gparted corrupts when shrinking ntfs

[John Reiser]

When I use Fedora 25 Workstation Live plus gparted to shrink an ntfs partition,
then the result is corrupt.  This is reproducible on a minimal install
of Windows 10 build 1510 (a raw system image dump fits on 2 DVD),
such as commonly available on inexpensive refurbished PCs.  Running CHKDSK
immediately afterward detects and fixes the corruption for me.
Where/how should I start to investigate: which software component, etc.?

[Richard W.M. Jones]

On Mon, Apr 03, 2017 at 09:26:37PM -0700, John Reiser wrote:
>  When I use Fedora 25 Workstation Live plus gparted to shrink an ntfs
> partition,
>  then the result is corrupt.  This is reproducible on a minimal install
>  of Windows 10 build 1510 (a raw system image dump fits on 2 DVD),
>  such as commonly available on inexpensive refurbished PCs.  Running CHKDSK
>  immediately afterward detects and fixes the corruption for me.
>  Where/how should I start to investigate: which software component, etc.? 
gparted uses ntfsresize to resize NTFS partitions.  That comes
from the ntfs-3g project, so that's where you should start.

http://www.tuxera.com/community/open-source-ntfs-3g/

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

[Björn 'besser82' Esser]

Am 04.04.2017 um 09:50 schrieb Richard W.M. Jones:
>  On Mon, Apr 03, 2017 at 09:26:37PM -0700, John Reiser wrote:
> > When I use Fedora 25 Workstation Live plus gparted to shrink an ntfs partition,
> > then the result is corrupt.  This is reproducible on a minimal install
> > of Windows 10 build 1510 (a raw system image dump fits on 2 DVD),
> > such as commonly available on inexpensive refurbished PCs.  Running CHKDSK
> > immediately afterward detects and fixes the corruption for me.
> > Where/how should I start to investigate: which software component, etc.?
>  gparted uses ntfsresize to resize NTFS partitions.  That comes
>  from the ntfs-3g project, so that's where you should start.
>
>  http://www.tuxera.com/community/open-source-ntfs-3g/
>
>  Rich.
>  
Quoted from NTFSRESIZE(8) manual-page `man ntfsresize`:

>  KNOWN ISSUES
>         No reliability problem is known. …snip… 
>         There are a few very rarely met restrictions at present: 
filesystems having unknown bad sectors,  relocation of  the first MFT 
extent and resizing into the middle of a $MFTMirr extent aren't 
supported yet. These cases are detected and resizing is restricted to a 
safe size or the closest safe size is displayed.
>         Ntfsresize schedules an NTFS consistency check and after the 
first boot into Windows  you  must  see  chkdsk running  on a blue 
background. This is intentional and no need to worry about it. Windows 
may force a quick reboot after the consistency check. Moreover after 
repartitioning your disk and depending on  the hardware configuration,  
the  Windows  message System Settings Change may also appear. Just 
acknowledge it and reboot again.

NTFSresize sets the NFTS' dirty-flag on the resized partition after 
operation, that's why Windows consideres it corrupted and performs 
checks on it.  There is no need to worry about that.

Cheers
   Björn