磁盘和护套的物理要求和磁盘的磁要求，以及磁盘上记录的模拟图像、时间压缩音频信号、数字数据和控制信息的信号记录格式，以确保525线60场和625线50场系统模拟记录格式的互换性。交叉引用:ISO/R 527ASTM D257

Physical requirements for the magnetic disk and jacket and magnetic requirements for the disk, together with signal recording formats of analogue picture, time compressed audio signals, digital data and control information recorded on the disk to ensure interchangeability for analogue recording formats for 525 line 60 field and 625 line 50 field systems.Cross References:ISO/R 527ASTM D257