Key technology for high density rewritable DVD (DVD-RAM)

作     者：Satoh, I Ohara, S Akahira, N Takenaga, M 

作者机构：Matsushita Elect Ind Co Ltd Opt Disc Syst Dev Ctr Osaka 571 Japan 

出 版 物：《IEEE TRANSACTIONS ON MAGNETICS》 (IEEE Trans Magn)

年 卷 期：1998年第34卷第2期

页      面：337-342页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0702[理学-物理学] 

主　　题：DVD Optical recording Read-write memory Optical sensors Phase change materials Optical films Lenses Costs Disk recording Audio recording 

摘      要：DVD-RAM requires a large storage capacity to write and read huge amounts of data such as MPEG2 and AV as well as computer data for full-scale multi-media applications. Its format is focused on unifying AV and computer files, and achieving read compatibility with DVD-ROM drive. DVD-RAM has been realized by using phase change media, 0.6 mm substrate, 650 nm laser and NA 0.6 lens. The track has a single-spiral wobbled land and groove format. Each sector in land and groove tracks can be accessed in a seamless manner by combining physical headers and the wobble signal. 8-16 modulated signal is overwritten on land and groove tracks with mark edge recording method, The sector position shifting of 8 bytes and two guard fields located at the top and end of the data field are introduced to prevent the signal deterioration caused by repeating overwrites. DVD-RAM disc has wide tolerances of laser power and disc tilt, and overwrite durability of over 10(5) cycles. It is also concluded that DVD-RAM is high reliable and compatible for reading by DVD-ROM drives.