However each side of these shellac discs could only play about 3 or 4 minutes of music, and record companies realized that if they wanted a longer playing record, they would need a tougher material, one that could handle smaller grooves.

然而，这些虫胶光盘的每一面只能播放大约3或4分钟的音乐，唱片公司意识到，如果他们想要播放更长的时间，他们需要一种更坚韧的材料，可以承受较小的凹槽。