Resilient File System ( ReFS), codenamed 'Protogon', is a Microsoft proprietary file system introduced with Windows Server 2012 with the intent of becoming the 'next generation' file system after NTFS. com /en-US /windows-server /storage /refs /refs-overview Windows 8.1 and later (ReFS volume creation ability removed in Windows 10's 2017 Fall Creators Update, except for Windows 10 Enterprise and Pro for Workstations )ĭocs.