sequentially rather than randomly. However, there is an increasing demand of both the consumer and the computer market for fast random-access optical drives, which requires the development of new radial access mechanisms. We have achieved 11 ms average seek time for a 120-mm optical disc by applying a three-phase commuting linear motor in combination with a split-optical head resulting in 25 ms total average access time for a DVD-ROM spinning at 100 Hz (10X).
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