现在都流行U盘用量产工具定制成虚拟光驱，那么原理是怎样的呢，其实很简单，看看源码就明白了-U are now popular custom set amount of production tools into the virtual drive, then how are we doing principle, it is actually very simple, look at the source to understand the

此例程将板子上的SST25VF016B虚拟为2M BYTES的U盘，可以通过PC用USB接口访问磁盘-This routine will be on board for the 2M BYTES SST25VF016B virtual U-disk, you can use the USB interface to access the disk PC