Microsoft Dev Drive launched for developers

Microsoft has announced the launch of Dev Drive, a new storage volume designed to meet the performance, security, and control needs of developers. Built on the Resilient File System (ReFS) and combined with a new performance mode capability in Microsoft Defender Antivirus, Dev Drive delivers up to 30% faster build times compared to the current Windows 11 (22H2) configurations available in the market.

Microsoft Dev Drive launched for developers: Optimized Storage for Developer Performance and Security

The development of Dev Drive was driven by feedback from the developer community, which highlighted that slow file input/output performance was a significant disruption to productivity. In response, Microsoft conducted a detailed analysis of the file system to identify and address performance bottlenecks. The company established benchmarks across multiple end-to-end developer scenarios and programming languages to guide improvements.

One of the key enhancements is the introduction of asynchronous scanning for Dev Drive, now available in public preview. This feature allows Microsoft Defender Antivirus to perform background scanning on Dev Drive volumes without affecting the security posture of the system drive or other drives. Compared to traditional folder or process exclusions commonly used by developers, asynchronous scanning provides enhanced security and improved performance. The result is a significant boost to build performance, particularly for file-intensive development workflows. Further technical details are available in Microsoft's guidance on protecting Dev Drive using performance mode.

Developer Control and Configuration

Beyond performance gains, Dev Drive is designed to give developers greater control over their storage environment. While Microsoft provides recommended configurations and default settings, developers and administrators retain the flexibility to further customize Dev Drive to suit their specific needs.

Administrators, for instance, can modify the behavior of the filter manager to control which filters are applied. This allows developers to add additional filter drivers for application compatibility or, conversely, to remove filters to maximize performance for specific scenarios with different security requirements.

Modern User Experience for Disk Management

Microsoft has also introduced a streamlined user experience for setting up and managing Dev Drive. Tasks that previously required the legacy “Disk Management” tool can now be performed within the modern Settings app. Developers can create Dev Drives, attach virtual hard disks (VHDs), resize disks, and manage partitions—all from a single, simplified interface. The updated Disks & Volumes UI provides intuitive controls for setting up Dev Drive and VHD scenarios.

Usage Recommendations and Limitations

Microsoft recommends that developers store working directories, repositories, and package caches on a Dev Drive to take full advantage of its performance benefits. The company is actively working with partners to adopt Dev Drive by default across tools such as Visual Studio and Dev Box, as well as features like Copy on Write.

However, due to its minimal set of enabled filter drivers, not all applications and features are supported on Dev Drive. Applications that rely on specific filters may not function properly. Developers are advised to test their workflows and, if necessary, enable additional filters or install tools on other drives to ensure compatibility.

Benchmarks and Testing Approach

To validate the performance benefits of Dev Drive, Microsoft implemented a rigorous two-part testing strategy:

• Automated performance tests were integrated into the build pipeline to track improvements on a build-by-build basis.
• Regular end-to-end scenario testing and profiling ensured comprehensive performance validation.
   

The performance tests, run within Microsoft's build labs, monitored operations such as git clone, commit, and other key developer tasks to ensure consistent improvements and to detect potential regressions.

In addition to automated testing, Microsoft developed synthetic benchmarks to evaluate common developer workloads across languages and frameworks, including Python, Node.js, .NET, and Java. Collaboration with the Storage & File Systems and Defender teams enabled detailed tracing and validation of performance improvements, with further refinements applied based on the results.

The tests used a standardized hardware environment consisting of Surface Laptop 4 devices. Common public repositories and real-world scenarios were assessed, including:

• Building the Orchard Core project with .NET
• Running Django tests
• Building the Spring Framework project using Gradle
• Cloning a Node.js repository with Git
   

The results demonstrated that file-intensive scenarios experienced the most significant performance gains with Dev Drive.

Looking Ahead

The introduction of Dev Drive marks the beginning of ongoing improvements for developer productivity within the Windows ecosystem. Recognizing the wide range of hardware configurations in use, Microsoft invites developers to test Dev Drive in their own environments and provide feedback through the Feedback Hub under the Dev Drive category.