{
  "status": "shipping",
  "advantages": [],
  "limitations": [],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-21",
  "slug": "refs",
  "term": "ReFS",
  "aliases": [
    "Resilient File System"
  ],
  "definition": "ReFS is a Windows file system with checksummed metadata, optional file-data integrity streams and repair integration with resilient storage.",
  "note": "Repair through Storage Spaces requires a usable alternate copy supplied by a mirror or parity space. Detection alone cannot recreate missing bytes. Keeping a volume available while isolating uncorrectable corruption does not mean every file remains accessible. [refs-overview]\n\nNTFS and ReFS are distinct file systems, not interchangeable integrity settings. File-data coverage in ReFS must be assessed through integrity streams rather than inferred from the volume's name. [refs-overview]\n\nBlock cloning requires matching integrity-stream settings and the same ReFS volume. Shared regions avoid a physical copy until modifying writes allocate new storage. A clone therefore does not establish an independent recovery copy. [refs-clone]",
  "related": [
    "ntfs",
    "refs-integrity-streams",
    "checksum",
    "data-scrubbing",
    "mirroring",
    "file-storage",
    "reflink"
  ],
  "citations": [
    {
      "id": "refs-overview",
      "title": "Microsoft Learn: ReFS overview, resiliency and Storage Spaces integration",
      "url": "https://learn.microsoft.com/en-us/windows-server/storage/refs/refs-overview",
      "accessed": "2026-10-21"
    },
    {
      "id": "refs-clone",
      "title": "Microsoft Learn: ReFS block-cloning integrity compatibility and shared allocation",
      "url": "https://learn.microsoft.com/en-us/windows-server/storage/refs/block-cloning",
      "accessed": "2026-10-21"
    }
  ],
  "provenance": [
    "Microsoft's cited ReFS overview applies to Windows Server 2016, 2019, 2022 and 2025; feature support must be checked for the intended release and deployment."
  ]
}