usb_modeswitch是一个模式切换工具，用于控制含有多个USB子设备的USB设备。如果你使用过3G的无线上网卡，你应该会很清楚的了解到这一点。

具体点来说，目前一些新的USB设备在内部含有windows驱动，当你第一次插入的时候，它作为一个闪存，并提示你安装驱动。

在安装驱动之后，驱动会自动切换USB设备的模式，存储设备将会消失（大多数情况），新的设备将会产生（如USB类型的Modem）。

这种特征被无线设备的制造商称其为“免CD”的设备。



目前许多这种设备都可以在Linux的驱动下工作，如"usb-storage"（存储设备的驱动模块）和"options"（高速Modem的驱动模块)，

接下来的事情就是如何从存储设备到Modem的切换-The usb_modeswitch are a mode switching tool used to control the child devices containing multiple USB USB equipment. If you are using a 3G wireless network card, you should clearly understand this. Specific point, some of the new USB device containing internal windows driver, when you first insert it as a flash memory, you are prompted to install the driver. After installing the driver, the driver will automatically switch the mode of the USB device, the storage device will disappear (in most cases), the new device will be generated (such as the type of USB Modem). This feature wireless equipment manufacturers referred to as " free CD"　equipment. Many of these devices are in the Linux driver work, such as USB-storage (storage device driver modules) and " options"　(High Speed ​ ​ Modem driver module), the next thing is how from the storage device to the Modem switching