To install the Focusrite USB driver on Windows 7, your system must be fully up to date. You can still download and install previous versions of the driver if your product was previously supported on Windows 7. See Content Security Features in applies to: Scarlett 1st/2nd/3rd Generation, Clarett USBĭriver releases after September 2021 will not support Windows 7. Some content security functionality is implemented in Usbccgp.sys. Recommended driver: USB Generic Parent Driver (Usbccgp.sys). WUDFUsbccidDriver.dll is a user-mode driver for USB CCID Smart Card Reader devices. The WUDFUsbccidDriver.dll UMDF driver replaces the Usbccid.sys driver. For more information about smart card drivers in Windows, see Smart Card Design Guide. Microsoft provides the Usbccid.sys mini-class driver to manage USB smart card readers. The driver is loaded when a SuperSpeed hub is attached to an xHCI controller. Microsoft provides the Usbhub3.sys driver for managing SuperSpeed (USB 3.0) USB hubs. For more information about the relationship between the hub class driver and the USB stack, see USB host-side drivers in Windows. Microsoft provides the Usbhub.sys driver for managing USB hubs. Uaspstor.sys is the class driver for SuperSpeed USB devices that support bulk stream endpoints. SubClass (06) and Protocol (62)Uaspstor.sys For information about Windows storage support, see the Storage Technologies website. For an example device stack that is managed by this driver, see Device Object Example for a USB Mass Storage Device. Microsoft provides the Usbstor.sys port driver to manage USB mass storage devices with Microsoft's native storage class drivers. For information about implementation of the printer class in Windows, see the Printing - Architecture and Driver Support website. Microsoft provides the Usbprint.sys class driver that manages USB printers. Two important device setup classes for USB devices are as follows: For more information, see System-Defined Device Setup Classes. IHVs and OEMs can define new device setup classes, but only if none of the existing classes apply. Microsoft defines setup classes for most devices. Windows categorizes devices by device setup classes, which indicate the functionality of the device. The current list of USB class specifications and class codes is documented in the USB-IF Defined Class Code List. If some of the device's capabilities aren't implemented by the class driver, vendors should provide supplementary drivers that work with the class driver to support the entire range of functionality provided by the device.įor general information about USB-IF approved device classes see the USB Common Class Specification Windows class drivers might not support all of the features that are described in a class specification. Hardware vendors shouldn't write drivers for the supported device classes. If a device that belongs to a supported device class is connected to a system, Windows automatically loads the class driver, and the device functions with no other driver required. Microsoft provides in-box drivers for several of those device classes, called USB device class drivers. Each device class is identified by a USB-IF approved class, subclass, and protocol codes, all of which are provided by the IHV in device descriptors in the firmware. The USB-IF defines those classes and their specifications. USB device classes are categories of devices with similar characteristics and that perform common functions. More guidelines are included in Choosing a driver model for developing a USB client driver. If a Microsoft-provided driver isn't available for the USB device class to which your device belongs, then consider using generic drivers, Winusb.sys or Usbccgp.sys. If you are writing a custom driver: Before writing a driver for your USB device, determine whether a Microsoft-provided driver meets the device requirements. The drivers are updated through Windows Update. They're available in the \Windows\System32\DriverStore\FileRepository folder. These drivers and their installation files are included in Windows. If you are installing USB drivers: You don't need to download USB device class drivers. For non-composite devices or a function of a composite device, use WinUSB (Winusb.sys).For composite devices, use USB Generic Parent Driver (Usbccgp.sys) that creates physical device objects (PDOs) for each function.Microsoft-provided drivers for USB-IF approved device classes.This article lists the Microsoft-provided drivers for the supported USB device classes. If you are a customer experiencing USB problems, see Troubleshoot common USB problems
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