---
title: IOUSBDFUDescriptor
framework: IOKit
role: symbol
role_heading: Structure
platforms: [Mac Catalyst 13.0+, macOS 10.2+]
path: iokit/iousbdfudescriptor
---

# IOUSBDFUDescriptor

## Declaration

```occ
typedef struct IOUSBDFUDescriptor {
    ...
} IOUSBDFUDescriptor;
```

## Overview

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

## Topics

### Instance Properties

- [bDescriptorType](iokit/iousbdfudescriptor/1425534-bdescriptortype.md)
- [bLength](iokit/iousbdfudescriptor/1426372-blength.md)
- [bmAttributes](iokit/iousbdfudescriptor/1425765-bmattributes.md)
- [wDetachTimeout](iokit/iousbdfudescriptor/1426083-wdetachtimeout.md)
- [wTransferSize](iokit/iousbdfudescriptor/1426303-wtransfersize.md)

## See Also

### Related Documentation

- [IOUSBDFUDescriptor](iokit/usb_h_user-space/iousbdfudescriptor.md)