信息技术.120mm DVD可重写光盘(DVD-RAM

[中文适用范围]： 本国际标准规定了 120 毫米光盘的机械、物理和光学特性，以实现此类光盘的互换。 它规定了记录信号的质量、数据格式和记录方法，从而允许通过此类磁盘进行信息交换。 使用相变方法可以多次写入、读取和覆盖数据。 该磁盘被识别为 DVD-RAM。 本国际标准规定 - 该磁盘的两种相关但不同的类型（见第 7 条）; ——一致性条件; ——磁盘测试、操作和存储的环境; ——磁盘的机械、物理和尺寸特性。 磁盘，以便在数据处理系统之间提供机械交换; ——磁盘上信息的格式，包括磁道和扇区的物理配置、纠错码和编码方法; ——所记录信号的特性磁盘上，从而使数据处理系统能够从磁盘读取数据。 该国际标准规定了光盘驱动器之间的磁盘交换。 它与卷和文件结构标准一起提供了数据处理系统之间的完整数据交换。 本国际标准规定的光盘可以按照其中规定的 ISO/IEC 16825 封装在盒子中。 [外文原描述]： This International Standard specifies the mechanical, physical and optical characteristics of a 120 mm optical disk to enable interchange of such disks. It specifies the quality of the recorded signals, the format of the data and the recording method, thereby allowing for information interchange by means of such disks. The data can be written, read and overwritten many times using the phase change method. This disk is identified as DVD-RAM. This International Standard specifies - two related but different Types of this disk (see clause 7), - the conditions for conformance, - the environments in which the disk is to be tested, operated and stored, - the mechanical, physical and dimensional characteristics of the disk, so as to provide mechanical interchange between data processing systems, - the format of the information on the disk, including the physical disposition of the tracks and sectors, the error correcting codes and the coding method, - the characteristics of the signals recorded on the disk, thus enabling data processing systems to read the data from the disk. This International Standard provides for the interchange of disks between optical disk drives. Together with a standard for volume and file structure, it provides for full data interchange between data processing systems. The optical disks specified by this International Standard may be enclosed in cases according to ISO/IEC 16825 as specified therein.