The I2O model makes I/O device drivers portable across multiple operating systems,processors and bus technologies by splitting them in half -- the Operating System Service Module and the Hardware Device Module.

• I2O模块通过把I/O设备驱动程序一分为二，即操作系统服务模块与硬件设备模块，使其能在多种操作系统、处理器和总线技术上进行移植。