Copyright (c) 2014 Jean-Pierre Andre
This file may be copied under the terms of the GNU Public License.

ntfstruncate - truncate a file on an NTFS volume ntfstruncate [options] device file [attr-type [attr-name]] new-length ntfstruncate truncates (or extends) a specified attribute belonging to a file or directory, to a specified length. Below is a summary of all the options that ntfstruncate accepts. Nearly all options have two equivalent names. The short name is preceded by - 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. -fv is equivalent to "-f -v" . Long named options can be abbreviated to any unique prefix of their name.

-f, --force This will override some sensible defaults, such as not using a mounted volume. Use this option with caution.

-h, --help Show a list of options with a brief description of each one.

-l Display licensing information.

-n, --no-action Simulate the truncation without actually write to device.

-q, --quiet Suppress some debug/warning/error messages.

-v, --verbose Display more debug/warning/error messages.

-V, --version Show the version number, copyright and license of ntfstruncate .

attr-type Define a particular attribute type to be truncated (advanced use only). By default, the unnamed $DATA attribute (the contents of a plain file) will be truncated. The attribute has to be specified by a number in decimal or hexadecimal :

Hex Decimal Name

0x10 16 "$STANDARD_INFORMATION"

0x20 32 "$ATTRIBUTE_LIST"

0x30 48 "$FILE_NAME"

0x40 64 "$OBJECT_ID"

0x50 80 "$SECURITY_DESCRIPTOR"

0x60 96 "$VOLUME_NAME"

0x70 112 "$VOLUME_INFORMATION"

0x80 128 "$DATA"

0x90 144 "$INDEX_ROOT"

0xA0 160 "$INDEX_ALLOCATION"

0xB0 176 "$BITMAP"

0xC0 192 "$REPARSE_POINT"

0xD0 208 "$EA_INFORMATION"

0xE0 224 "$EA"

0xF0 240 "$PROPERTY_SET"

0x100 256 "$LOGGED_UTILITY_STREAM"

attr-name Define the name of the particular attribute type to be truncated (advanced use only).

new-length Specify the target size of the file. It will be rounded up to a multiple of the cluster size. A suffix of K, M, G, T, P or E may be appended to mean a multiplicative factor of a power of 1000. Similarly a suffix of Ki, Mi, Gi, Ti, Pi or Ei may be appended to mean a multiplicative factor of a power of 1024.

Resize to 100MB the file database.db located in the Data directory which is at the root of an NTFS file system. There are no known problems with ntfstruncate . If you find a bug, please send an email describing the problem to the development team:

ntfs-3g-devel@lists.sf.net

ntfstruncate was written by Anton Altaparmakov. ntfstruncate is part of the ntfs-3g package and is available from:

https://github.com/tuxera/ntfs-3g/wiki/

ntfs-3g (8), ntfsfallocate (8), ntfsprogs (8).