Windows Server Gains Native ReFS Boot Support After 14 Years
Microsoft has finally enabled the ability to boot Windows Server directly from a Resilient File System (ReFS) volume, a feature absent since ReFS’s introduction in 2012. This update, available in the latest Windows Server Insider Preview builds, marks a significant step forward for the file system, offering enhanced data integrity, scalability, and resilience compared to the traditional NTFS.
The Long Road to ReFS Boot
Launched with Windows Server 2012, ReFS was designed to address the evolving demands of modern storage environments. Over the years, Microsoft has consistently improved ReFS, adding features like tiered storage support, faster metadata operations (2013), block cloning for virtual machines and databases, sparse VDL for faster virtual disk creation, and improved Hyper-V integration (2016), and further performance and integrity enhancements with Windows Server 2019 and 2022 [1]. Despite these advancements, booting directly from a ReFS volume remained unsupported – until now.
Advantages of ReFS Boot Over NTFS
Microsoft highlights several key benefits of booting Windows Server with ReFS:
- Enhanced Data Integrity: ReFS can detect and repair data corruption online, without requiring a chkdsk scan, minimizing downtime and ensuring data availability.
- Reduced Crash-Induced Corruption: The integrity-first design of ReFS reduces the risk of file system corruption caused by unexpected system crashes.
- Increased Volume Capacity: ReFS supports volumes up to 35 petabytes (35,000 terabytes), eliminating storage capacity limitations [3].
- Optimized Virtualization: ReFS utilizes block cloning and sparse provisioning, accelerating the creation and expansion of large virtual hard disk (VHD(X)) files and improving large file copy operations [1].
How to Test ReFS Boot
Currently, ReFS boot support is available to Windows Server Insiders. To test the feature, users must:
- Install the latest Windows Server vNext Insider Preview build (build 29531.1000.260206-1841 or later as of February 11, 2026) [1].
- During the installation process, format the system partition (C:) as ReFS through the installation user interface.
Microsoft notes that ReFS boot requires Unified Extensible Firmware Interface (UEFI) firmware and does not support legacy BIOS boot [3].
What is ReFS?
The Resilient File System (ReFS) is a modern file system designed by Microsoft to maximize data availability, scale efficiently, and maintain data integrity. It uses checksums to detect and correct corruption, and integrates with Storage Spaces for automatic repair of corrupted data [1].
Looking Ahead
The introduction of ReFS boot support represents a significant milestone for Windows Server, offering a more robust and scalable foundation for modern workloads. As Windows Server 2016 nears its conclude of support, this update provides a compelling reason for organizations to upgrade and embrace the benefits of ReFS.