---
title: IOUSBDFUDescriptor
framework: usbdriverkit
role: symbol
role_heading: Structure
path: usbdriverkit/iousbdfudescriptor
---

# IOUSBDFUDescriptor

A structure that defines the USB device firmware update descriptor.

## Declaration

```occ
struct IOUSBDFUDescriptor;
```

## Overview

Overview See the USB Device Firmware Update Specification at http://www.usb.org.

## Topics

### Accessing the Descriptor Properties

- [bLength](usbdriverkit/iousbdfudescriptor/blength.md)
- [bDescriptorType](usbdriverkit/iousbdfudescriptor/bdescriptortype.md)
- [bmAttributes](usbdriverkit/iousbdfudescriptor/bmattributes.md)
- [wDetachTimeout](usbdriverkit/iousbdfudescriptor/wdetachtimeout.md)
- [wTransferSize](usbdriverkit/iousbdfudescriptor/wtransfersize.md)