Section: Maintenance Commands (8)
Updated: July 2013
ntfsresize - resize an NTFS filesystem without data loss
program safely resizes Windows XP, Windows Server 2003, Windows 2000, Windows
NT4 and Longhorn NTFS filesystems without data loss. All NTFS versions are
supported, used by 32-bit and 64-bit Windows.
Defragmentation is NOT required prior to resizing
because the program can relocate any data if needed, without risking data
Ntfsresize can be used to shrink or enlarge any NTFS filesystem located
on an unmounted
(usually a disk partition). The new filesystem will fit in a DEVICE
whose desired size is
parameter may have one of the optional modifiers
which means the
parameter is given in kilo-, mega- or gigabytes respectively.
conforms to the SI, ATA, IEEE standards and the disk manufacturers
by using k=10^3, M=10^6 and G=10^9.
are omitted then the
NTFS filesystem will be enlarged to match the underlying
To resize a filesystem on a partition, you must resize BOTH the filesystem
and the partition by editing the partition table on the disk. Similarly to
other command line filesystem resizers,
doesn't manipulate the size of the partitions, hence
to do that you must use a disk partitioning tool as well, for example
Alternatively you could use one of the many user friendly partitioners that
internally, like Mandriva's DiskDrake, QTParted, SUSE/Novell's YaST Partitioner,
IBM's EVMS, GParted or Debian/Ubuntu's Partman.
It's a good practice making REGULAR BACKUPS of your valuable data, especially
before using ANY partitioning tools. To do so for NTFS, you could use
Don't forget to save the partition table as well!
If you wish to shrink an NTFS partition, first use
to shrink the size of the filesystem. Then you could use
to shrink the size of the partition by deleting the
partition and recreating it with the smaller size.
Do not make the partition smaller than the new size of
NTFS otherwise you won't be able to boot. If you did so notwithstanding
then just recreate the partition to be as large as NTFS.
To enlarge an NTFS filesystem, first you must enlarge the size of the
underlying partition. This can be done using
by deleting the partition and recreating it with a larger size.
Make sure it will not overlap with another existing partition.
You may enlarge upwards (first sector unchanged) or downwards (last
sector unchanged), but you may not enlarge at both ends in a single step.
If you merge two NTFS partitions, only one of them can be expanded to the
After you have enlarged the partition, you may use
to enlarge the size of the filesystem.
When recreating the partition by a disk partitioning tool,
make sure you create it at the same
starting sector and with the same partition type as before.
Otherwise you won't be able to access your filesystem. Use the 'u'
fdisk command to switch to the reliable sector unit from the
default cylinder one.
Also make sure you set the bootable flag for the partition if it
existed before. Failing to do so you might not be able to boot your
computer from the disk.
Below is a summary of all the options that
accepts. Nearly all options have two equivalent names. The short name is
and the long name is preceded by
Any single letter options, that don't take an argument, can be combined into a
single command, e.g.
is equivalent to
Long named options can be abbreviated to any unique prefix of their name.
- -c, --check
By using this option ntfsresize will only check the device to ensure that it
is ready to be resized. If not, it will print any errors detected.
If the device is fine, nothing will be printed.
- -i, --info
By using this option without --expand, ntfsresize will determine the
theoretically smallest shrunken filesystem size supported.
Most of the time the result is the space
already used on the filesystem. Ntfsresize will refuse shrinking to a
smaller size than what you got by this option and depending on several
factors it might be unable to shrink very close to this theoretical
size. Although the integrity of your data should be never in risk,
it's still strongly recommended to make a test run by using the
--no-action option before real resizing.
Practically the smallest shrunken size generally is
at around "used space" + (20-200 MB). Please also take into account
that Windows might need about 50-100 MB free space left to boot safely.
If used in association with option --expand, ntfsresize will determine
the smallest downwards expansion size and the possible increments to the
size. These are exact byte counts which must not be rounded.
This option may be used after the partition has been expanded
provided the upper bound has not been changed.
This option never causes any changes to the filesystem, the partition is
- -m, --info-mb-only
Like the info option, only print out the shrinkable size in MB. Print nothing
if the shrink size is the same as the original size (in MB).
This option cannot be used in association with option --expand.
- -s, --size SIZE[k|M|G]
Resize filesystem to fit in a partition whose size is
SIZE[k|M|G] bytes by shifting its end and keeping
its beginning unchanged. The filesystem size is set to be at least one
sector smaller than the partition.
The optional modifiers
parameter is given in kilo-, mega- or gigabytes respectively.
Conforming to standards, k=10^3, M=10^6 and G=10^9. ki=2^10, Mi=2^20
and Gi=2^30 are also allowed. Use this option
- -x, --expand
Expand the filesystem to the current partition size, shifting down its
beginning and keeping its end unchanged. The metadata is recreated in the
expanded space and no user data is relocated. This is incompatible with
option -s (or --size) and can only be made if the expanded space is an
exact multiple of the cluster size. It must also be large enough to hold the
If the expansion is interrupted for some reason (power outage, etc), you may
restart the resizing, as the original data and metadata have been kept
Note : expanding a Windows system partition and filesystem downwards may lead
to the registry or some files not matching the new system layout, or to
some important files being located too far from the beginning of the
partition, thus making Windows not bootable.
- -f, --force
Forces ntfsresize to proceed with the resize operation either without
prompting for an explicit acceptance, or if the filesystem is marked for
consistency check. Double the option (-ff, --force --force) to avoid
prompting even if the file system is marked for check.
Please note, ntfsresize always marks the filesystem
for consistency check before a real resize operation
and it leaves that way for extra
safety. Thus if NTFS was marked by ntfsresize then it's safe to
use this option. If you need
to resize several times without booting into Windows between each
resizing steps then you must use this option.
- -n, --no-action
Use this option to make a test run before doing the real resize operation.
Volume will be opened read-only and
displays what it would do if it were to resize the filesystem.
Continue with the real resizing only if the test run passed.
- -b, --bad-sectors
Support disks having hardware errors, bad sectors with those
would refuse to work by default.
Prior using this option, it's strongly recommended to make a backup by
using the --rescue option, then running 'chkdsk /f /r volume:' on Windows
from the command line. If the disk guarantee is still valid then replace it.
It's defected. Please also note, that no software can repair these type of
hardware errors. The most what they can do is to work around the permanent
This option doesn't have any effect if the disk is flawless.
- -P, --no-progress-bar
Don't show progress bars.
- -v, --verbose
- -V, --version
Print the version number of
- -h, --help
Display help and exit.
The exit code is 0 on success, non-zero otherwise.
No reliability problem is known. If you need
help please try the Ntfsresize FAQ first (see below) and if you
don't find your answer then send your question, comment or bug report to
the development team:
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.
schedules an NTFS consistency check and
after the first boot into Windows you must see
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.
The disk geometry handling semantic (HDIO_GETGEO ioctl) has changed
in an incompatible way in Linux 2.6 kernels and this triggered multitudinous
partition table corruptions resulting in unbootable Windows systems, even if
NTFS was consistent, if
was involved in some way. This problem was often attributed to ntfsresize
but in fact it's completely independent of NTFS thus ntfsresize. Moreover
ntfsresize never touches the partition table at all. By changing
the 'Disk Access Mode' to LBA in the BIOS makes booting work
again, most of the time. You can find more information about this issue
in the Troubleshooting section of the below referred Ntfsresize FAQ.
was written by Szabolcs Szakacsits, with contributions from Anton Altaparmakov
and Richard Russon.
It was ported to ntfs-3g by Erik Larsson and Jean-Pierre Andre.
Many thanks to Anton Altaparmakov and Richard Russon
for libntfs, the excellent documentation and comments,
to Gergely Madarasz, Dewey M. Sasser and Miguel Lastra and his colleagues
at the University of Granada for their continuous and highly valuable help,
furthermore to Erik Meade, Martin Fick, Sandro Hawke, Dave Croal,
Lorrin Nelson, Geert Hendrickx, Robert Bjorkman and Richard Burdick
for beta testing the relocation support, to Florian Eyben, Fritz Oppliger,
Richard Ebling, Sid-Ahmed Touati, Jan Kiszka, Benjamin Redelings, Christopher
Haney, Ryan Durk, Ralf Beyer, Scott Hansen, Alan Evans for the valued
contributions and to Theodore Ts'o whose
man page originally formed the basis of this page.
is part of the
package and is available from:
related news, example of usage, troubleshooting, statically linked binary and
FAQ (frequently asked questions) are maintained at: