NTFSTRUNCATE(8) System Manager's Manual NTFSTRUNCATE(8)

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.

This will override some sensible defaults, such as not using a mounted volume. Use this option with caution.
Show a list of options with a brief description of each one.
Display licensing information.
Simulate the truncation without actually write to device.
Suppress some debug/warning/error messages.
Display more debug/warning/error messages.
Show the version number, copyright and license of ntfstruncate.
Define a particular attribute type to be truncated (advanced use only). By default, the unnamed $DATA attribute (the contents of a plain file) will be truncated. The attribute has to be specified by a number in decimal or hexadecimal :
Hex Decimal Name
0x30 48 "$FILE_NAME"
0x40 64 "$OBJECT_ID"
0x60 96 "$VOLUME_NAME"
0x80 128 "$DATA"
0x90 144 "$INDEX_ROOT"
0xB0 176 "$BITMAP"
0xE0 224 "$EA"
0xF0 240 "$PROPERTY_SET"
Define the name of the particular attribute type to be truncated (advanced use only).
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.

ntfstruncate /dev/sda1 Data/database.db 100M

There are no known problems with ntfstruncate. If you find a bug, please send an email describing the problem to the development team:

ntfstruncate was written by Anton Altaparmakov.

ntfstruncate is part of the ntfs-3g package and is available from:

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

June 2014 ntfs-3g 2022.10.3