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四、DVD-RAM与DVD-Video视频记录标准 作为盘片基本参数,DVD—RAM设计有两种版本标准,一种是1.0版本,容量为2.6GB,于1997年7月建立;另一种是2.1版本,容量为4.7GB,于1999年5月公布。两种版本DVD—RAM光盘的发行既有盘盒装样式,也有裸片样式。由于2.1版本DVD—RAM的轨迹间距、数位长度、记录速度(双倍速)等都较1.0版本DVD—RAM有了改进,因此在回放、记录与存取等特性方面,必然比1.0版本更优异(详见表3)。
Fourth, DVD-RAM and DVD-Video video recording standard As the basic parameters of the disc, DVD-RAM design has two versions of the standard, a version is 1.0, a capacity of 2.6GB, established in July 1997; the other is Version 2.1, with a capacity of 4.7GB, was released in May 1999. Both versions of DVD-RAM discs are available both in disc and cartridge styles. Since version 2.1 of DVD-RAM has improved track pitch, digit length, recording speed (double speed) and so on compared to version 1.0 of DVD-RAM, it must be superior to version 1.0 in terms of playback, recording and access See Table 3 for details).