Windows 2000 and later include a driverthat supports bulk-only and CBI devices. When a device’s descriptors identify the device as mass-storage class, the operating system loads the USB storage port driver (usbstor.sys). This driver manages communications between the lower-level USB drivers and Windows’ storage-class drivers. When the device is formatted using a supported file system, the operating system assigns a drive letter to the device and the device appears in My Computer.
参考链接: usb complete 3rd edition Page 234/593
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