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WinBtrfs is a Windows driver for the next-generation Linux filesystem Btrfs. A reimplementation from scratch, it contains no code from the Linux kernel, and should work on any version from Windows XP onwards. It is also included as part of the free operating system ReactOS.

If your Btrfs filesystem is on a MD software RAID device created by Linux, you will also need WinMD to get this to appear under Windows.

See also Quibble, which is an experimental bootloader allowing Windows to boot from Btrfs.


  • Reading and writing of Btrfs filesystems
  • Basic RAID: RAID0, RAID1, and RAID10
  • Advanced RAID: RAID5 and RAID6
  • Caching
  • Discovery of Btrfs partitions, even if Windows would normally ignore them
  • Getting and setting of Access Control Lists (ACLs), using the xattr security.NTACL
  • Alternate Data Streams (e.g. :Zone.Identifier is stored as the xattr user.Zone.Identifier)
  • Mappings from Linux users to Windows ones (see below)
  • Symlinks and other reparse points
  • Shell extension to identify and create subvolumes, including snapshots
  • Hard links
  • Sparse files
  • Free-space cache
  • Preallocation
  • Asynchronous reading and writing
  • Partition-less Btrfs volumes
  • Per-volume registry mount options (see below)
  • zlib compression
  • LZO compression
  • LXSS ("Ubuntu on Windows") support
  • Balancing (including resuming balances started on Linux)
  • Device addition and removal
  • Creation of new filesystems with mkbtrfs.exe and ubtrfs.dll
  • Scrubbing
  • Reflink copy
  • Subvol send and receive
  • Degraded mounts
  • Free space tree (compat_ro flag free_space_cache)
  • Shrinking and expanding
  • Passthrough of permissions etc. for LXSS
  • Zstd compression
  • Windows 10 case-sensitive directory flag
  • Oplocks


  • Defragmentation
  • Support for Btrfs quotas
  • Windows 10 reserved storage
  • Full transaction log support
  • Three- and four-disk RAID1 (Linux 5.5)
  • New checksum types (xxhash, sha256, blake2) (Linux 5.5)
  • Metadata UUID incompat flag (Linux 5.0)
  • Support for Windows transactions (TxF)

by maharmstone.

Que novedades incluye la versión   See changelog


  • Fixed bug preventing new directories from appearing in listings
  • Fixed Release version of driver still not working on XP

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