Windows 11 introduces Dev Drives, a specialized storage volume for developers that utilizes the ReFS file system and offers optimizations for performance. Dev Drives can improve performance by up to 41% in development tasks, such as cloning the NodeJS repository, and provide a 22% enhancement in build times for projects like OrchardCore with DotNet. They are compatible with Microsoft Defender in "performance mode," which reduces scanning frequency to enhance read and write speeds. Microsoft recommends using Dev Drives solely for source code repositories, project files, package caches, and build outputs, avoiding typical downloaded files or installed applications to mitigate security risks. Developers can create Dev Drives on a physical partition for better performance or on a virtual hard drive (VHD) for flexibility and portability, although transferring them to different PCs is not advised. While Dev Drives offer speed advantages, they should not be repurposed for general use, as this could expose users to security risks.