DVD has already become a kind of standard of sound and image products, and the DVD machine also wants and permits the VCD, CD etc. so the servo system in the player of DVD decides the whole function of DVD player directly.

• DVD已经成为音像制品的一种标准，而且DVD机还要兼容VCD、CD等光盘，因此DVD播放机内的伺服系统直接决定着整个DVD播放机的性能。