---
page_type: sample
description: "The CD-ROM file system driver (CDFS) sample is a file system driver for removable media."
languages:
- cpp
products:
- windows
- windows-wdk
---

# CDFS File System Driver

The CD-ROM file system driver (cdfs) sample is a sample file system driver that you can use to write new file systems.

Cdfs is a read-only file system that addresses various issues such as accessing data on disk, interacting with the cache manager, and handling various I/O operations such as opening files, performing reads on a file, retrieving information on a file, and performing various control operations on the file system. The Cdfs file system is included with the Microsoft Windows operating system.

## Universal Windows Driver Compliant

This sample builds a Universal Windows Driver. It uses only APIs and DDIs that are included in OneCoreUAP.