---
title: IOUSBDFUDescriptor
framework: IOKit
role: pseudoSymbol
platforms: []
path: iokit/usb_h_user-space/iousbdfudescriptor
---

# IOUSBDFUDescriptor

## Declaration

```occ
struct IOUSBDFUDescriptor {
   UInt8 bLength;
   UInt8 bDescriptorType;
   UInt8 bmAttributes;
   UInt16 wDetachTimeout;
   UInt16 wTransferSize;
};
```

## Overview

USB Device Firmware Update Descriptor. See the USB Device Firmware Update Specification at [http://www.usb.org](../../link-1670329.md).

## See Also

### Related Documentation

- [IOUSBDFUDescriptor](../../kernel/iousbdfudescriptor.md)