Abstract Multilevel data storage (ML) is a new method in the optical storage field, which is also a trend for improving the capability of future optical discs. This article introduces several ML methods based on phase-change media including pit depth modulation (PDM) and mark radial width modulation (MRWM). In addition, some disadvantages and advantages concerning the principle of these methods will be discussed. Finally, a new ML method will be advanced, through which the levels in one recording pit will be increased evidently.
Received: 06 September 2003
Revised: 30 September 2003
Accepted manuscript online:
Fund: Project supported by the State Key Development Program For Basic Research of China (Grant No 19990330).
Cite this article:
Xiao Jia-Xi (肖家曦), Qi Guo-Sheng (齐国生), She Peng (佘鹏), Liu Rong (刘嵘), Xu Duan-Yi (徐端颐) Multilevel optical data recording methods on phase-change media 2003 Chinese Physics 12 1241
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
