Overwriting phase change media by varying data patterns

摘要: A phase change overwrite system that reduces the material flow which results from repeated overwrites of same data on media. Two techniques can be used to solve degradation problem. The first is exploit fact a given sequence represented by multiple bit patterns. This choice in patterns primarily for use reducing low frequency content pattern. However, some available may other purposes, such as ensuring pattern not always used. second technique vary point at writing begins. possible ROM type format because new are written exactly location old data. Therefore, if data, it optional whether or Note typically header information and same. Accordingly, this opportunity varying where begins even when user completely different older