Ext2Fsd Project

Open source ext3/4 file system driver for Windows (2K/XP/WIN7/WIN8)

Ext2Fsd 0.62 was released !

with 51 comments

Features implemented or bugfix since V0.61:
    1, FIXME: STEAM game cache (data) validation failures
    2, FIXME: WDK sources compiling random (rare) failures
Supported Ext3/4 features by 0.62:
    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
Unsupported Ext3/4 features:
    1, journal: log-based operations, external journal
    2, EA (extended attributes), ACL support
    3, symlink creation
Features to be implemented in next release:
    1, Reparse point support (hardlink, symbolic link etc)
    2, mounted as given user: privilege checking with given uid & gid
Files descriptions:
Ext2Fsd-0.62.exe:       setup wizard for Windows systems (Win2k, Winxp,
                        Vista, Win7, Win8, Server 2003, Server 2008/R2)
Ext2Fsd-0.62.7z:        Batch setup package in 7-zip
Ext2Fsd-0.62.zip:       Batch setup package in zip
Ext2Fsd-0.62.src.7z:    Source codes of Ext3Fsd and Ext2Mgr in 7-zip
Ext2Fsd-0.62.src.zip:   Source codes of Ext3Fsd and Ext2Mgr in zip
Download link:
Files checksum:
C:\Works\Ext2fsd\0.62>sha1sum Ext2Fsd-0.62*
362c59b91f2270d31561c5f3f264a162a8e9fdf7 *Ext2Fsd-0.62.7z
67f88afb643c7a722cc2ea0390815e252c44720b *Ext2Fsd-0.62.exe
0601689509726fade69fe9b5be3d1bb88fc98fea *Ext2Fsd-0.62.src.7z
e39c9bec0d7dd9685256ea392e410e6974d4ce9f *Ext2Fsd-0.62.src.zip
9cfe9d45225381edfe6c0ab41197fef1440446f0 *Ext2Fsd-0.62.zip
    The driver may crash your system and ruin your data unexpectedly,
    since there might be software conflicts and I could only test it
    on some of the popular platforms. You should use it with care and
    use it at your own risk!
Matt <mattwu@163.com>

Written by Matt

June 10th, 2015 at 12:55 am

Posted in Ext2Fsd,News

Tagged with ,

51 Responses to 'Ext2Fsd 0.62 was released !'

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  1. This driver has been causing BSODs, apparently regarding ntfs.sys and sometimes dxgkrnl.sys, on my Windows 7 64-bit install while playing Grand Theft Auto V (with Steam), even though the game is installed on the NTFS Windows partition. I haven’t seen this happen with other games or programs running. I hope it gets fixed. I uninstalled the driver and I haven’t gotten any more BSODs.


    30 Jun 15 at 6:41 am

  2. Sorry for waiting too long. We are going to investigate the problem you reported. However, the cause is uncertain since NTFS/Fastfat driver may have received some IRP which are not belonged to NTFS/Fastfat driver. That may help explain why the faulty module is NTFS.sys but not Ext2Fsd.sys


    30 Jun 15 at 4:45 pm

  3. Hi!
    Which filesystem would you recommend right now for best / maximum compatibility? ext2, or ext3, or ext4 ?

    Also: If it is ext4 used then should turn off the journalling? [Y/N]


    30 Jun 15 at 11:01 pm

  4. ext4 for better performance, haha. Also, you don’t need to turn off journalling.


    1 Jul 15 at 1:05 am

  5. Hi again. I am very pleased with the new 0.62 (latest version). However have found a couple of issues:

    1) cannot execute .exe installer file when it’s located on EXT4 volume. Error code: 0x800704b3

    2) cannot download file in firefox directly on to the EXT4 volume.

    In both of the cases, it was possible to perform the file operation on NTFS disk instead, by copying it on/off the EXT4 volume. Just would be nicer / more pleasant experience to work natively?

    Perhaps such operations are using slightly different or other kinds of win32 or .NET api.


    12 Jul 15 at 12:34 am

  6. Could both operations be performed on EXT2 filesystem?


    12 Jul 15 at 1:19 am

  7. it’s caused by the feature of security acl, which ext2fsd doesn’t support. But we can construct a grant-all access to avoid this issue, will do an experiment to check.


    12 Jul 15 at 11:10 am

  8. One of my friends fixed not working .exe issue with chmod 777


    2 Aug 15 at 5:50 pm

  9. About the .exe issue, you have to start WebClient service on Windows Services and it goes away.


    3 Aug 15 at 12:48 am

  10. Thanks. That helped indeed! Didn’t think WebClient would be involved here


    1 Sep 15 at 4:53 pm

  11. Will be there a Windows 10 compatible release? Or is it already compatible?


    15 Jul 15 at 10:48 pm

  12. Yes, 0.62 works with Windows 10. Soon we’ll release 0.63 with symlink and hardlink supported.


    15 Jul 15 at 11:54 pm

  13. Windows 10 Photos, Music and Videos apps gave a “couldn’t open file” error while trying to play them, but theis thumnails and the ones from the file explorer are correctly generated. Maybe a permissions or metadata magic issue? Using VLC videos and music gets played flawlessly…


    14 Aug 15 at 5:49 pm

  14. It doesn’t work on my clean install of Windows 10. I used to use it on Windows 7 just fine. I never get any errors when adding drive letters, but they never show up in File Explorer, and can’t be accessed by the system. Also they can’t be removed once they’ve been added. I have to Uninstall/Reinstall to remove a drive letter. It is useless to me in Windows 10. Sad.


    11 Dec 15 at 12:10 am

  15. I’m having the same problem. Sometimes I can get the drive to show in windows explorer but clicking it says “You need to format the disk in drive O: before you can use it.”


    2 Jan 16 at 2:32 pm

  16. Hello there,

    I’ve used Ext2fsd (version 0.62) on my Asus zenbook (Dual boot: UEFI/Win10/Mint)
    All went well so far, until I opened my ext4 partition under WIn10.
    I can only see a few directories:
    lost + found
    System Volume Information
    and 1 file: .ecryptfs

    and when I go into the directory “jerome” (would be home/jerome in Linux) I get only a few items:
    .cache (directory)
    and a Readme.txt with 1 line : \usr\share\ecryptfs-utils\ecryptfs-mount-private.txt

    Any idea why it’s so?
    I’d be very thankfull for any hint.



    29 Aug 15 at 1:17 am

  17. you installed your Mint and ciphered it, you have to install an encrypted home directory or learn how to decypher it.


    1 Sep 15 at 11:54 am

  18. Sorry, I meant, install a non encrypted FS/OS or unlock it in some way


    1 Sep 15 at 11:54 am

  19. Recently updated from 0.51 (Yeah, I was distracted and didn’t notice updates), very glad to see all the improvements, but when I tried validating warframe, it began a neverending cycle of bluescreens and autorestarts… Right now I have shutdown steam before it could start doing this yet another time. Is there anything I could do to help solve this?

    Liru Faers

    3 Sep 15 at 10:22 am

  20. Every time I start steam, the moment it looks at the Ext drive’s game library it bluescreens with BAD_POOL_HEADER. For some reason the BSOD isn’t showing a dump anywhere, and I can’t figure out why.

    Liru Faers

    3 Sep 15 at 5:15 pm

  21. Rolling back to 0.53 fixed this issue… so that’s a temporary fix.

    Liru Faers

    4 Sep 15 at 2:34 am

  22. Try to generate a minidump so can we help analyze it.

    Bo Brantén

    5 Sep 15 at 12:13 am

  23. Anything I should check in particular on Win 7 that might enable the minidump? I’ve been looking without finding anything.

    Liru Faers

    10 Sep 15 at 2:13 pm

  24. Hello, ext2fsd is a nice project but unfortunately I have found a performance problem when testing different drivers. To do “diff -r” on 50MB source files takes 5s on ext2fsd 0.48 and 42s on 0.50 and later versions including 0.62. All tests done with non debug version on an ext2 partition. As a comparsion the same operation takes 3s on ffsdrv and 85s on an fsd that doesn’t cache meta data (romfs) so its obvious thats its ext2fsd 0.48 value that is close to what to expect from a well behaved driver.

    Bo Brantén

    12 Sep 15 at 3:17 am

  25. I see. 🙂 Is the workload metadata-intensive?


    15 Sep 15 at 10:13 pm

  26. Yes, I used Linux source code for the test so it was many directories and small files. I also noticed that the CPU usage went up during the “diff -r” run.

    Bo Brantén

    16 Sep 15 at 1:40 am

  27. Hi,

    I’m trying to get ext4 partition fully-working on Windows and your driver works as charm 🙂 Well I get to the point where I tried to install Steam on that partition and tried to play games there (OK I realize I might be trying to live in dream world… but I can try right? 🙂 ) well the Steam installed and run completely fine, but when I tried to run a game I get “Windows cannot access D:\Steam\bin\SteamService.exe” error. Any suggestions?


    26 Sep 15 at 4:25 am

  28. I’ve used ext2fsd for years – thanks for a great product – but having an issue with Windows 10. The splash screen won’t go away. I can kill it with Alt-F4 to reveal the control panel but then that is not letting me mount any partitions.

    The Automatic mount option does not assign a drive letter. Mount via DefineDosDevice or Permanent mount point does, but the partition does not show up in Explorer.

    How to troubleshoot, please?


    30 Sep 15 at 8:51 pm

  29. oops! my bad: service wasn’t started! But still getting the splash screen hang, and after starting the service, and re-opening the control panel, it hangs again, can’t Alt-F4 out of it and after a while BSOD.


    30 Sep 15 at 9:08 pm

  30. Graham, I have that problem on one Win 10 laptop, but not on another one with the insider preview . . .


    29 Feb 16 at 3:53 am

  31. Hi again. It seems that the setup.bat has problems installing headlessly. If no user is logged in, then this bit: “run32dll.exe setupapi.dll, …” Does nothing. The cmd returns no output. We notice that it fails to register any windows service. So the next line ‘net start ext2fsd’ fails. So if we could fix that somehow. Sorry it’s beyond my own knowledge. Another good thing would be to make a chocolatey pkg for it. Again for better headless install on windows.


    20 Oct 15 at 5:26 pm

  32. Does this version work with Windows Server 2012 r2?


    27 Oct 15 at 2:17 pm

  33. Hi, after upgrading to win10 threshold 2, the mounted ext4 disk doesn’t show and cannot be accessed. What could be wrong?


    14 Nov 15 at 10:11 am

  34. Same problem here


    17 Nov 15 at 5:07 am

  35. Same here too 🙁


    22 Nov 15 at 11:35 pm

  36. same here.. 🙁


    23 Nov 15 at 1:42 am

  37. Windows 10 TH2 creates the drive letter in different session space (session 0), different to desktop/Explorer session.

    Here’s temporary solution:
    1, Download Ext2Mount from http://ext2fsd.com/dynox.cn/soft/Ext2Mount.zip
    2, Run Ext2mgr (Ext2 Volume Manager) to get the device name of your EXT volume
    3, Start Windows cmd or (WIN key)+r, then execute \your_path\Ext2Mount mount \device\….


    26 Nov 15 at 5:41 pm

  38. Me fifth. Playing around with mounting options doesnt help either. The drive never shows up in Windows Explorer and is also not accessible via CMD. The strange thing is that I does show up in Total Commander and is also accessible via that program (I think only using DefineDosDevice mounting).


    23 Nov 15 at 8:17 pm

  39. It seems DefineDosDevice is somehow broken in Threshold 2

    Update Windows at your peril as they now seem to think major changes can be made anytime rather than when a new OS version is released.

    I’ve had exactly the same problem in my DriveCrypt 5 software, now updated. DefineDosDevice is returning Error 6 “The handle is invalid” from GetLastError

    It seems that this might only a problem when DefineDosDevice is called from SYSTEM rather than user program, but SYSTEM is needed to create the link in Global namespace.

    If you are using a kernel mode driver, then update the code to connect the device via a kernel mode call to IoSetSymbolicLink in the Global?? namespace which will work.

    shaun Hollingworth

    23 Nov 15 at 11:08 pm

  40. PS: Sorry It’s IoCreateSymbolicLink !!

    shaun Hollingworth

    25 Nov 15 at 8:15 pm

  41. I’m sorry, is there anything a beginner can do to make it work on the newest Windows 10? Apart from waiting for an EXT2FSD update of course 😉


    26 Nov 15 at 3:25 pm

  42. Sorry, Not really.

    It needs the API fixing, or mod to the kernel mode driver, to do the thing that DefineDosDevice does, and that is to create a symbolic link to the EXT2FD drive letter

    You could complain to Microsoft however and ask them why this has happened.

    Shaun Hollingworth

    2 Dec 15 at 5:46 pm

  43. I am sure Bill will be right on it 🙂

    I also tried Paragon ExtFS for Windows. That one does mount the drive in Win 10 TH2 properly, but as soon as you try to copy/ome files then it freezes. Ext2Fsd does the oposite thing; it worksbut doesn’t mount in Win 10 TH2 itself. So hopefully it will work one day


    3 Dec 15 at 1:47 am

  44. i know you are not listing Win 10 64bit as supported – any plans to support it in the future?


    11 Jan 16 at 8:51 pm

  45. I’m using this to recover files from a linux hdd using Win 10. Its’ working fine except that it can’t do anything with files that have special/foreign characters in the file name. Is that something that can be addressed, or is it a known limitation?


    29 Feb 16 at 3:49 am

  46. When I start the service in Windows 10, I immediately get the blue screen of death.


    29 Feb 16 at 4:16 pm

  47. Please share the memory dump from C:\WINDOWS\Minidump so can we help analyze it.

    Bo Brantén

    7 Mar 16 at 1:10 am

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