光盘的实际容量往往是人们选择光盘的重要参考依据。比方说,对音乐光盘而言,实际容量越大就意味着记录的音乐时间越长、歌曲越多;对素材类光盘而言,实际容量越大,往往意味着存储的图象更多、分辨率更高;对游戏类光盘而言,实际容量越大,往往意味着更逼真的图象、更动人的音效……但因购买时条件所限,不少情况下没有计算机可供准确测量,那么有没有什么简便的方法粗略估算一下呢? 大家都知道,光盘是以由内向外的螺旋形轨道来记录数据的,因此要是能知道轨道的总长度就可以准确测出光盘的实际容量,可是这些轨道并非肉眼可见,而且很长,要想准确测出,在实际上并不可行。但由于轨道的间距很小(仅1.6μm),而且间距相等,所以可以近似用面积来表示一特定区域内轨道的总长 The actual capacity of the disc is often an important reference for people to choose the disc. For example, for a CD-ROM, the actual capacity means that the longer the music is recorded, the more songs. For the CD-ROM, the actual capacity is larger, which means more images are stored and the resolution For gaming CDs, the actual capacity of the larger, often means more realistic images, more moving sound ... However, due to the conditions of the purchase, in many cases there is no computer for accurate measurement, Is there any easy way to make a rough estimate? As we all know, the disc records data from inside to outside spiral track, so if you can know the total length of the track can accurately measure the actual capacity of the disc, but These tracks are not visible to the naked eye, and they are very long. To accurately measure these tracks is not practically feasible. However, since the orbital intervals are very small (only 1.6 μm) and are equally spaced, the total length of the orbit in a particular area can be approximated by area