Abstract
This paper describes our two newly developed high-density recording systems, which consist of a 35 GB system and a 20 GB system using partial response maximum likelihood (PRML) with blue laser diode (LD), and their respective evaluation systems. The 20 GB system consists of a 0.6 mm substrate disk system (System #1) with a numerical aperture (NA) 0.65 objective lens. On the other hand, the 35 GB system consists of a 0.1 mm cover layer disk system (System #2) with a NA0.85 objective lens. Moreover, we considered the two advantages and disadvantages, and future technical progress. Consequently, we considered that System #1 is fit for personal computer (PC) applications, and System #2 is fit for video disk recorder applications, such as prolonged high definition (HD) video recording of broadcasting satellite (BS) digital broadcasting.
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