Title :
Key technology for high density rewritable DVD (DVD-RAM)
Author :
Satoh, Isao ; Ohara, Shunji ; Akahira, Nobuo ; Takenaga, Mutsuo
Author_Institution :
Opt. Disc Syst. Dev., Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
3/1/1998 12:00:00 AM
Abstract :
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 105 cycles. It is also concluded that DVD-RAM is high reliable and compatible for reading by DVD-ROM drives
Keywords :
multimedia computing; optical disc storage; random-access storage; video discs; 0.6 mm; 650 nm; AV; DVD-RAM; MPEG2; computer data; disc tilt; full-scale multi-media applications; guard fields; high density rewritable DVD; laser power; mark edge recording method; overwrite durability; phase change media; physical headers; read compatibility; sector position shifting; signal deterioration; single-spiral wobbled land and groove format; storage capacity; Audio recording; Costs; DVD; Disk recording; Lenses; Optical films; Optical recording; Optical sensors; Phase change materials; Read-write memory;
Journal_Title :
Magnetics, IEEE Transactions on
