信息技术.数据交换用12,7mm的384道盒式磁带.Ultrium-1格式

[中文适用范围]： 本国际标准规定了盒式磁带的物理和磁性特性，使用 12.65 毫米宽的磁带，以便在驱动器之间提供此类盒式磁带的物理交换。 它还规定了记录信号的质量、记录方法和记录格式，从而允许通过此类盒式磁带在驱动器之间进行数据交换。 该格式支持可变长度逻辑记录、高速搜索以及使用注册算法进行数据压缩。 该国际标准根据盒中所含胶带的长度规定了四种类型的盒式磁带。 这四种类型称为A型、B型、C型和D型；它们的标称容量分别为100 GB、50 GB、30 GB和10 GB。 注 - 1 GB 包含 1 000 000 000 字节。 系统之间的信息交换还至少需要交换双方就交换代码以及交换盒上的信息的结构和标签的规范达成一致。 本国际标准只能与 ISO/IEC 22091 结合使用。 与卷和文件结构标准（例如标准 ISO 1001）一起，本文件提供了数据处理系统之间的完整数据交换。 [外文原描述]： ISO/IEC 22050:2002 specifies the physical and magnetic characteristics of magnetic tape cartridges, using magnetic tape 12,65 mm wide so as to provide physical interchange of such cartridges between drives. It also specifies the quality of the recorded signals, the recording method and the recorded format, thereby allowing data interchange between drives by means of such cartridges. The linearly recorded format, called Ultrium-1, has 384 tracks. It uses a timing based servo for improved track following. The format supports variable length Logical Records, high speed search, and the use of a registered algorithm for data compression. ISO/IEC 22050:2002 specifies four types of cartridges depending on the length of tape contained in the case. These four types are referred to as Type A, Type B, Type C and Type D; their nominal uncompressed capacity is 100 Gbytes, 50 Gbytes, 30 Gbytes and 10 Gbytes, respectively. Together with a standard for volume and file structure this document provides for full data interchange between data processing systems.