# maharmstone/btrfs

WinBtrfs - an open-source btrfs driver for Windows

Repository: https://github.com/maharmstone/btrfs
Canonical: https://ross.abutalabs.com/products/btrfs
Language: C
License: LGPL-3.0
License Family: copyleft
Topics: btrfs, windows
Last push: 2026-08-26T07:20:51+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 8, longevity 100
- inputs: {"age_days": 3846, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 7637, forks 298 (observed 2026-08-28T04:10:02.127065+00:00)

## What it is
WinBtrfs is an open-source Btrfs filesystem driver for Windows, reimplemented from scratch in C with no Linux kernel code. It supports reading and writing Btrfs volumes including RAID0/1/5/6/10, compression, subvolumes, snapshots, and send/receive.

## Use cases
- read a btrfs partition from windows
- mount linux btrfs drive on windows
- access btrfs raid5 array from windows
- boot windows from btrfs filesystem
- convert between ntfs and btrfs workflows
- share a btrfs disk between linux and windows dual boot

## When to choose
- you dual-boot Windows and Linux and need to access Btrfs volumes from Windows
- you need RAID5/6 or subvolume/snapshot support for Btrfs on Windows
- you use WSL/LXSS with Btrfs-formatted disks

## When to avoid
- you only need read-only access and prefer a simpler userspace tool
- you need zoned (HM-SMR) or full fs-verity support, which are not yet implemented
- you cannot tolerate filesystem risk - always keep backups when using it

## Facets
- artifact type: library
- maturity: active
- function: file-system, compression, security
- domain: files, operating-systems, developer-tools
- platform: windows, cpp
- tags: btrfs, filesystem-driver, kernel-driver, raid, windows-driver, reactos

## Member repositories
- maharmstone/btrfs (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:02.127065+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:36:46.846147+00:00, confidence not recorded.
  - readme: https://github.com/maharmstone/btrfs (fetched 2026-08-28T04:10:02.127065+00:00, sha dcfba8ae5e6b)
- Data as of 2026-08-30T08:39:29.467469+00:00.