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This is a branch of the Ext2Fsd project by Matt Wu where I try to implement support for metadata
checksums and jbd2. I have also updated the project so it can be compiled with Visual Studio 2017
and Visual Studio 2019. This is work in progress. If you need a stable driver you should get the
latest official release from
The current status of the development is that all metadata checksums is implemented and jbd2 is
ported to support 64-bit blocknumbers.
The driver is now ready to be tested!
This work is dedicated to my mother Berit Ingegerd Branten.
Bo Branten <>


To test this driver run one of the installation programs: for Windows 8 - Windows 10. for Windows XP - Windows 7.
If you compile the driver yourself you only need to run the installation program once, then you can
copy your driver file over the old in \windows\system32\drivers.
Now you can read and write ext4 filesystems using the new features metadata checksums and 64-bit
blocknumbers from Windows.
(sorry I can not sign drivers so you need to turn of Windows checking for that during testing)
official site:
my site:


Ext4Fsd is an ext2/3/4 file system driver for Windows (XP/Vista/7/8/10).
It's a free and open-source software, everyone can modify or distribute under GNU GPLv2.

Development Website

Matt Wu <>

Active Developers

Matt Wu :

KaHo Ng :

Bo Branten :

Supported Features by Ext4Fsd

1, flexible inode size: > 128 bytes, up to block size
2, dir_index:    htree directory index
3, filetype:     extra file mode in dentry
4, large_file:   > 4G files supported
5, sparse_super: super block backup in group descriptor
6, uninit_bg:    fast fsck and group checksum
7, extent:       full support with extending and shrinking.
8, journal:      only support replay for internal journal
9, flex_bg:      first flexible metadata group
10, symlink and hardlink
11, mount-as-user: specifed uid/gid by user

Unsupported Ext3/4 Features

1, journal: log-based operations, external journal
2, EA (extended attributes), ACL support


Ext4 file system driver for Windows






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